chore: make deps, go mod vendor

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/common.go

@@ -18,20 +18,6 @@ const (
 	WriteErrorKey = attribute.Key("http.write_error") // if an error occurred while writing a reply, the string of the error (io.EOF is not recorded)
 )
 
-// Server HTTP metrics.
-const (
-	serverRequestSize  = "http.server.request.size"  // Incoming request bytes total
-	serverResponseSize = "http.server.response.size" // Incoming response bytes total
-	serverDuration     = "http.server.duration"      // Incoming end to end duration, milliseconds
-)
-
-// Client HTTP metrics.
-const (
-	clientRequestSize  = "http.client.request.size"  // Outgoing request bytes total
-	clientResponseSize = "http.client.response.size" // Outgoing response bytes total
-	clientDuration     = "http.client.duration"      // Outgoing end to end duration, milliseconds
-)
-
 // Filter is a predicate used to determine whether a given http.request should
 // be traced. A Filter must return true if the request should be traced.
 type Filter func(*http.Request) bool

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/config.go

@@ -8,6 +8,8 @@ import (
 	"net/http"
 	"net/http/httptrace"
 
+	"go.opentelemetry.io/otel/attribute"
+
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/propagation"
@@ -33,8 +35,9 @@ type config struct {
 	SpanNameFormatter func(string, *http.Request) string
 	ClientTrace       func(context.Context) *httptrace.ClientTrace
 
-	TracerProvider trace.TracerProvider
-	MeterProvider  metric.MeterProvider
+	TracerProvider     trace.TracerProvider
+	MeterProvider      metric.MeterProvider
+	MetricAttributesFn func(*http.Request) []attribute.KeyValue
 }
 
 // Option interface used for setting optional config properties.
@@ -194,3 +197,11 @@ func WithServerName(server string) Option {
 		c.ServerName = server
 	})
 }
+
+// WithMetricAttributesFn returns an Option to set a function that maps an HTTP request to a slice of attribute.KeyValue.
+// These attributes will be included in metrics for every request.
+func WithMetricAttributesFn(metricAttributesFn func(r *http.Request) []attribute.KeyValue) Option {
+	return optionFunc(func(c *config) {
+		c.MetricAttributesFn = metricAttributesFn
+	})
+}

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/handler.go

@@ -9,11 +9,9 @@ import (
 
 	"github.com/felixge/httpsnoop"
 
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/request"
 	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv"
-	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconvutil"
 	"go.opentelemetry.io/otel"
-	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/trace"
 )
@@ -24,7 +22,6 @@ type middleware struct {
 	server    string
 
 	tracer            trace.Tracer
-	meter             metric.Meter
 	propagators       propagation.TextMapPropagator
 	spanStartOptions  []trace.SpanStartOption
 	readEvent         bool
@@ -34,10 +31,7 @@ type middleware struct {
 	publicEndpoint    bool
 	publicEndpointFn  func(*http.Request) bool
 
-	traceSemconv         semconv.HTTPServer
-	requestBytesCounter  metric.Int64Counter
-	responseBytesCounter metric.Int64Counter
-	serverLatencyMeasure metric.Float64Histogram
+	semconv semconv.HTTPServer
 }
 
 func defaultHandlerFormatter(operation string, _ *http.Request) string {
@@ -56,8 +50,6 @@ func NewHandler(handler http.Handler, operation string, opts ...Option) http.Han
 func NewMiddleware(operation string, opts ...Option) func(http.Handler) http.Handler {
 	h := middleware{
 		operation: operation,
-
-		traceSemconv: semconv.NewHTTPServer(),
 	}
 
 	defaultOpts := []Option{
@@ -67,7 +59,6 @@ func NewMiddleware(operation string, opts ...Option) func(http.Handler) http.Han
 
 	c := newConfig(append(defaultOpts, opts...)...)
 	h.configure(c)
-	h.createMeasures()
 
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
@@ -78,7 +69,6 @@ func NewMiddleware(operation string, opts ...Option) func(http.Handler) http.Han
 
 func (h *middleware) configure(c *config) {
 	h.tracer = c.Tracer
-	h.meter = c.Meter
 	h.propagators = c.Propagators
 	h.spanStartOptions = c.SpanStartOptions
 	h.readEvent = c.ReadEvent
@@ -88,36 +78,7 @@ func (h *middleware) configure(c *config) {
 	h.publicEndpoint = c.PublicEndpoint
 	h.publicEndpointFn = c.PublicEndpointFn
 	h.server = c.ServerName
-}
-
-func handleErr(err error) {
-	if err != nil {
-		otel.Handle(err)
-	}
-}
-
-func (h *middleware) createMeasures() {
-	var err error
-	h.requestBytesCounter, err = h.meter.Int64Counter(
-		serverRequestSize,
-		metric.WithUnit("By"),
-		metric.WithDescription("Measures the size of HTTP request messages."),
-	)
-	handleErr(err)
-
-	h.responseBytesCounter, err = h.meter.Int64Counter(
-		serverResponseSize,
-		metric.WithUnit("By"),
-		metric.WithDescription("Measures the size of HTTP response messages."),
-	)
-	handleErr(err)
-
-	h.serverLatencyMeasure, err = h.meter.Float64Histogram(
-		serverDuration,
-		metric.WithUnit("ms"),
-		metric.WithDescription("Measures the duration of inbound HTTP requests."),
-	)
-	handleErr(err)
+	h.semconv = semconv.NewHTTPServer(c.Meter)
 }
 
 // serveHTTP sets up tracing and calls the given next http.Handler with the span
@@ -134,7 +95,7 @@ func (h *middleware) serveHTTP(w http.ResponseWriter, r *http.Request, next http
 
 	ctx := h.propagators.Extract(r.Context(), propagation.HeaderCarrier(r.Header))
 	opts := []trace.SpanStartOption{
-		trace.WithAttributes(h.traceSemconv.RequestTraceAttrs(h.server, r)...),
+		trace.WithAttributes(h.semconv.RequestTraceAttrs(h.server, r)...),
 	}
 
 	opts = append(opts, h.spanStartOptions...)
@@ -156,6 +117,11 @@ func (h *middleware) serveHTTP(w http.ResponseWriter, r *http.Request, next http
 		}
 	}
 
+	if startTime := StartTimeFromContext(ctx); !startTime.IsZero() {
+		opts = append(opts, trace.WithTimestamp(startTime))
+		requestStartTime = startTime
+	}
+
 	ctx, span := tracer.Start(ctx, h.spanNameFormatter(h.operation, r), opts...)
 	defer span.End()
 
@@ -166,14 +132,12 @@ func (h *middleware) serveHTTP(w http.ResponseWriter, r *http.Request, next http
 		}
 	}
 
-	var bw bodyWrapper
 	// if request body is nil or NoBody, we don't want to mutate the body as it
 	// will affect the identity of it in an unforeseeable way because we assert
 	// ReadCloser fulfills a certain interface and it is indeed nil or NoBody.
+	bw := request.NewBodyWrapper(r.Body, readRecordFunc)
 	if r.Body != nil && r.Body != http.NoBody {
-		bw.ReadCloser = r.Body
-		bw.record = readRecordFunc
-		r.Body = &bw
+		r.Body = bw
 	}
 
 	writeRecordFunc := func(int64) {}
@@ -183,13 +147,7 @@ func (h *middleware) serveHTTP(w http.ResponseWriter, r *http.Request, next http
 		}
 	}
 
-	rww := &respWriterWrapper{
-		ResponseWriter: w,
-		record:         writeRecordFunc,
-		ctx:            ctx,
-		props:          h.propagators,
-		statusCode:     http.StatusOK, // default status code in case the Handler doesn't write anything
-	}
+	rww := request.NewRespWriterWrapper(w, writeRecordFunc)
 
 	// Wrap w to use our ResponseWriter methods while also exposing
 	// other interfaces that w may implement (http.CloseNotifier,
@@ -217,35 +175,39 @@ func (h *middleware) serveHTTP(w http.ResponseWriter, r *http.Request, next http
 
 	next.ServeHTTP(w, r.WithContext(ctx))
 
-	span.SetStatus(semconv.ServerStatus(rww.statusCode))
-	span.SetAttributes(h.traceSemconv.ResponseTraceAttrs(semconv.ResponseTelemetry{
-		StatusCode: rww.statusCode,
-		ReadBytes:  bw.read.Load(),
-		ReadError:  bw.err,
-		WriteBytes: rww.written,
-		WriteError: rww.err,
+	statusCode := rww.StatusCode()
+	bytesWritten := rww.BytesWritten()
+	span.SetStatus(h.semconv.Status(statusCode))
+	span.SetAttributes(h.semconv.ResponseTraceAttrs(semconv.ResponseTelemetry{
+		StatusCode: statusCode,
+		ReadBytes:  bw.BytesRead(),
+		ReadError:  bw.Error(),
+		WriteBytes: bytesWritten,
+		WriteError: rww.Error(),
 	})...)
 
-	// Add metrics
-	attributes := append(labeler.Get(), semconvutil.HTTPServerRequestMetrics(h.server, r)...)
-	if rww.statusCode > 0 {
-		attributes = append(attributes, semconv.HTTPStatusCode(rww.statusCode))
-	}
-	o := metric.WithAttributeSet(attribute.NewSet(attributes...))
-	addOpts := []metric.AddOption{o} // Allocate vararg slice once.
-	h.requestBytesCounter.Add(ctx, bw.read.Load(), addOpts...)
-	h.responseBytesCounter.Add(ctx, rww.written, addOpts...)
-
 	// Use floating point division here for higher precision (instead of Millisecond method).
 	elapsedTime := float64(time.Since(requestStartTime)) / float64(time.Millisecond)
 
-	h.serverLatencyMeasure.Record(ctx, elapsedTime, o)
+	h.semconv.RecordMetrics(ctx, semconv.ServerMetricData{
+		ServerName:   h.server,
+		ResponseSize: bytesWritten,
+		MetricAttributes: semconv.MetricAttributes{
+			Req:                  r,
+			StatusCode:           statusCode,
+			AdditionalAttributes: labeler.Get(),
+		},
+		MetricData: semconv.MetricData{
+			RequestSize: bw.BytesRead(),
+			ElapsedTime: elapsedTime,
+		},
+	})
 }
 
 // WithRouteTag annotates spans and metrics with the provided route name
 // with HTTP route attribute.
 func WithRouteTag(route string, h http.Handler) http.Handler {
-	attr := semconv.NewHTTPServer().Route(route)
+	attr := semconv.NewHTTPServer(nil).Route(route)
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		span := trace.SpanFromContext(r.Context())
 		span.SetAttributes(attr)

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/request/body_wrapper.go

@@ -0,0 +1,75 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package request // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/request"
+
+import (
+	"io"
+	"sync"
+)
+
+var _ io.ReadCloser = &BodyWrapper{}
+
+// BodyWrapper wraps a http.Request.Body (an io.ReadCloser) to track the number
+// of bytes read and the last error.
+type BodyWrapper struct {
+	io.ReadCloser
+	OnRead func(n int64) // must not be nil
+
+	mu   sync.Mutex
+	read int64
+	err  error
+}
+
+// NewBodyWrapper creates a new BodyWrapper.
+//
+// The onRead attribute is a callback that will be called every time the data
+// is read, with the number of bytes being read.
+func NewBodyWrapper(body io.ReadCloser, onRead func(int64)) *BodyWrapper {
+	return &BodyWrapper{
+		ReadCloser: body,
+		OnRead:     onRead,
+	}
+}
+
+// Read reads the data from the io.ReadCloser, and stores the number of bytes
+// read and the error.
+func (w *BodyWrapper) Read(b []byte) (int, error) {
+	n, err := w.ReadCloser.Read(b)
+	n1 := int64(n)
+
+	w.updateReadData(n1, err)
+	w.OnRead(n1)
+	return n, err
+}
+
+func (w *BodyWrapper) updateReadData(n int64, err error) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	w.read += n
+	if err != nil {
+		w.err = err
+	}
+}
+
+// Closes closes the io.ReadCloser.
+func (w *BodyWrapper) Close() error {
+	return w.ReadCloser.Close()
+}
+
+// BytesRead returns the number of bytes read up to this point.
+func (w *BodyWrapper) BytesRead() int64 {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	return w.read
+}
+
+// Error returns the last error.
+func (w *BodyWrapper) Error() error {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	return w.err
+}

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/request/resp_writer_wrapper.go

@@ -0,0 +1,119 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package request // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/request"
+
+import (
+	"net/http"
+	"sync"
+)
+
+var _ http.ResponseWriter = &RespWriterWrapper{}
+
+// RespWriterWrapper wraps a http.ResponseWriter in order to track the number of
+// bytes written, the last error, and to catch the first written statusCode.
+// TODO: The wrapped http.ResponseWriter doesn't implement any of the optional
+// types (http.Hijacker, http.Pusher, http.CloseNotifier, etc)
+// that may be useful when using it in real life situations.
+type RespWriterWrapper struct {
+	http.ResponseWriter
+	OnWrite func(n int64) // must not be nil
+
+	mu          sync.RWMutex
+	written     int64
+	statusCode  int
+	err         error
+	wroteHeader bool
+}
+
+// NewRespWriterWrapper creates a new RespWriterWrapper.
+//
+// The onWrite attribute is a callback that will be called every time the data
+// is written, with the number of bytes that were written.
+func NewRespWriterWrapper(w http.ResponseWriter, onWrite func(int64)) *RespWriterWrapper {
+	return &RespWriterWrapper{
+		ResponseWriter: w,
+		OnWrite:        onWrite,
+		statusCode:     http.StatusOK, // default status code in case the Handler doesn't write anything
+	}
+}
+
+// Write writes the bytes array into the [ResponseWriter], and tracks the
+// number of bytes written and last error.
+func (w *RespWriterWrapper) Write(p []byte) (int, error) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if !w.wroteHeader {
+		w.writeHeader(http.StatusOK)
+	}
+
+	n, err := w.ResponseWriter.Write(p)
+	n1 := int64(n)
+	w.OnWrite(n1)
+	w.written += n1
+	w.err = err
+	return n, err
+}
+
+// WriteHeader persists initial statusCode for span attribution.
+// All calls to WriteHeader will be propagated to the underlying ResponseWriter
+// and will persist the statusCode from the first call.
+// Blocking consecutive calls to WriteHeader alters expected behavior and will
+// remove warning logs from net/http where developers will notice incorrect handler implementations.
+func (w *RespWriterWrapper) WriteHeader(statusCode int) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	w.writeHeader(statusCode)
+}
+
+// writeHeader persists the status code for span attribution, and propagates
+// the call to the underlying ResponseWriter.
+// It does not acquire a lock, and therefore assumes that is being handled by a
+// parent method.
+func (w *RespWriterWrapper) writeHeader(statusCode int) {
+	if !w.wroteHeader {
+		w.wroteHeader = true
+		w.statusCode = statusCode
+	}
+	w.ResponseWriter.WriteHeader(statusCode)
+}
+
+// Flush implements [http.Flusher].
+func (w *RespWriterWrapper) Flush() {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if !w.wroteHeader {
+		w.writeHeader(http.StatusOK)
+	}
+
+	if f, ok := w.ResponseWriter.(http.Flusher); ok {
+		f.Flush()
+	}
+}
+
+// BytesWritten returns the number of bytes written.
+func (w *RespWriterWrapper) BytesWritten() int64 {
+	w.mu.RLock()
+	defer w.mu.RUnlock()
+
+	return w.written
+}
+
+// BytesWritten returns the HTTP status code that was sent.
+func (w *RespWriterWrapper) StatusCode() int {
+	w.mu.RLock()
+	defer w.mu.RUnlock()
+
+	return w.statusCode
+}
+
+// Error returns the last error.
+func (w *RespWriterWrapper) Error() error {
+	w.mu.RLock()
+	defer w.mu.RUnlock()
+
+	return w.err
+}

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv/env.go

@@ -4,6 +4,7 @@
 package semconv // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv"
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 	"os"
@@ -11,6 +12,7 @@ import (
 
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/codes"
+	"go.opentelemetry.io/otel/metric"
 )
 
 type ResponseTelemetry struct {
@@ -23,6 +25,11 @@ type ResponseTelemetry struct {
 
 type HTTPServer struct {
 	duplicate bool
+
+	// Old metrics
+	requestBytesCounter  metric.Int64Counter
+	responseBytesCounter metric.Int64Counter
+	serverLatencyMeasure metric.Float64Histogram
 }
 
 // RequestTraceAttrs returns trace attributes for an HTTP request received by a
@@ -63,15 +70,10 @@ func (s HTTPServer) Route(route string) attribute.KeyValue {
 	return oldHTTPServer{}.Route(route)
 }
 
-func NewHTTPServer() HTTPServer {
-	env := strings.ToLower(os.Getenv("OTEL_HTTP_CLIENT_COMPATIBILITY_MODE"))
-	return HTTPServer{duplicate: env == "http/dup"}
-}
-
-// ServerStatus returns a span status code and message for an HTTP status code
+// Status returns a span status code and message for an HTTP status code
 // value returned by a server. Status codes in the 400-499 range are not
 // returned as errors.
-func ServerStatus(code int) (codes.Code, string) {
+func (s HTTPServer) Status(code int) (codes.Code, string) {
 	if code < 100 || code >= 600 {
 		return codes.Error, fmt.Sprintf("Invalid HTTP status code %d", code)
 	}
@@ -80,3 +82,146 @@ func ServerStatus(code int) (codes.Code, string) {
 	}
 	return codes.Unset, ""
 }
+
+type ServerMetricData struct {
+	ServerName   string
+	ResponseSize int64
+
+	MetricData
+	MetricAttributes
+}
+
+type MetricAttributes struct {
+	Req                  *http.Request
+	StatusCode           int
+	AdditionalAttributes []attribute.KeyValue
+}
+
+type MetricData struct {
+	RequestSize int64
+	ElapsedTime float64
+}
+
+func (s HTTPServer) RecordMetrics(ctx context.Context, md ServerMetricData) {
+	if s.requestBytesCounter == nil || s.responseBytesCounter == nil || s.serverLatencyMeasure == nil {
+		// This will happen if an HTTPServer{} is used insted of NewHTTPServer.
+		return
+	}
+
+	attributes := oldHTTPServer{}.MetricAttributes(md.ServerName, md.Req, md.StatusCode, md.AdditionalAttributes)
+	o := metric.WithAttributeSet(attribute.NewSet(attributes...))
+	addOpts := []metric.AddOption{o}
+	s.requestBytesCounter.Add(ctx, md.RequestSize, addOpts...)
+	s.responseBytesCounter.Add(ctx, md.ResponseSize, addOpts...)
+	s.serverLatencyMeasure.Record(ctx, md.ElapsedTime, o)
+
+	// TODO: Duplicate Metrics
+}
+
+func NewHTTPServer(meter metric.Meter) HTTPServer {
+	env := strings.ToLower(os.Getenv("OTEL_SEMCONV_STABILITY_OPT_IN"))
+	duplicate := env == "http/dup"
+	server := HTTPServer{
+		duplicate: duplicate,
+	}
+	server.requestBytesCounter, server.responseBytesCounter, server.serverLatencyMeasure = oldHTTPServer{}.createMeasures(meter)
+	return server
+}
+
+type HTTPClient struct {
+	duplicate bool
+
+	// old metrics
+	requestBytesCounter  metric.Int64Counter
+	responseBytesCounter metric.Int64Counter
+	latencyMeasure       metric.Float64Histogram
+}
+
+func NewHTTPClient(meter metric.Meter) HTTPClient {
+	env := strings.ToLower(os.Getenv("OTEL_SEMCONV_STABILITY_OPT_IN"))
+	client := HTTPClient{
+		duplicate: env == "http/dup",
+	}
+	client.requestBytesCounter, client.responseBytesCounter, client.latencyMeasure = oldHTTPClient{}.createMeasures(meter)
+	return client
+}
+
+// RequestTraceAttrs returns attributes for an HTTP request made by a client.
+func (c HTTPClient) RequestTraceAttrs(req *http.Request) []attribute.KeyValue {
+	if c.duplicate {
+		return append(oldHTTPClient{}.RequestTraceAttrs(req), newHTTPClient{}.RequestTraceAttrs(req)...)
+	}
+	return oldHTTPClient{}.RequestTraceAttrs(req)
+}
+
+// ResponseTraceAttrs returns metric attributes for an HTTP request made by a client.
+func (c HTTPClient) ResponseTraceAttrs(resp *http.Response) []attribute.KeyValue {
+	if c.duplicate {
+		return append(oldHTTPClient{}.ResponseTraceAttrs(resp), newHTTPClient{}.ResponseTraceAttrs(resp)...)
+	}
+
+	return oldHTTPClient{}.ResponseTraceAttrs(resp)
+}
+
+func (c HTTPClient) Status(code int) (codes.Code, string) {
+	if code < 100 || code >= 600 {
+		return codes.Error, fmt.Sprintf("Invalid HTTP status code %d", code)
+	}
+	if code >= 400 {
+		return codes.Error, ""
+	}
+	return codes.Unset, ""
+}
+
+func (c HTTPClient) ErrorType(err error) attribute.KeyValue {
+	if c.duplicate {
+		return newHTTPClient{}.ErrorType(err)
+	}
+
+	return attribute.KeyValue{}
+}
+
+type MetricOpts struct {
+	measurement metric.MeasurementOption
+	addOptions  metric.AddOption
+}
+
+func (o MetricOpts) MeasurementOption() metric.MeasurementOption {
+	return o.measurement
+}
+
+func (o MetricOpts) AddOptions() metric.AddOption {
+	return o.addOptions
+}
+
+func (c HTTPClient) MetricOptions(ma MetricAttributes) MetricOpts {
+	attributes := oldHTTPClient{}.MetricAttributes(ma.Req, ma.StatusCode, ma.AdditionalAttributes)
+	// TODO: Duplicate Metrics
+	set := metric.WithAttributeSet(attribute.NewSet(attributes...))
+	return MetricOpts{
+		measurement: set,
+		addOptions:  set,
+	}
+}
+
+func (s HTTPClient) RecordMetrics(ctx context.Context, md MetricData, opts MetricOpts) {
+	if s.requestBytesCounter == nil || s.latencyMeasure == nil {
+		// This will happen if an HTTPClient{} is used insted of NewHTTPClient().
+		return
+	}
+
+	s.requestBytesCounter.Add(ctx, md.RequestSize, opts.AddOptions())
+	s.latencyMeasure.Record(ctx, md.ElapsedTime, opts.MeasurementOption())
+
+	// TODO: Duplicate Metrics
+}
+
+func (s HTTPClient) RecordResponseSize(ctx context.Context, responseData int64, opts metric.AddOption) {
+	if s.responseBytesCounter == nil {
+		// This will happen if an HTTPClient{} is used insted of NewHTTPClient().
+		return
+	}
+
+	s.responseBytesCounter.Add(ctx, responseData, opts)
+	// TODO: Duplicate Metrics
+}

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv/httpconv.go

@@ -4,11 +4,14 @@
 package semconv // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv"
 
 import (
+	"fmt"
 	"net/http"
+	"reflect"
+	"strconv"
 	"strings"
 
 	"go.opentelemetry.io/otel/attribute"
-	semconvNew "go.opentelemetry.io/otel/semconv/v1.24.0"
+	semconvNew "go.opentelemetry.io/otel/semconv/v1.26.0"
 )
 
 type newHTTPServer struct{}
@@ -195,3 +198,151 @@ func (n newHTTPServer) ResponseTraceAttrs(resp ResponseTelemetry) []attribute.Ke
 func (n newHTTPServer) Route(route string) attribute.KeyValue {
 	return semconvNew.HTTPRoute(route)
 }
+
+type newHTTPClient struct{}
+
+// RequestTraceAttrs returns trace attributes for an HTTP request made by a client.
+func (n newHTTPClient) RequestTraceAttrs(req *http.Request) []attribute.KeyValue {
+	/*
+	   below attributes are returned:
+	   - http.request.method
+	   - http.request.method.original
+	   - url.full
+	   - server.address
+	   - server.port
+	   - network.protocol.name
+	   - network.protocol.version
+	*/
+	numOfAttributes := 3 // URL, server address, proto, and method.
+
+	var urlHost string
+	if req.URL != nil {
+		urlHost = req.URL.Host
+	}
+	var requestHost string
+	var requestPort int
+	for _, hostport := range []string{urlHost, req.Header.Get("Host")} {
+		requestHost, requestPort = splitHostPort(hostport)
+		if requestHost != "" || requestPort > 0 {
+			break
+		}
+	}
+
+	eligiblePort := requiredHTTPPort(req.URL != nil && req.URL.Scheme == "https", requestPort)
+	if eligiblePort > 0 {
+		numOfAttributes++
+	}
+	useragent := req.UserAgent()
+	if useragent != "" {
+		numOfAttributes++
+	}
+
+	protoName, protoVersion := netProtocol(req.Proto)
+	if protoName != "" && protoName != "http" {
+		numOfAttributes++
+	}
+	if protoVersion != "" {
+		numOfAttributes++
+	}
+
+	method, originalMethod := n.method(req.Method)
+	if originalMethod != (attribute.KeyValue{}) {
+		numOfAttributes++
+	}
+
+	attrs := make([]attribute.KeyValue, 0, numOfAttributes)
+
+	attrs = append(attrs, method)
+	if originalMethod != (attribute.KeyValue{}) {
+		attrs = append(attrs, originalMethod)
+	}
+
+	var u string
+	if req.URL != nil {
+		// Remove any username/password info that may be in the URL.
+		userinfo := req.URL.User
+		req.URL.User = nil
+		u = req.URL.String()
+		// Restore any username/password info that was removed.
+		req.URL.User = userinfo
+	}
+	attrs = append(attrs, semconvNew.URLFull(u))
+
+	attrs = append(attrs, semconvNew.ServerAddress(requestHost))
+	if eligiblePort > 0 {
+		attrs = append(attrs, semconvNew.ServerPort(eligiblePort))
+	}
+
+	if protoName != "" && protoName != "http" {
+		attrs = append(attrs, semconvNew.NetworkProtocolName(protoName))
+	}
+	if protoVersion != "" {
+		attrs = append(attrs, semconvNew.NetworkProtocolVersion(protoVersion))
+	}
+
+	return attrs
+}
+
+// ResponseTraceAttrs returns trace attributes for an HTTP response made by a client.
+func (n newHTTPClient) ResponseTraceAttrs(resp *http.Response) []attribute.KeyValue {
+	/*
+	   below attributes are returned:
+	   - http.response.status_code
+	   - error.type
+	*/
+	var count int
+	if resp.StatusCode > 0 {
+		count++
+	}
+
+	if isErrorStatusCode(resp.StatusCode) {
+		count++
+	}
+
+	attrs := make([]attribute.KeyValue, 0, count)
+	if resp.StatusCode > 0 {
+		attrs = append(attrs, semconvNew.HTTPResponseStatusCode(resp.StatusCode))
+	}
+
+	if isErrorStatusCode(resp.StatusCode) {
+		errorType := strconv.Itoa(resp.StatusCode)
+		attrs = append(attrs, semconvNew.ErrorTypeKey.String(errorType))
+	}
+	return attrs
+}
+
+func (n newHTTPClient) ErrorType(err error) attribute.KeyValue {
+	t := reflect.TypeOf(err)
+	var value string
+	if t.PkgPath() == "" && t.Name() == "" {
+		// Likely a builtin type.
+		value = t.String()
+	} else {
+		value = fmt.Sprintf("%s.%s", t.PkgPath(), t.Name())
+	}
+
+	if value == "" {
+		return semconvNew.ErrorTypeOther
+	}
+
+	return semconvNew.ErrorTypeKey.String(value)
+}
+
+func (n newHTTPClient) method(method string) (attribute.KeyValue, attribute.KeyValue) {
+	if method == "" {
+		return semconvNew.HTTPRequestMethodGet, attribute.KeyValue{}
+	}
+	if attr, ok := methodLookup[method]; ok {
+		return attr, attribute.KeyValue{}
+	}
+
+	orig := semconvNew.HTTPRequestMethodOriginal(method)
+	if attr, ok := methodLookup[strings.ToUpper(method)]; ok {
+		return attr, orig
+	}
+	return semconvNew.HTTPRequestMethodGet, orig
+}
+
+func isErrorStatusCode(code int) bool {
+	return code >= 400 || code < 100
+}

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv/util.go

@@ -9,8 +9,9 @@ import (
 	"strconv"
 	"strings"
 
+	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
-	semconvNew "go.opentelemetry.io/otel/semconv/v1.24.0"
+	semconvNew "go.opentelemetry.io/otel/semconv/v1.26.0"
 )
 
 // splitHostPort splits a network address hostport of the form "host",
@@ -49,7 +50,7 @@ func splitHostPort(hostport string) (host string, port int) {
 	if err != nil {
 		return
 	}
-	return host, int(p)
+	return host, int(p) // nolint: gosec  // Byte size checked 16 above.
 }
 
 func requiredHTTPPort(https bool, port int) int { // nolint:revive
@@ -89,3 +90,9 @@ var methodLookup = map[string]attribute.KeyValue{
 	http.MethodPut:     semconvNew.HTTPRequestMethodPut,
 	http.MethodTrace:   semconvNew.HTTPRequestMethodTrace,
 }
+
+func handleErr(err error) {
+	if err != nil {
+		otel.Handle(err)
+	}
+}

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv/v1.20.0.go

@@ -7,9 +7,13 @@ import (
 	"errors"
 	"io"
 	"net/http"
+	"slices"
+	"strings"
 
 	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconvutil"
 	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/metric/noop"
 	semconv "go.opentelemetry.io/otel/semconv/v1.20.0"
 )
 
@@ -72,3 +76,199 @@ func (o oldHTTPServer) Route(route string) attribute.KeyValue {
 func HTTPStatusCode(status int) attribute.KeyValue {
 	return semconv.HTTPStatusCode(status)
 }
+
+// Server HTTP metrics.
+const (
+	serverRequestSize  = "http.server.request.size"  // Incoming request bytes total
+	serverResponseSize = "http.server.response.size" // Incoming response bytes total
+	serverDuration     = "http.server.duration"      // Incoming end to end duration, milliseconds
+)
+
+func (h oldHTTPServer) createMeasures(meter metric.Meter) (metric.Int64Counter, metric.Int64Counter, metric.Float64Histogram) {
+	if meter == nil {
+		return noop.Int64Counter{}, noop.Int64Counter{}, noop.Float64Histogram{}
+	}
+	var err error
+	requestBytesCounter, err := meter.Int64Counter(
+		serverRequestSize,
+		metric.WithUnit("By"),
+		metric.WithDescription("Measures the size of HTTP request messages."),
+	)
+	handleErr(err)
+
+	responseBytesCounter, err := meter.Int64Counter(
+		serverResponseSize,
+		metric.WithUnit("By"),
+		metric.WithDescription("Measures the size of HTTP response messages."),
+	)
+	handleErr(err)
+
+	serverLatencyMeasure, err := meter.Float64Histogram(
+		serverDuration,
+		metric.WithUnit("ms"),
+		metric.WithDescription("Measures the duration of inbound HTTP requests."),
+	)
+	handleErr(err)
+
+	return requestBytesCounter, responseBytesCounter, serverLatencyMeasure
+}
+
+func (o oldHTTPServer) MetricAttributes(server string, req *http.Request, statusCode int, additionalAttributes []attribute.KeyValue) []attribute.KeyValue {
+	n := len(additionalAttributes) + 3
+	var host string
+	var p int
+	if server == "" {
+		host, p = splitHostPort(req.Host)
+	} else {
+		// Prioritize the primary server name.
+		host, p = splitHostPort(server)
+		if p < 0 {
+			_, p = splitHostPort(req.Host)
+		}
+	}
+	hostPort := requiredHTTPPort(req.TLS != nil, p)
+	if hostPort > 0 {
+		n++
+	}
+	protoName, protoVersion := netProtocol(req.Proto)
+	if protoName != "" {
+		n++
+	}
+	if protoVersion != "" {
+		n++
+	}
+
+	if statusCode > 0 {
+		n++
+	}
+
+	attributes := slices.Grow(additionalAttributes, n)
+	attributes = append(attributes,
+		standardizeHTTPMethodMetric(req.Method),
+		o.scheme(req.TLS != nil),
+		semconv.NetHostName(host))
+
+	if hostPort > 0 {
+		attributes = append(attributes, semconv.NetHostPort(hostPort))
+	}
+	if protoName != "" {
+		attributes = append(attributes, semconv.NetProtocolName(protoName))
+	}
+	if protoVersion != "" {
+		attributes = append(attributes, semconv.NetProtocolVersion(protoVersion))
+	}
+
+	if statusCode > 0 {
+		attributes = append(attributes, semconv.HTTPStatusCode(statusCode))
+	}
+	return attributes
+}
+
+func (o oldHTTPServer) scheme(https bool) attribute.KeyValue { // nolint:revive
+	if https {
+		return semconv.HTTPSchemeHTTPS
+	}
+	return semconv.HTTPSchemeHTTP
+}
+
+type oldHTTPClient struct{}
+
+func (o oldHTTPClient) RequestTraceAttrs(req *http.Request) []attribute.KeyValue {
+	return semconvutil.HTTPClientRequest(req)
+}
+
+func (o oldHTTPClient) ResponseTraceAttrs(resp *http.Response) []attribute.KeyValue {
+	return semconvutil.HTTPClientResponse(resp)
+}
+
+func (o oldHTTPClient) MetricAttributes(req *http.Request, statusCode int, additionalAttributes []attribute.KeyValue) []attribute.KeyValue {
+	/* The following semantic conventions are returned if present:
+	http.method                     string
+	http.status_code             int
+	net.peer.name                   string
+	net.peer.port                   int
+	*/
+
+	n := 2 // method, peer name.
+	var h string
+	if req.URL != nil {
+		h = req.URL.Host
+	}
+	var requestHost string
+	var requestPort int
+	for _, hostport := range []string{h, req.Header.Get("Host")} {
+		requestHost, requestPort = splitHostPort(hostport)
+		if requestHost != "" || requestPort > 0 {
+			break
+		}
+	}
+
+	port := requiredHTTPPort(req.URL != nil && req.URL.Scheme == "https", requestPort)
+	if port > 0 {
+		n++
+	}
+
+	if statusCode > 0 {
+		n++
+	}
+
+	attributes := slices.Grow(additionalAttributes, n)
+	attributes = append(attributes,
+		standardizeHTTPMethodMetric(req.Method),
+		semconv.NetPeerName(requestHost),
+	)
+
+	if port > 0 {
+		attributes = append(attributes, semconv.NetPeerPort(port))
+	}
+
+	if statusCode > 0 {
+		attributes = append(attributes, semconv.HTTPStatusCode(statusCode))
+	}
+	return attributes
+}
+
+// Client HTTP metrics.
+const (
+	clientRequestSize  = "http.client.request.size"  // Incoming request bytes total
+	clientResponseSize = "http.client.response.size" // Incoming response bytes total
+	clientDuration     = "http.client.duration"      // Incoming end to end duration, milliseconds
+)
+
+func (o oldHTTPClient) createMeasures(meter metric.Meter) (metric.Int64Counter, metric.Int64Counter, metric.Float64Histogram) {
+	if meter == nil {
+		return noop.Int64Counter{}, noop.Int64Counter{}, noop.Float64Histogram{}
+	}
+	requestBytesCounter, err := meter.Int64Counter(
+		clientRequestSize,
+		metric.WithUnit("By"),
+		metric.WithDescription("Measures the size of HTTP request messages."),
+	)
+	handleErr(err)
+
+	responseBytesCounter, err := meter.Int64Counter(
+		clientResponseSize,
+		metric.WithUnit("By"),
+		metric.WithDescription("Measures the size of HTTP response messages."),
+	)
+	handleErr(err)
+
+	latencyMeasure, err := meter.Float64Histogram(
+		clientDuration,
+		metric.WithUnit("ms"),
+		metric.WithDescription("Measures the duration of outbound HTTP requests."),
+	)
+	handleErr(err)
+
+	return requestBytesCounter, responseBytesCounter, latencyMeasure
+}
+
+func standardizeHTTPMethodMetric(method string) attribute.KeyValue {
+	method = strings.ToUpper(method)
+	switch method {
+	case http.MethodConnect, http.MethodDelete, http.MethodGet, http.MethodHead, http.MethodOptions, http.MethodPatch, http.MethodPost, http.MethodPut, http.MethodTrace:
+	default:
+		method = "_OTHER"
+	}
+	return semconv.HTTPMethod(method)
+}

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconvutil/netconv.go

@@ -195,7 +195,7 @@ func splitHostPort(hostport string) (host string, port int) {
 	if err != nil {
 		return
 	}
-	return host, int(p)
+	return host, int(p) // nolint: gosec  // Bitsize checked to be 16 above.
 }
 
 func netProtocol(proto string) (name string, version string) {

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/start_time_context.go

@@ -0,0 +1,29 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package otelhttp // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
+
+import (
+	"context"
+	"time"
+)
+
+type startTimeContextKeyType int
+
+const startTimeContextKey startTimeContextKeyType = 0
+
+// ContextWithStartTime returns a new context with the provided start time. The
+// start time will be used for metrics and traces emitted by the
+// instrumentation. Only one labeller can be injected into the context.
+// Injecting it multiple times will override the previous calls.
+func ContextWithStartTime(parent context.Context, start time.Time) context.Context {
+	return context.WithValue(parent, startTimeContextKey, start)
+}
+
+// StartTimeFromContext retrieves a time.Time from the provided context if one
+// is available. If no start time was found in the provided context, a new,
+// zero start time is returned and the second return value is false.
+func StartTimeFromContext(ctx context.Context) time.Time {
+	t, _ := ctx.Value(startTimeContextKey).(time.Time)
+	return t
+}

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/transport.go

@@ -11,13 +11,13 @@ import (
 	"sync/atomic"
 	"time"
 
-	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconvutil"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/request"
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/internal/semconv"
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/codes"
-	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/propagation"
-	semconv "go.opentelemetry.io/otel/semconv/v1.20.0"
+
 	"go.opentelemetry.io/otel/trace"
 )
 
@@ -26,17 +26,15 @@ import (
 type Transport struct {
 	rt http.RoundTripper
 
-	tracer            trace.Tracer
-	meter             metric.Meter
-	propagators       propagation.TextMapPropagator
-	spanStartOptions  []trace.SpanStartOption
-	filters           []Filter
-	spanNameFormatter func(string, *http.Request) string
-	clientTrace       func(context.Context) *httptrace.ClientTrace
+	tracer             trace.Tracer
+	propagators        propagation.TextMapPropagator
+	spanStartOptions   []trace.SpanStartOption
+	filters            []Filter
+	spanNameFormatter  func(string, *http.Request) string
+	clientTrace        func(context.Context) *httptrace.ClientTrace
+	metricAttributesFn func(*http.Request) []attribute.KeyValue
 
-	requestBytesCounter  metric.Int64Counter
-	responseBytesCounter metric.Int64Counter
-	latencyMeasure       metric.Float64Histogram
+	semconv semconv.HTTPClient
 }
 
 var _ http.RoundTripper = &Transport{}
@@ -63,43 +61,19 @@ func NewTransport(base http.RoundTripper, opts ...Option) *Transport {
 
 	c := newConfig(append(defaultOpts, opts...)...)
 	t.applyConfig(c)
-	t.createMeasures()
 
 	return &t
 }
 
 func (t *Transport) applyConfig(c *config) {
 	t.tracer = c.Tracer
-	t.meter = c.Meter
 	t.propagators = c.Propagators
 	t.spanStartOptions = c.SpanStartOptions
 	t.filters = c.Filters
 	t.spanNameFormatter = c.SpanNameFormatter
 	t.clientTrace = c.ClientTrace
-}
-
-func (t *Transport) createMeasures() {
-	var err error
-	t.requestBytesCounter, err = t.meter.Int64Counter(
-		clientRequestSize,
-		metric.WithUnit("By"),
-		metric.WithDescription("Measures the size of HTTP request messages."),
-	)
-	handleErr(err)
-
-	t.responseBytesCounter, err = t.meter.Int64Counter(
-		clientResponseSize,
-		metric.WithUnit("By"),
-		metric.WithDescription("Measures the size of HTTP response messages."),
-	)
-	handleErr(err)
-
-	t.latencyMeasure, err = t.meter.Float64Histogram(
-		clientDuration,
-		metric.WithUnit("ms"),
-		metric.WithDescription("Measures the duration of outbound HTTP requests."),
-	)
-	handleErr(err)
+	t.semconv = semconv.NewHTTPClient(c.Meter)
+	t.metricAttributesFn = c.MetricAttributesFn
 }
 
 func defaultTransportFormatter(_ string, r *http.Request) string {
@@ -143,54 +117,68 @@ func (t *Transport) RoundTrip(r *http.Request) (*http.Response, error) {
 
 	r = r.Clone(ctx) // According to RoundTripper spec, we shouldn't modify the origin request.
 
-	// use a body wrapper to determine the request size
-	var bw bodyWrapper
 	// if request body is nil or NoBody, we don't want to mutate the body as it
 	// will affect the identity of it in an unforeseeable way because we assert
 	// ReadCloser fulfills a certain interface and it is indeed nil or NoBody.
+	bw := request.NewBodyWrapper(r.Body, func(int64) {})
 	if r.Body != nil && r.Body != http.NoBody {
-		bw.ReadCloser = r.Body
-		// noop to prevent nil panic. not using this record fun yet.
-		bw.record = func(int64) {}
-		r.Body = &bw
+		r.Body = bw
 	}
 
-	span.SetAttributes(semconvutil.HTTPClientRequest(r)...)
+	span.SetAttributes(t.semconv.RequestTraceAttrs(r)...)
 	t.propagators.Inject(ctx, propagation.HeaderCarrier(r.Header))
 
 	res, err := t.rt.RoundTrip(r)
 	if err != nil {
-		span.RecordError(err)
+		// set error type attribute if the error is part of the predefined
+		// error types.
+		// otherwise, record it as an exception
+		if errType := t.semconv.ErrorType(err); errType.Valid() {
+			span.SetAttributes(errType)
+		} else {
+			span.RecordError(err)
+		}
+
 		span.SetStatus(codes.Error, err.Error())
 		span.End()
 		return res, err
 	}
 
 	// metrics
-	metricAttrs := append(labeler.Get(), semconvutil.HTTPClientRequestMetrics(r)...)
-	if res.StatusCode > 0 {
-		metricAttrs = append(metricAttrs, semconv.HTTPStatusCode(res.StatusCode))
-	}
-	o := metric.WithAttributeSet(attribute.NewSet(metricAttrs...))
-	addOpts := []metric.AddOption{o} // Allocate vararg slice once.
-	t.requestBytesCounter.Add(ctx, bw.read.Load(), addOpts...)
+	metricOpts := t.semconv.MetricOptions(semconv.MetricAttributes{
+		Req:                  r,
+		StatusCode:           res.StatusCode,
+		AdditionalAttributes: append(labeler.Get(), t.metricAttributesFromRequest(r)...),
+	})
+
 	// For handling response bytes we leverage a callback when the client reads the http response
 	readRecordFunc := func(n int64) {
-		t.responseBytesCounter.Add(ctx, n, addOpts...)
+		t.semconv.RecordResponseSize(ctx, n, metricOpts.AddOptions())
 	}
 
 	// traces
-	span.SetAttributes(semconvutil.HTTPClientResponse(res)...)
-	span.SetStatus(semconvutil.HTTPClientStatus(res.StatusCode))
+	span.SetAttributes(t.semconv.ResponseTraceAttrs(res)...)
+	span.SetStatus(t.semconv.Status(res.StatusCode))
 
 	res.Body = newWrappedBody(span, readRecordFunc, res.Body)
 
 	// Use floating point division here for higher precision (instead of Millisecond method).
 	elapsedTime := float64(time.Since(requestStartTime)) / float64(time.Millisecond)
 
-	t.latencyMeasure.Record(ctx, elapsedTime, o)
+	t.semconv.RecordMetrics(ctx, semconv.MetricData{
+		RequestSize: bw.BytesRead(),
+		ElapsedTime: elapsedTime,
+	}, metricOpts)
 
-	return res, err
+	return res, nil
+}
+
+func (t *Transport) metricAttributesFromRequest(r *http.Request) []attribute.KeyValue {
+	var attributeForRequest []attribute.KeyValue
+	if t.metricAttributesFn != nil {
+		attributeForRequest = t.metricAttributesFn(r)
+	}
+	return attributeForRequest
 }
 
 // newWrappedBody returns a new and appropriately scoped *wrappedBody as an

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/version.go

@@ -5,7 +5,7 @@ package otelhttp // import "go.opentelemetry.io/contrib/instrumentation/net/http
 
 // Version is the current release version of the otelhttp instrumentation.
 func Version() string {
-	return "0.53.0"
+	return "0.57.0"
 	// This string is updated by the pre_release.sh script during release
 }
 

vendor/go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp/wrap.go

@@ -1,99 +0,0 @@
-// Copyright The OpenTelemetry Authors
-// SPDX-License-Identifier: Apache-2.0
-
-package otelhttp // import "go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
-
-import (
-	"context"
-	"io"
-	"net/http"
-	"sync/atomic"
-
-	"go.opentelemetry.io/otel/propagation"
-)
-
-var _ io.ReadCloser = &bodyWrapper{}
-
-// bodyWrapper wraps a http.Request.Body (an io.ReadCloser) to track the number
-// of bytes read and the last error.
-type bodyWrapper struct {
-	io.ReadCloser
-	record func(n int64) // must not be nil
-
-	read atomic.Int64
-	err  error
-}
-
-func (w *bodyWrapper) Read(b []byte) (int, error) {
-	n, err := w.ReadCloser.Read(b)
-	n1 := int64(n)
-	w.read.Add(n1)
-	w.err = err
-	w.record(n1)
-	return n, err
-}
-
-func (w *bodyWrapper) Close() error {
-	return w.ReadCloser.Close()
-}
-
-var _ http.ResponseWriter = &respWriterWrapper{}
-
-// respWriterWrapper wraps a http.ResponseWriter in order to track the number of
-// bytes written, the last error, and to catch the first written statusCode.
-// TODO: The wrapped http.ResponseWriter doesn't implement any of the optional
-// types (http.Hijacker, http.Pusher, http.CloseNotifier, http.Flusher, etc)
-// that may be useful when using it in real life situations.
-type respWriterWrapper struct {
-	http.ResponseWriter
-	record func(n int64) // must not be nil
-
-	// used to inject the header
-	ctx context.Context
-
-	props propagation.TextMapPropagator
-
-	written     int64
-	statusCode  int
-	err         error
-	wroteHeader bool
-}
-
-func (w *respWriterWrapper) Header() http.Header {
-	return w.ResponseWriter.Header()
-}
-
-func (w *respWriterWrapper) Write(p []byte) (int, error) {
-	if !w.wroteHeader {
-		w.WriteHeader(http.StatusOK)
-	}
-	n, err := w.ResponseWriter.Write(p)
-	n1 := int64(n)
-	w.record(n1)
-	w.written += n1
-	w.err = err
-	return n, err
-}
-
-// WriteHeader persists initial statusCode for span attribution.
-// All calls to WriteHeader will be propagated to the underlying ResponseWriter
-// and will persist the statusCode from the first call.
-// Blocking consecutive calls to WriteHeader alters expected behavior and will
-// remove warning logs from net/http where developers will notice incorrect handler implementations.
-func (w *respWriterWrapper) WriteHeader(statusCode int) {
-	if !w.wroteHeader {
-		w.wroteHeader = true
-		w.statusCode = statusCode
-	}
-	w.ResponseWriter.WriteHeader(statusCode)
-}
-
-func (w *respWriterWrapper) Flush() {
-	if !w.wroteHeader {
-		w.WriteHeader(http.StatusOK)
-	}
-
-	if f, ok := w.ResponseWriter.(http.Flusher); ok {
-		f.Flush()
-	}
-}

vendor/go.opentelemetry.io/otel/.gitignore

@@ -12,11 +12,3 @@ go.work
 go.work.sum
 
 gen/
-
-/example/dice/dice
-/example/namedtracer/namedtracer
-/example/otel-collector/otel-collector
-/example/opencensus/opencensus
-/example/passthrough/passthrough
-/example/prometheus/prometheus
-/example/zipkin/zipkin

vendor/go.opentelemetry.io/otel/.golangci.yml

@@ -9,6 +9,8 @@ linters:
   disable-all: true
   # Specifically enable linters we want to use.
   enable:
+    - asasalint
+    - bodyclose
     - depguard
     - errcheck
     - errorlint
@@ -23,6 +25,7 @@ linters:
     - revive
     - staticcheck
     - tenv
+    - testifylint
     - typecheck
     - unconvert
     - unused
@@ -62,12 +65,12 @@ issues:
     - path: _test\.go
       linters:
         - gosec
-    # Igonoring gosec G404: Use of weak random number generator (math/rand instead of crypto/rand)
+    # Ignoring gosec G404: Use of weak random number generator (math/rand instead of crypto/rand)
     # as we commonly use it in tests and examples.
     - text: "G404:"
       linters:
         - gosec
-    # Igonoring gosec G402: TLS MinVersion too low
+    # Ignoring gosec G402: TLS MinVersion too low
     # as the https://pkg.go.dev/crypto/tls#Config handles MinVersion default well.
     - text: "G402: TLS MinVersion too low."
       linters:
@@ -124,8 +127,6 @@ linters-settings:
           - "**/metric/**/*.go"
           - "**/bridge/*.go"
           - "**/bridge/**/*.go"
-          - "**/example/*.go"
-          - "**/example/**/*.go"
           - "**/trace/*.go"
           - "**/trace/**/*.go"
           - "**/log/*.go"
@@ -300,3 +301,9 @@ linters-settings:
       # https://github.com/mgechev/revive/blob/master/RULES_DESCRIPTIONS.md#waitgroup-by-value
       - name: waitgroup-by-value
         disabled: false
+  testifylint:
+    enable-all: true
+    disable:
+      - float-compare
+      - go-require
+      - require-error

vendor/go.opentelemetry.io/otel/CHANGELOG.md

@@ -8,6 +8,158 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+<!-- Released section -->
+<!-- Don't change this section unless doing release -->
+
+## [1.32.0/0.54.0/0.8.0/0.0.11] 2024-11-08
+
+### Added
+
+- Add `go.opentelemetry.io/otel/sdk/metric/exemplar.AlwaysOffFilter`, which can be used to disable exemplar recording. (#5850)
+- Add `go.opentelemetry.io/otel/sdk/metric.WithExemplarFilter`, which can be used to configure the exemplar filter used by the metrics SDK. (#5850)
+- Add `ExemplarReservoirProviderSelector` and `DefaultExemplarReservoirProviderSelector` to `go.opentelemetry.io/otel/sdk/metric`, which defines the exemplar reservoir to use based on the aggregation of the metric. (#5861)
+- Add `ExemplarReservoirProviderSelector` to `go.opentelemetry.io/otel/sdk/metric.Stream` to allow using views to configure the exemplar reservoir to use for a metric. (#5861)
+- Add `ReservoirProvider`, `HistogramReservoirProvider` and `FixedSizeReservoirProvider` to `go.opentelemetry.io/otel/sdk/metric/exemplar` to make it convenient to use providers of Reservoirs. (#5861)
+- The `go.opentelemetry.io/otel/semconv/v1.27.0` package.
+  The package contains semantic conventions from the `v1.27.0` version of the OpenTelemetry Semantic Conventions. (#5894)
+- Add `Attributes attribute.Set` field to `Scope` in `go.opentelemetry.io/otel/sdk/instrumentation`. (#5903)
+- Add `Attributes attribute.Set` field to `ScopeRecords` in `go.opentelemetry.io/otel/log/logtest`. (#5927)
+- `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc` adds instrumentation scope attributes. (#5934)
+- `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp` adds instrumentation scope attributes. (#5934)
+- `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc` adds instrumentation scope attributes. (#5935)
+- `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp` adds instrumentation scope attributes. (#5935)
+- `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc` adds instrumentation scope attributes. (#5933)
+- `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp` adds instrumentation scope attributes. (#5933)
+- `go.opentelemetry.io/otel/exporters/prometheus` adds instrumentation scope attributes in `otel_scope_info` metric as labels. (#5932)
+
+### Changed
+
+- Support scope attributes and make them as identifying for `Tracer` in `go.opentelemetry.io/otel` and `go.opentelemetry.io/otel/sdk/trace`. (#5924)
+- Support scope attributes and make them as identifying for `Meter` in `go.opentelemetry.io/otel` and `go.opentelemetry.io/otel/sdk/metric`. (#5926)
+- Support scope attributes and make them as identifying for `Logger` in `go.opentelemetry.io/otel` and `go.opentelemetry.io/otel/sdk/log`. (#5925)
+- Make schema URL and scope attributes as identifying for `Tracer` in `go.opentelemetry.io/otel/bridge/opentracing`. (#5931)
+- Clear unneeded slice elements to allow GC to collect the objects in `go.opentelemetry.io/otel/sdk/metric` and `go.opentelemetry.io/otel/sdk/trace`. (#5804)
+
+### Fixed
+
+- Global MeterProvider registration unwraps global instrument Observers, the undocumented Unwrap() methods are now private. (#5881)
+- `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc` now keeps the metadata already present in the context when `WithHeaders` is used. (#5892)
+- `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc` now keeps the metadata already present in the context when `WithHeaders` is used. (#5911)
+- `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc` now keeps the metadata already present in the context when `WithHeaders` is used. (#5915)
+- Fix `go.opentelemetry.io/otel/exporters/prometheus` trying to add exemplars to Gauge metrics, which is unsupported. (#5912)
+- Fix `WithEndpointURL` to always use a secure connection when an https URL is passed in `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc`. (#5944)
+- Fix `WithEndpointURL` to always use a secure connection when an https URL is passed in `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp`. (#5944)
+- Fix `WithEndpointURL` to always use a secure connection when an https URL is passed in `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc`. (#5944)
+- Fix `WithEndpointURL` to always use a secure connection when an https URL is passed in `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp`. (#5944)
+- Fix incorrect metrics generated from callbacks when multiple readers are used in `go.opentelemetry.io/otel/sdk/metric`. (#5900)
+
+### Removed
+
+- Remove all examples under `go.opentelemetry.io/otel/example` as they are moved to [Contrib repository](https://github.com/open-telemetry/opentelemetry-go-contrib/tree/main/examples). (#5930)
+
+## [1.31.0/0.53.0/0.7.0/0.0.10] 2024-10-11
+
+### Added
+
+- Add `go.opentelemetry.io/otel/sdk/metric/exemplar` package which includes `Exemplar`, `Filter`, `TraceBasedFilter`, `AlwaysOnFilter`, `HistogramReservoir`, `FixedSizeReservoir`, `Reservoir`, `Value` and `ValueType` types. These will be used for configuring the exemplar reservoir for the metrics sdk. (#5747, #5862)
+- Add `WithExportBufferSize` option to log batch processor.(#5877)
+
+### Changed
+
+- Enable exemplars by default in `go.opentelemetry.io/otel/sdk/metric`. Exemplars can be disabled by setting `OTEL_METRICS_EXEMPLAR_FILTER=always_off` (#5778)
+- `Logger.Enabled` in `go.opentelemetry.io/otel/log` now accepts a newly introduced `EnabledParameters` type instead of `Record`. (#5791)
+- `FilterProcessor.Enabled` in `go.opentelemetry.io/otel/sdk/log/internal/x` now accepts `EnabledParameters` instead of `Record`. (#5791)
+- The `Record` type in `go.opentelemetry.io/otel/log` is no longer comparable. (#5847)
+- Performance improvements for the trace SDK `SetAttributes` method in `Span`. (#5864)
+- Reduce memory allocations for the `Event` and `Link` lists in `Span`. (#5858)
+- Performance improvements for the trace SDK `AddEvent`, `AddLink`, `RecordError` and `End` methods in `Span`. (#5874)
+
+### Deprecated
+
+- Deprecate all examples under `go.opentelemetry.io/otel/example` as they are moved to [Contrib repository](https://github.com/open-telemetry/opentelemetry-go-contrib/tree/main/examples). (#5854)
+
+### Fixed
+
+- The race condition for multiple `FixedSize` exemplar reservoirs identified in #5814 is resolved. (#5819)
+- Fix log records duplication in case of heterogeneous resource attributes by correctly mapping each log record to it's resource and scope. (#5803)
+- Fix timer channel drain to avoid hanging on Go 1.23. (#5868)
+- Fix delegation for global meter providers, and panic when calling otel.SetMeterProvider. (#5827)
+- Change the `reflect.TypeOf` to use a nil pointer to not allocate on the heap unless necessary. (#5827)
+
+## [1.30.0/0.52.0/0.6.0/0.0.9] 2024-09-09
+
+### Added
+
+- Support `OTEL_EXPORTER_OTLP_LOGS_INSECURE` and `OTEL_EXPORTER_OTLP_INSECURE` environments in `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc`. (#5739)
+- The `WithResource` option for `NewMeterProvider` now merges the provided resources with the ones from environment variables. (#5773)
+- The `WithResource` option for `NewLoggerProvider` now merges the provided resources with the ones from environment variables. (#5773)
+- Add UTF-8 support to `go.opentelemetry.io/otel/exporters/prometheus`. (#5755)
+
+### Fixed
+
+- Fix memory leak in the global `MeterProvider` when identical instruments are repeatedly created. (#5754)
+- Fix panic on instruments creation when setting meter provider. (#5758)
+- Fix an issue where `SetMeterProvider` in `go.opentelemetry.io/otel` might miss the delegation for instruments and registries. (#5780)
+
+### Removed
+
+- Drop support for [Go 1.21]. (#5736, #5740, #5800)
+
+## [1.29.0/0.51.0/0.5.0] 2024-08-23
+
+This release is the last to support [Go 1.21].
+The next release will require at least [Go 1.22].
+
+### Added
+
+- Add MacOS ARM64 platform to the compatibility testing suite. (#5577)
+- Add `InstrumentationScope` field to `SpanStub` in `go.opentelemetry.io/otel/sdk/trace/tracetest`, as a replacement for the deprecated `InstrumentationLibrary`. (#5627)
+- Make the initial release of `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc`.
+  This new module contains an OTLP exporter that transmits log telemetry using gRPC.
+  This module is unstable and breaking changes may be introduced.
+  See our [versioning policy](VERSIONING.md) for more information about these stability guarantees. (#5629)
+- Add `Walk` function to `TraceState` in `go.opentelemetry.io/otel/trace` to iterate all the key-value pairs. (#5651)
+- Bridge the trace state in `go.opentelemetry.io/otel/bridge/opencensus`. (#5651)
+- Zero value of `SimpleProcessor` in `go.opentelemetry.io/otel/sdk/log` no longer panics. (#5665)
+- The `FilterProcessor` interface type is added in `go.opentelemetry.io/otel/sdk/log/internal/x`.
+  This is an optional and experimental interface that log `Processor`s can implement to instruct the `Logger` if a `Record` will be processed or not.
+  It replaces the existing `Enabled` method that is removed from the `Processor` interface itself.
+  It does not fall within the scope of the OpenTelemetry Go versioning and stability [policy](./VERSIONING.md) and it may be changed in backwards incompatible ways or removed in feature releases. (#5692)
+- Support [Go 1.23]. (#5720)
+
+### Changed
+
+- `NewMemberRaw`, `NewKeyProperty` and `NewKeyValuePropertyRaw` in `go.opentelemetry.io/otel/baggage` allow UTF-8 string in key. (#5132)
+- `Processor.OnEmit` in `go.opentelemetry.io/otel/sdk/log` now accepts a pointer to `Record` instead of a value so that the record modifications done in a processor are propagated to subsequent registered processors. (#5636)
+- `SimpleProcessor.Enabled` in `go.opentelemetry.io/otel/sdk/log` now returns `false` if the exporter is `nil`. (#5665)
+- Update the concurrency requirements of `Exporter` in `go.opentelemetry.io/otel/sdk/log`. (#5666)
+- `SimpleProcessor` in `go.opentelemetry.io/otel/sdk/log` synchronizes `OnEmit` calls. (#5666)
+- The `Processor` interface in `go.opentelemetry.io/otel/sdk/log` no longer includes the `Enabled` method.
+  See the `FilterProcessor` interface type added in `go.opentelemetry.io/otel/sdk/log/internal/x` to continue providing this functionality. (#5692)
+- The `SimpleProcessor` type in `go.opentelemetry.io/otel/sdk/log` is no longer comparable. (#5693)
+- The `BatchProcessor` type in `go.opentelemetry.io/otel/sdk/log` is no longer comparable. (#5693)
+
+### Fixed
+
+- Correct comments for the priority of the `WithEndpoint` and `WithEndpointURL` options and their corresponding environment variables in `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp`. (#5584)
+- Pass the underlying error rather than a generic retry-able failure in `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp`, `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp` and `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp`. (#5541)
+- Correct the `Tracer`, `Meter`, and `Logger` names used in `go.opentelemetry.io/otel/example/dice`. (#5612)
+- Correct the `Tracer` names used in `go.opentelemetry.io/otel/example/namedtracer`. (#5612)
+- Correct the `Tracer` name used in `go.opentelemetry.io/otel/example/opencensus`. (#5612)
+- Correct the `Tracer` and `Meter` names used in `go.opentelemetry.io/otel/example/otel-collector`. (#5612)
+- Correct the `Tracer` names used in `go.opentelemetry.io/otel/example/passthrough`. (#5612)
+- Correct the `Meter` name used in `go.opentelemetry.io/otel/example/prometheus`. (#5612)
+- Correct the `Tracer` names used in `go.opentelemetry.io/otel/example/zipkin`. (#5612)
+- Correct comments for the priority of the `WithEndpoint` and `WithEndpointURL` options and their corresponding environment variables in `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc` and `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp`. (#5641)
+- Correct comments for the priority of the `WithEndpoint` and `WithEndpointURL` options and their corresponding environment variables in `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp`. (#5650)
+- Stop percent encoding header environment variables in `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc`, `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp`, `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc` and `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp` (#5705)
+- Remove invalid environment variable header keys in `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc`, `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp`, `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc` and `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp` (#5705)
+
+### Removed
+
+- The `Enabled` method of the `SimpleProcessor` in `go.opentelemetry.io/otel/sdk/log` is removed. (#5692)
+- The `Enabled` method of the `BatchProcessor` in `go.opentelemetry.io/otel/sdk/log` is removed. (#5692)
+
 ## [1.28.0/0.50.0/0.4.0] 2024-07-02
 
 ### Added
@@ -49,6 +201,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Fix stale timestamps reported by the last-value aggregation. (#5517)
 - Indicate the `Exporter` in `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp` must be created by the `New` method. (#5521)
 - Improved performance in all `{Bool,Int64,Float64,String}SliceValue` functions of `go.opentelemetry.io/attributes` by reducing the number of allocations. (#5549)
+- Replace invalid percent-encoded octet sequences with replacement char in `go.opentelemetry.io/otel/baggage`. (#5528)
 
 ## [1.27.0/0.49.0/0.3.0] 2024-05-21
 
@@ -175,7 +328,7 @@ The next release will require at least [Go 1.21].
   This module includes OpenTelemetry Go's implementation of the Logs Bridge API.
   This module is in an alpha state, it is subject to breaking changes.
   See our [versioning policy](./VERSIONING.md) for more info. (#4961)
-- ARM64 platform to the compatibility testing suite. (#4994)
+- Add ARM64 platform to the compatibility testing suite. (#4994)
 
 ### Fixed
 
@@ -1836,7 +1989,7 @@ with major version 0.
 - Setting error status while recording error with Span from oteltest package. (#1729)
 - The concept of a remote and local Span stored in a context is unified to just the current Span.
   Because of this `"go.opentelemetry.io/otel/trace".RemoteSpanContextFromContext` is removed as it is no longer needed.
-  Instead, `"go.opentelemetry.io/otel/trace".SpanContextFromContex` can be used to return the current Span.
+  Instead, `"go.opentelemetry.io/otel/trace".SpanContextFromContext` can be used to return the current Span.
   If needed, that Span's `SpanContext.IsRemote()` can then be used to determine if it is remote or not. (#1731)
 - The `HasRemoteParent` field of the `"go.opentelemetry.io/otel/sdk/trace".SamplingParameters` is removed.
   This field is redundant to the information returned from the `Remote` method of the `SpanContext` held in the `ParentContext` field. (#1749)
@@ -2410,7 +2563,7 @@ This release migrates the default OpenTelemetry SDK into its own Go module, deco
 - Prometheus exporter will not apply stale updates or forget inactive metrics. (#903)
 - Add test for api.standard `HTTPClientAttributesFromHTTPRequest`. (#905)
 - Bump github.com/golangci/golangci-lint from 1.27.0 to 1.28.1 in /tools. (#901, #913)
-- Update otel-colector example to use the v0.5.0 collector. (#915)
+- Update otel-collector example to use the v0.5.0 collector. (#915)
 - The `grpctrace` instrumentation uses a span name conforming to the OpenTelemetry semantic conventions (does not contain a leading slash (`/`)). (#922)
 - The `grpctrace` instrumentation includes an `rpc.method` attribute now set to the gRPC method name. (#900, #922)
 - The `grpctrace` instrumentation `rpc.service` attribute now contains the package name if one exists.
@@ -3003,7 +3156,11 @@ It contains api and sdk for trace and meter.
 - CircleCI build CI manifest files.
 - CODEOWNERS file to track owners of this project.
 
-[Unreleased]: https://github.com/open-telemetry/opentelemetry-go/compare/v1.28.0...HEAD
+[Unreleased]: https://github.com/open-telemetry/opentelemetry-go/compare/v1.32.0...HEAD
+[1.32.0/0.54.0/0.8.0/0.0.11]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.32.0
+[1.31.0/0.53.0/0.7.0/0.0.10]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.31.0
+[1.30.0/0.52.0/0.6.0/0.0.9]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.30.0
+[1.29.0/0.51.0/0.5.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.29.0
 [1.28.0/0.50.0/0.4.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.28.0
 [1.27.0/0.49.0/0.3.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.27.0
 [1.26.0/0.48.0/0.2.0-alpha]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.26.0
@@ -3086,6 +3243,9 @@ It contains api and sdk for trace and meter.
 [0.1.1]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v0.1.1
 [0.1.0]: https://github.com/open-telemetry/opentelemetry-go/releases/tag/v0.1.0
 
+<!-- Released section ended -->
+
+[Go 1.23]: https://go.dev/doc/go1.23
 [Go 1.22]: https://go.dev/doc/go1.22
 [Go 1.21]: https://go.dev/doc/go1.21
 [Go 1.20]: https://go.dev/doc/go1.20

vendor/go.opentelemetry.io/otel/CODEOWNERS

@@ -5,13 +5,13 @@
 #####################################################
 #
 # Learn about membership in OpenTelemetry community:
-#  https://github.com/open-telemetry/community/blob/main/community-membership.md
+#  https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md
 #
 #
 # Learn about CODEOWNERS file format:
 #  https://help.github.com/en/articles/about-code-owners
 #
 
-* @MrAlias @XSAM @dashpole @MadVikingGod @pellared @hanyuancheung @dmathieu
+* @MrAlias @XSAM @dashpole @pellared @dmathieu
 
-CODEOWNERS @MrAlias @MadVikingGod @pellared @dashpole @XSAM @dmathieu
+CODEOWNERS @MrAlias @pellared @dashpole @XSAM @dmathieu

vendor/go.opentelemetry.io/otel/CONTRIBUTING.md

@@ -578,7 +578,10 @@ See also:
 The tests should never leak goroutines.
 
 Use the term `ConcurrentSafe` in the test name when it aims to verify the
-absence of race conditions.
+absence of race conditions. The top-level tests with this term will be run
+many times in the `test-concurrent-safe` CI job to increase the chance of
+catching concurrency issues. This does not apply to subtests when this term
+is not in their root name.
 
 ### Internal packages
 
@@ -626,13 +629,14 @@ should be canceled.
 
 ## Approvers and Maintainers
 
-### Approvers
+### Triagers
 
-- [Chester Cheung](https://github.com/hanyuancheung), Tencent
+- [Cheng-Zhen Yang](https://github.com/scorpionknifes), Independent
+
+### Approvers
 
 ### Maintainers
 
-- [Aaron Clawson](https://github.com/MadVikingGod), LightStep
 - [Damien Mathieu](https://github.com/dmathieu), Elastic
 - [David Ashpole](https://github.com/dashpole), Google
 - [Robert Pająk](https://github.com/pellared), Splunk
@@ -641,16 +645,18 @@ should be canceled.
 
 ### Emeritus
 
-- [Liz Fong-Jones](https://github.com/lizthegrey), Honeycomb
-- [Gustavo Silva Paiva](https://github.com/paivagustavo), LightStep
-- [Josh MacDonald](https://github.com/jmacd), LightStep
-- [Anthony Mirabella](https://github.com/Aneurysm9), AWS
-- [Evan Torrie](https://github.com/evantorrie), Yahoo
+- [Aaron Clawson](https://github.com/MadVikingGod)
+- [Anthony Mirabella](https://github.com/Aneurysm9)
+- [Chester Cheung](https://github.com/hanyuancheung)
+- [Evan Torrie](https://github.com/evantorrie)
+- [Gustavo Silva Paiva](https://github.com/paivagustavo)
+- [Josh MacDonald](https://github.com/jmacd)
+- [Liz Fong-Jones](https://github.com/lizthegrey)
 
 ### Become an Approver or a Maintainer
 
 See the [community membership document in OpenTelemetry community
-repo](https://github.com/open-telemetry/community/blob/main/community-membership.md).
+repo](https://github.com/open-telemetry/community/blob/main/guides/contributor/membership.md).
 
 [Approver]: #approvers
 [Maintainer]: #maintainers

vendor/go.opentelemetry.io/otel/Makefile

@@ -54,9 +54,6 @@ $(TOOLS)/stringer: PACKAGE=golang.org/x/tools/cmd/stringer
 PORTO = $(TOOLS)/porto
 $(TOOLS)/porto: PACKAGE=github.com/jcchavezs/porto/cmd/porto
 
-GOJQ = $(TOOLS)/gojq
-$(TOOLS)/gojq: PACKAGE=github.com/itchyny/gojq/cmd/gojq
-
 GOTMPL = $(TOOLS)/gotmpl
 $(GOTMPL): PACKAGE=go.opentelemetry.io/build-tools/gotmpl
 
@@ -67,7 +64,7 @@ GOVULNCHECK = $(TOOLS)/govulncheck
 $(TOOLS)/govulncheck: PACKAGE=golang.org/x/vuln/cmd/govulncheck
 
 .PHONY: tools
-tools: $(CROSSLINK) $(GOLANGCI_LINT) $(MISSPELL) $(GOCOVMERGE) $(STRINGER) $(PORTO) $(GOJQ) $(SEMCONVGEN) $(MULTIMOD) $(SEMCONVKIT) $(GOTMPL) $(GORELEASE)
+tools: $(CROSSLINK) $(GOLANGCI_LINT) $(MISSPELL) $(GOCOVMERGE) $(STRINGER) $(PORTO) $(SEMCONVGEN) $(MULTIMOD) $(SEMCONVKIT) $(GOTMPL) $(GORELEASE)
 
 # Virtualized python tools via docker
 
@@ -145,12 +142,14 @@ build-tests/%:
 
 # Tests
 
-TEST_TARGETS := test-default test-bench test-short test-verbose test-race
+TEST_TARGETS := test-default test-bench test-short test-verbose test-race test-concurrent-safe
 .PHONY: $(TEST_TARGETS) test
 test-default test-race: ARGS=-race
 test-bench:   ARGS=-run=xxxxxMatchNothingxxxxx -test.benchtime=1ms -bench=.
 test-short:   ARGS=-short
 test-verbose: ARGS=-v -race
+test-concurrent-safe: ARGS=-run=ConcurrentSafe -count=100 -race
+test-concurrent-safe: TIMEOUT=120
 $(TEST_TARGETS): test
 test: $(OTEL_GO_MOD_DIRS:%=test/%)
 test/%: DIR=$*
@@ -178,17 +177,14 @@ test-coverage: $(GOCOVMERGE)
 	done; \
 	$(GOCOVMERGE) $$(find . -name coverage.out) > coverage.txt
 
-# Adding a directory will include all benchmarks in that directory if a filter is not specified.
-BENCHMARK_TARGETS := sdk/trace
 .PHONY: benchmark
-benchmark: $(BENCHMARK_TARGETS:%=benchmark/%)
-BENCHMARK_FILTER = .
-# You can override the filter for a particular directory by adding a rule here.
-benchmark/sdk/trace: BENCHMARK_FILTER = SpanWithAttributes_8/AlwaysSample
+benchmark: $(OTEL_GO_MOD_DIRS:%=benchmark/%)
 benchmark/%:
-	@echo "$(GO) test -timeout $(TIMEOUT)s -run=xxxxxMatchNothingxxxxx -bench=$(BENCHMARK_FILTER) $*..." \
+	@echo "$(GO) test -run=xxxxxMatchNothingxxxxx -bench=. $*..." \
 		&& cd $* \
-		$(foreach filter, $(BENCHMARK_FILTER), && $(GO) test -timeout $(TIMEOUT)s -run=xxxxxMatchNothingxxxxx -bench=$(filter))
+		&& $(GO) list ./... \
+		| grep -v third_party \
+		| xargs $(GO) test -run=xxxxxMatchNothingxxxxx -bench=.
 
 .PHONY: golangci-lint golangci-lint-fix
 golangci-lint-fix: ARGS=--fix
@@ -264,7 +260,7 @@ SEMCONVPKG ?= "semconv/"
 semconv-generate: $(SEMCONVGEN) $(SEMCONVKIT)
 	[ "$(TAG)" ] || ( echo "TAG unset: missing opentelemetry semantic-conventions tag"; exit 1 )
 	[ "$(OTEL_SEMCONV_REPO)" ] || ( echo "OTEL_SEMCONV_REPO unset: missing path to opentelemetry semantic-conventions repo"; exit 1 )
-	$(SEMCONVGEN) -i "$(OTEL_SEMCONV_REPO)/model/." --only=attribute_group -p conventionType=trace -f attribute_group.go -t "$(SEMCONVPKG)/template.j2" -s "$(TAG)"
+	$(SEMCONVGEN) -i "$(OTEL_SEMCONV_REPO)/model/." --only=attribute_group -p conventionType=trace -f attribute_group.go -z "$(SEMCONVPKG)/capitalizations.txt" -t "$(SEMCONVPKG)/template.j2" -s "$(TAG)"
 	$(SEMCONVGEN) -i "$(OTEL_SEMCONV_REPO)/model/." --only=metric  -f metric.go -t "$(SEMCONVPKG)/metric_template.j2" -s "$(TAG)"
 	$(SEMCONVKIT) -output "$(SEMCONVPKG)/$(TAG)" -tag "$(TAG)"
 

vendor/go.opentelemetry.io/otel/README.md

@@ -47,20 +47,22 @@ stop ensuring compatibility with these versions in the following manner:
 
 Currently, this project supports the following environments.
 
-| OS      | Go Version | Architecture |
-|---------|------------|--------------|
-| Ubuntu  | 1.22       | amd64        |
-| Ubuntu  | 1.21       | amd64        |
-| Ubuntu  | 1.22       | 386          |
-| Ubuntu  | 1.21       | 386          |
-| Linux   | 1.22       | arm64        |
-| Linux   | 1.21       | arm64        |
-| MacOS   | 1.22       | amd64        |
-| MacOS   | 1.21       | amd64        |
-| Windows | 1.22       | amd64        |
-| Windows | 1.21       | amd64        |
-| Windows | 1.22       | 386          |
-| Windows | 1.21       | 386          |
+| OS       | Go Version | Architecture |
+|----------|------------|--------------|
+| Ubuntu   | 1.23       | amd64        |
+| Ubuntu   | 1.22       | amd64        |
+| Ubuntu   | 1.23       | 386          |
+| Ubuntu   | 1.22       | 386          |
+| Linux    | 1.23       | arm64        |
+| Linux    | 1.22       | arm64        |
+| macOS 13 | 1.23       | amd64        |
+| macOS 13 | 1.22       | amd64        |
+| macOS    | 1.23       | arm64        |
+| macOS    | 1.22       | arm64        |
+| Windows  | 1.23       | amd64        |
+| Windows  | 1.22       | amd64        |
+| Windows  | 1.23       | 386          |
+| Windows  | 1.22       | 386          |
 
 While this project should work for other systems, no compatibility guarantees
 are made for those systems currently.
@@ -87,8 +89,8 @@ If you need to extend the telemetry an instrumentation library provides or want
 to build your own instrumentation for your application directly you will need
 to use the
 [Go otel](https://pkg.go.dev/go.opentelemetry.io/otel)
-package. The included [examples](./example/) are a good way to see some
-practical uses of this process.
+package. The [examples](https://github.com/open-telemetry/opentelemetry-go-contrib/tree/main/examples)
+are a good way to see some practical uses of this process.
 
 ### Export
 

vendor/go.opentelemetry.io/otel/RELEASING.md

@@ -69,6 +69,7 @@ Update go.mod for submodules to depend on the new release which will happen in t
        ```
 
    - Move all the `Unreleased` changes into a new section following the title scheme (`[<new tag>] - <date of release>`).
+   - Make sure the new section is under the comment for released section, like `<!-- Released section -->`, so it is protected from being overwritten in the future.
    - Update all the appropriate links at the bottom.
 
 4. Push the changes to upstream and create a Pull Request on GitHub.
@@ -110,17 +111,6 @@ It is critical you make sure the version you push upstream is correct.
 Finally create a Release for the new `<new tag>` on GitHub.
 The release body should include all the release notes from the Changelog for this release.
 
-## Verify Examples
-
-After releasing verify that examples build outside of the repository.
-
-```
-./verify_examples.sh
-```
-
-The script copies examples into a different directory removes any `replace` declarations in `go.mod` and builds them.
-This ensures they build with the published release, not the local copy.
-
 ## Post-Release
 
 ### Contrib Repository

vendor/go.opentelemetry.io/otel/attribute/set.go

@@ -347,45 +347,25 @@ func computeDistinct(kvs []KeyValue) Distinct {
 func computeDistinctFixed(kvs []KeyValue) interface{} {
 	switch len(kvs) {
 	case 1:
-		ptr := new([1]KeyValue)
-		copy((*ptr)[:], kvs)
-		return *ptr
+		return [1]KeyValue(kvs)
 	case 2:
-		ptr := new([2]KeyValue)
-		copy((*ptr)[:], kvs)
-		return *ptr
+		return [2]KeyValue(kvs)
 	case 3:
-		ptr := new([3]KeyValue)
-		copy((*ptr)[:], kvs)
-		return *ptr
+		return [3]KeyValue(kvs)
 	case 4:
-		ptr := new([4]KeyValue)
-		copy((*ptr)[:], kvs)
-		return *ptr
+		return [4]KeyValue(kvs)
 	case 5:
-		ptr := new([5]KeyValue)
-		copy((*ptr)[:], kvs)
-		return *ptr
+		return [5]KeyValue(kvs)
 	case 6:
-		ptr := new([6]KeyValue)
-		copy((*ptr)[:], kvs)
-		return *ptr
+		return [6]KeyValue(kvs)
 	case 7:
-		ptr := new([7]KeyValue)
-		copy((*ptr)[:], kvs)
-		return *ptr
+		return [7]KeyValue(kvs)
 	case 8:
-		ptr := new([8]KeyValue)
-		copy((*ptr)[:], kvs)
-		return *ptr
+		return [8]KeyValue(kvs)
 	case 9:
-		ptr := new([9]KeyValue)
-		copy((*ptr)[:], kvs)
-		return *ptr
+		return [9]KeyValue(kvs)
 	case 10:
-		ptr := new([10]KeyValue)
-		copy((*ptr)[:], kvs)
-		return *ptr
+		return [10]KeyValue(kvs)
 	default:
 		return nil
 	}

vendor/go.opentelemetry.io/otel/baggage/baggage.go

@@ -44,9 +44,15 @@ type Property struct {
 
 // NewKeyProperty returns a new Property for key.
 //
+// The passed key must be valid, non-empty UTF-8 string.
 // If key is invalid, an error will be returned.
+// However, the specific Propagators that are used to transmit baggage entries across
+// component boundaries may impose their own restrictions on Property key.
+// For example, the W3C Baggage specification restricts the Property keys to strings that
+// satisfy the token definition from RFC7230, Section 3.2.6.
+// For maximum compatibility, alphanumeric value are strongly recommended to be used as Property key.
 func NewKeyProperty(key string) (Property, error) {
-	if !validateKey(key) {
+	if !validateBaggageName(key) {
 		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidKey, key)
 	}
 
@@ -62,6 +68,10 @@ func NewKeyProperty(key string) (Property, error) {
 // Notice: Consider using [NewKeyValuePropertyRaw] instead
 // that does not require percent-encoding of the value.
 func NewKeyValueProperty(key, value string) (Property, error) {
+	if !validateKey(key) {
+		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidKey, key)
+	}
+
 	if !validateValue(value) {
 		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidValue, value)
 	}
@@ -74,11 +84,20 @@ func NewKeyValueProperty(key, value string) (Property, error) {
 
 // NewKeyValuePropertyRaw returns a new Property for key with value.
 //
-// The passed key must be compliant with W3C Baggage specification.
+// The passed key must be valid, non-empty UTF-8 string.
+// The passed value must be valid UTF-8 string.
+// However, the specific Propagators that are used to transmit baggage entries across
+// component boundaries may impose their own restrictions on Property key.
+// For example, the W3C Baggage specification restricts the Property keys to strings that
+// satisfy the token definition from RFC7230, Section 3.2.6.
+// For maximum compatibility, alphanumeric value are strongly recommended to be used as Property key.
 func NewKeyValuePropertyRaw(key, value string) (Property, error) {
-	if !validateKey(key) {
+	if !validateBaggageName(key) {
 		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidKey, key)
 	}
+	if !validateBaggageValue(value) {
+		return newInvalidProperty(), fmt.Errorf("%w: %q", errInvalidValue, value)
+	}
 
 	p := Property{
 		key:      key,
@@ -115,12 +134,15 @@ func (p Property) validate() error {
 		return fmt.Errorf("invalid property: %w", err)
 	}
 
-	if !validateKey(p.key) {
+	if !validateBaggageName(p.key) {
 		return errFunc(fmt.Errorf("%w: %q", errInvalidKey, p.key))
 	}
 	if !p.hasValue && p.value != "" {
 		return errFunc(errors.New("inconsistent value"))
 	}
+	if p.hasValue && !validateBaggageValue(p.value) {
+		return errFunc(fmt.Errorf("%w: %q", errInvalidValue, p.value))
+	}
 	return nil
 }
 
@@ -138,7 +160,15 @@ func (p Property) Value() (string, bool) {
 
 // String encodes Property into a header string compliant with the W3C Baggage
 // specification.
+// It would return empty string if the key is invalid with the W3C Baggage
+// specification. This could happen for a UTF-8 key, as it may contain
+// invalid characters.
 func (p Property) String() string {
+	//  W3C Baggage specification does not allow percent-encoded keys.
+	if !validateKey(p.key) {
+		return ""
+	}
+
 	if p.hasValue {
 		return fmt.Sprintf("%s%s%v", p.key, keyValueDelimiter, valueEscape(p.value))
 	}
@@ -203,9 +233,14 @@ func (p properties) validate() error {
 // String encodes properties into a header string compliant with the W3C Baggage
 // specification.
 func (p properties) String() string {
-	props := make([]string, len(p))
-	for i, prop := range p {
-		props[i] = prop.String()
+	props := make([]string, 0, len(p))
+	for _, prop := range p {
+		s := prop.String()
+
+		// Ignored empty properties.
+		if s != "" {
+			props = append(props, s)
+		}
 	}
 	return strings.Join(props, propertyDelimiter)
 }
@@ -230,6 +265,10 @@ type Member struct {
 // Notice: Consider using [NewMemberRaw] instead
 // that does not require percent-encoding of the value.
 func NewMember(key, value string, props ...Property) (Member, error) {
+	if !validateKey(key) {
+		return newInvalidMember(), fmt.Errorf("%w: %q", errInvalidKey, key)
+	}
+
 	if !validateValue(value) {
 		return newInvalidMember(), fmt.Errorf("%w: %q", errInvalidValue, value)
 	}
@@ -242,7 +281,13 @@ func NewMember(key, value string, props ...Property) (Member, error) {
 
 // NewMemberRaw returns a new Member from the passed arguments.
 //
-// The passed key must be compliant with W3C Baggage specification.
+// The passed key must be valid, non-empty UTF-8 string.
+// The passed value must be valid UTF-8 string.
+// However, the specific Propagators that are used to transmit baggage entries across
+// component boundaries may impose their own restrictions on baggage key.
+// For example, the W3C Baggage specification restricts the baggage keys to strings that
+// satisfy the token definition from RFC7230, Section 3.2.6.
+// For maximum compatibility, alphanumeric value are strongly recommended to be used as baggage key.
 func NewMemberRaw(key, value string, props ...Property) (Member, error) {
 	m := Member{
 		key:        key,
@@ -294,19 +339,45 @@ func parseMember(member string) (Member, error) {
 		return newInvalidMember(), fmt.Errorf("%w: %q", errInvalidKey, key)
 	}
 
-	val := strings.TrimSpace(v)
-	if !validateValue(val) {
+	rawVal := strings.TrimSpace(v)
+	if !validateValue(rawVal) {
 		return newInvalidMember(), fmt.Errorf("%w: %q", errInvalidValue, v)
 	}
 
 	// Decode a percent-encoded value.
-	value, err := url.PathUnescape(val)
+	unescapeVal, err := url.PathUnescape(rawVal)
 	if err != nil {
 		return newInvalidMember(), fmt.Errorf("%w: %w", errInvalidValue, err)
 	}
+
+	value := replaceInvalidUTF8Sequences(len(rawVal), unescapeVal)
 	return Member{key: key, value: value, properties: props, hasData: true}, nil
 }
 
+// replaceInvalidUTF8Sequences replaces invalid UTF-8 sequences with '<27>'.
+func replaceInvalidUTF8Sequences(cap int, unescapeVal string) string {
+	if utf8.ValidString(unescapeVal) {
+		return unescapeVal
+	}
+	// W3C baggage spec:
+	// https://github.com/w3c/baggage/blob/8c215efbeebd3fa4b1aceb937a747e56444f22f3/baggage/HTTP_HEADER_FORMAT.md?plain=1#L69
+
+	var b strings.Builder
+	b.Grow(cap)
+	for i := 0; i < len(unescapeVal); {
+		r, size := utf8.DecodeRuneInString(unescapeVal[i:])
+		if r == utf8.RuneError && size == 1 {
+			// Invalid UTF-8 sequence found, replace it with '<27>'
+			_, _ = b.WriteString("<22>")
+		} else {
+			_, _ = b.WriteRune(r)
+		}
+		i += size
+	}
+
+	return b.String()
+}
+
 // validate ensures m conforms to the W3C Baggage specification.
 // A key must be an ASCII string, returning an error otherwise.
 func (m Member) validate() error {
@@ -314,9 +385,12 @@ func (m Member) validate() error {
 		return fmt.Errorf("%w: %q", errInvalidMember, m)
 	}
 
-	if !validateKey(m.key) {
+	if !validateBaggageName(m.key) {
 		return fmt.Errorf("%w: %q", errInvalidKey, m.key)
 	}
+	if !validateBaggageValue(m.value) {
+		return fmt.Errorf("%w: %q", errInvalidValue, m.value)
+	}
 	return m.properties.validate()
 }
 
@@ -331,10 +405,15 @@ func (m Member) Properties() []Property { return m.properties.Copy() }
 
 // String encodes Member into a header string compliant with the W3C Baggage
 // specification.
+// It would return empty string if the key is invalid with the W3C Baggage
+// specification. This could happen for a UTF-8 key, as it may contain
+// invalid characters.
 func (m Member) String() string {
-	// A key is just an ASCII string. A value is restricted to be
-	// US-ASCII characters excluding CTLs, whitespace,
-	// DQUOTE, comma, semicolon, and backslash.
+	//  W3C Baggage specification does not allow percent-encoded keys.
+	if !validateKey(m.key) {
+		return ""
+	}
+
 	s := m.key + keyValueDelimiter + valueEscape(m.value)
 	if len(m.properties) > 0 {
 		s += propertyDelimiter + m.properties.String()
@@ -448,7 +527,7 @@ func (b Baggage) Member(key string) Member {
 }
 
 // Members returns all the baggage list-members.
-// The order of the returned list-members does not have significance.
+// The order of the returned list-members is not significant.
 //
 // The returned members are not validated, as we assume the validation happened
 // when they were added to the Baggage.
@@ -469,8 +548,8 @@ func (b Baggage) Members() []Member {
 	return members
 }
 
-// SetMember returns a copy the Baggage with the member included. If the
-// baggage contains a Member with the same key the existing Member is
+// SetMember returns a copy of the Baggage with the member included. If the
+// baggage contains a Member with the same key, the existing Member is
 // replaced.
 //
 // If member is invalid according to the W3C Baggage specification, an error
@@ -528,14 +607,22 @@ func (b Baggage) Len() int {
 
 // String encodes Baggage into a header string compliant with the W3C Baggage
 // specification.
+// It would ignore members where the member key is invalid with the W3C Baggage
+// specification. This could happen for a UTF-8 key, as it may contain
+// invalid characters.
 func (b Baggage) String() string {
 	members := make([]string, 0, len(b.list))
 	for k, v := range b.list {
-		members = append(members, Member{
+		s := Member{
 			key:        k,
 			value:      v.Value,
 			properties: fromInternalProperties(v.Properties),
-		}.String())
+		}.String()
+
+		// Ignored empty members.
+		if s != "" {
+			members = append(members, s)
+		}
 	}
 	return strings.Join(members, listDelimiter)
 }
@@ -607,10 +694,12 @@ func parsePropertyInternal(s string) (p Property, ok bool) {
 	}
 
 	// Decode a percent-encoded value.
-	value, err := url.PathUnescape(s[valueStart:valueEnd])
+	rawVal := s[valueStart:valueEnd]
+	unescapeVal, err := url.PathUnescape(rawVal)
 	if err != nil {
 		return
 	}
+	value := replaceInvalidUTF8Sequences(len(rawVal), unescapeVal)
 
 	ok = true
 	p.key = s[keyStart:keyEnd]
@@ -720,6 +809,24 @@ var safeKeyCharset = [utf8.RuneSelf]bool{
 	'~': true,
 }
 
+// validateBaggageName checks if the string is a valid OpenTelemetry Baggage name.
+// Baggage name is a valid, non-empty UTF-8 string.
+func validateBaggageName(s string) bool {
+	if len(s) == 0 {
+		return false
+	}
+
+	return utf8.ValidString(s)
+}
+
+// validateBaggageValue checks if the string is a valid OpenTelemetry Baggage value.
+// Baggage value is a valid UTF-8 strings.
+// Empty string is also a valid UTF-8 string.
+func validateBaggageValue(s string) bool {
+	return utf8.ValidString(s)
+}
+
+// validateKey checks if the string is a valid W3C Baggage key.
 func validateKey(s string) bool {
 	if len(s) == 0 {
 		return false
@@ -738,6 +845,7 @@ func validateKeyChar(c int32) bool {
 	return c >= 0 && c < int32(utf8.RuneSelf) && safeKeyCharset[c]
 }
 
+// validateValue checks if the string is a valid W3C Baggage value.
 func validateValue(s string) bool {
 	for _, c := range s {
 		if !validateValueChar(c) {

vendor/go.opentelemetry.io/otel/codes/codes.go

@@ -83,7 +83,7 @@ func (c *Code) UnmarshalJSON(b []byte) error {
 				return fmt.Errorf("invalid code: %q", ci)
 			}
 
-			*c = Code(ci)
+			*c = Code(ci) // nolint: gosec  // Bit size of 32 check above.
 			return nil
 		}
 		return fmt.Errorf("invalid code: %q", string(b))

vendor/go.opentelemetry.io/otel/doc.go

@@ -17,6 +17,8 @@ To read more about tracing, see go.opentelemetry.io/otel/trace.
 
 To read more about metrics, see go.opentelemetry.io/otel/metric.
 
+To read more about logs, see go.opentelemetry.io/otel/log.
+
 To read more about propagation, see go.opentelemetry.io/otel/propagation and
 go.opentelemetry.io/otel/baggage.
 */

vendor/go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/client.go

@@ -155,7 +155,12 @@ func (c *client) exportContext(parent context.Context) (context.Context, context
 	}
 
 	if c.metadata.Len() > 0 {
-		ctx = metadata.NewOutgoingContext(ctx, c.metadata)
+		md := c.metadata
+		if outMD, ok := metadata.FromOutgoingContext(ctx); ok {
+			md = metadata.Join(md, outMD)
+		}
+
+		ctx = metadata.NewOutgoingContext(ctx, md)
 	}
 
 	return ctx, cancel

vendor/go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/config.go

@@ -66,8 +66,9 @@ func WithInsecure() Option {
 //
 // If the OTEL_EXPORTER_OTLP_ENDPOINT or OTEL_EXPORTER_OTLP_METRICS_ENDPOINT
 // environment variable is set, and this option is not passed, that variable
-// value will be used. If both are set, OTEL_EXPORTER_OTLP_METRICS_ENDPOINT
-// will take precedence.
+// value will be used. If both environment variables are set,
+// OTEL_EXPORTER_OTLP_METRICS_ENDPOINT will take precedence. If an environment
+// variable is set, and this option is passed, this option will take precedence.
 //
 // If both this option and WithEndpointURL are used, the last used option will
 // take precedence.
@@ -84,8 +85,9 @@ func WithEndpoint(endpoint string) Option {
 //
 // If the OTEL_EXPORTER_OTLP_ENDPOINT or OTEL_EXPORTER_OTLP_METRICS_ENDPOINT
 // environment variable is set, and this option is not passed, that variable
-// value will be used. If both are set, OTEL_EXPORTER_OTLP_METRICS_ENDPOINT
-// will take precedence.
+// value will be used. If both environment variables are set,
+// OTEL_EXPORTER_OTLP_METRICS_ENDPOINT will take precedence. If an environment
+// variable is set, and this option is passed, this option will take precedence.
 //
 // If both this option and WithEndpoint are used, the last used option will
 // take precedence.

vendor/go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/doc.go

@@ -12,9 +12,8 @@ The environment variables described below can be used for configuration.
 OTEL_EXPORTER_OTLP_ENDPOINT, OTEL_EXPORTER_OTLP_METRICS_ENDPOINT (default: "https://localhost:4317") -
 target to which the exporter sends telemetry.
 The target syntax is defined in https://github.com/grpc/grpc/blob/master/doc/naming.md.
-The value must contain a host.
-The value may additionally a port, a scheme, and a path.
-The value accepts "http" and "https" scheme.
+The value must contain a scheme ("http" or "https") and host.
+The value may additionally contain a port, and a path.
 The value should not contain a query string or fragment.
 OTEL_EXPORTER_OTLP_METRICS_ENDPOINT takes precedence over OTEL_EXPORTER_OTLP_ENDPOINT.
 The configuration can be overridden by [WithEndpoint], [WithEndpointURL], [WithInsecure], and [WithGRPCConn] options.

vendor/go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/internal/envconfig/envconfig.go

@@ -15,6 +15,7 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode"
 
 	"go.opentelemetry.io/otel/internal/global"
 )
@@ -163,12 +164,16 @@ func stringToHeader(value string) map[string]string {
 			global.Error(errors.New("missing '="), "parse headers", "input", header)
 			continue
 		}
-		name, err := url.PathUnescape(n)
-		if err != nil {
-			global.Error(err, "escape header key", "key", n)
+
+		trimmedName := strings.TrimSpace(n)
+
+		// Validate the key.
+		if !isValidHeaderKey(trimmedName) {
+			global.Error(errors.New("invalid header key"), "parse headers", "key", trimmedName)
 			continue
 		}
-		trimmedName := strings.TrimSpace(name)
+
+		// Only decode the value.
 		value, err := url.PathUnescape(v)
 		if err != nil {
 			global.Error(err, "escape header value", "value", v)
@@ -189,3 +194,22 @@ func createCertPool(certBytes []byte) (*x509.CertPool, error) {
 	}
 	return cp, nil
 }
+
+func isValidHeaderKey(key string) bool {
+	if key == "" {
+		return false
+	}
+	for _, c := range key {
+		if !isTokenChar(c) {
+			return false
+		}
+	}
+	return true
+}
+
+func isTokenChar(c rune) bool {
+	return c <= unicode.MaxASCII && (unicode.IsLetter(c) ||
+		unicode.IsDigit(c) ||
+		c == '!' || c == '#' || c == '$' || c == '%' || c == '&' || c == '\'' || c == '*' ||
+		c == '+' || c == '-' || c == '.' || c == '^' || c == '_' || c == '`' || c == '|' || c == '~')
+}

vendor/go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/internal/oconf/options.go

@@ -139,7 +139,7 @@ func NewGRPCConfig(opts ...GRPCOption) Config {
 	if cfg.ServiceConfig != "" {
 		cfg.DialOptions = append(cfg.DialOptions, grpc.WithDefaultServiceConfig(cfg.ServiceConfig))
 	}
-	// Priroritize GRPCCredentials over Insecure (passing both is an error).
+	// Prioritize GRPCCredentials over Insecure (passing both is an error).
 	if cfg.Metrics.GRPCCredentials != nil {
 		cfg.DialOptions = append(cfg.DialOptions, grpc.WithTransportCredentials(cfg.Metrics.GRPCCredentials))
 	} else if cfg.Metrics.Insecure {
@@ -287,9 +287,7 @@ func WithEndpointURL(v string) GenericOption {
 
 		cfg.Metrics.Endpoint = u.Host
 		cfg.Metrics.URLPath = u.Path
-		if u.Scheme != "https" {
-			cfg.Metrics.Insecure = true
-		}
+		cfg.Metrics.Insecure = u.Scheme != "https"
 
 		return cfg
 	})

vendor/go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/internal/oconf/tls.go

@@ -14,7 +14,7 @@ import (
 )
 
 // ReadTLSConfigFromFile reads a PEM certificate file and creates
-// a tls.Config that will use this certifate to verify a server certificate.
+// a tls.Config that will use this certificate to verify a server certificate.
 func ReadTLSConfigFromFile(path string) (*tls.Config, error) {
 	b, err := os.ReadFile(path)
 	if err != nil {

vendor/go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/internal/transform/metricdata.go

@@ -46,8 +46,9 @@ func ScopeMetrics(sms []metricdata.ScopeMetrics) ([]*mpb.ScopeMetrics, error) {
 
 		out = append(out, &mpb.ScopeMetrics{
 			Scope: &cpb.InstrumentationScope{
-				Name:    sm.Scope.Name,
-				Version: sm.Scope.Version,
+				Name:       sm.Scope.Name,
+				Version:    sm.Scope.Version,
+				Attributes: AttrIter(sm.Scope.Attributes.Iter()),
 			},
 			Metrics:   ms,
 			SchemaUrl: sm.Scope.SchemaURL,
@@ -83,13 +84,13 @@ func metric(m metricdata.Metrics) (*mpb.Metric, error) {
 	}
 	switch a := m.Data.(type) {
 	case metricdata.Gauge[int64]:
-		out.Data = Gauge[int64](a)
+		out.Data = Gauge(a)
 	case metricdata.Gauge[float64]:
-		out.Data = Gauge[float64](a)
+		out.Data = Gauge(a)
 	case metricdata.Sum[int64]:
-		out.Data, err = Sum[int64](a)
+		out.Data, err = Sum(a)
 	case metricdata.Sum[float64]:
-		out.Data, err = Sum[float64](a)
+		out.Data, err = Sum(a)
 	case metricdata.Histogram[int64]:
 		out.Data, err = Histogram(a)
 	case metricdata.Histogram[float64]:
@@ -279,10 +280,7 @@ func Temporality(t metricdata.Temporality) (mpb.AggregationTemporality, error) {
 // timeUnixNano on the zero Time returns 0.
 // The result does not depend on the location associated with t.
 func timeUnixNano(t time.Time) uint64 {
-	if t.IsZero() {
-		return 0
-	}
-	return uint64(t.UnixNano())
+	return uint64(max(0, t.UnixNano())) // nolint:gosec // Overflow checked.
 }
 
 // Exemplars returns a slice of OTLP Exemplars generated from exemplars.

vendor/go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/version.go

@@ -5,5 +5,5 @@ package otlpmetricgrpc // import "go.opentelemetry.io/otel/exporters/otlp/otlpme
 
 // Version is the current release version of the OpenTelemetry OTLP over gRPC metrics exporter in use.
 func Version() string {
-	return "1.28.0"
+	return "1.32.0"
 }

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/tracetransform/instrumentation.go

@@ -13,7 +13,8 @@ func InstrumentationScope(il instrumentation.Scope) *commonpb.InstrumentationSco
 		return nil
 	}
 	return &commonpb.InstrumentationScope{
-		Name:    il.Name,
-		Version: il.Version,
+		Name:       il.Name,
+		Version:    il.Version,
+		Attributes: Iterator(il.Attributes.Iter()),
 	}
 }

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/tracetransform/span.go

@@ -4,6 +4,8 @@
 package tracetransform // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/tracetransform"
 
 import (
+	"math"
+
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/codes"
 	"go.opentelemetry.io/otel/sdk/instrumentation"
@@ -95,16 +97,16 @@ func span(sd tracesdk.ReadOnlySpan) *tracepb.Span {
 		SpanId:                 sid[:],
 		TraceState:             sd.SpanContext().TraceState().String(),
 		Status:                 status(sd.Status().Code, sd.Status().Description),
-		StartTimeUnixNano:      uint64(sd.StartTime().UnixNano()),
-		EndTimeUnixNano:        uint64(sd.EndTime().UnixNano()),
+		StartTimeUnixNano:      uint64(max(0, sd.StartTime().UnixNano())), // nolint:gosec // Overflow checked.
+		EndTimeUnixNano:        uint64(max(0, sd.EndTime().UnixNano())),   // nolint:gosec // Overflow checked.
 		Links:                  links(sd.Links()),
 		Kind:                   spanKind(sd.SpanKind()),
 		Name:                   sd.Name(),
 		Attributes:             KeyValues(sd.Attributes()),
 		Events:                 spanEvents(sd.Events()),
-		DroppedAttributesCount: uint32(sd.DroppedAttributes()),
-		DroppedEventsCount:     uint32(sd.DroppedEvents()),
-		DroppedLinksCount:      uint32(sd.DroppedLinks()),
+		DroppedAttributesCount: clampUint32(sd.DroppedAttributes()),
+		DroppedEventsCount:     clampUint32(sd.DroppedEvents()),
+		DroppedLinksCount:      clampUint32(sd.DroppedLinks()),
 	}
 
 	if psid := sd.Parent().SpanID(); psid.IsValid() {
@@ -115,6 +117,16 @@ func span(sd tracesdk.ReadOnlySpan) *tracepb.Span {
 	return s
 }
 
+func clampUint32(v int) uint32 {
+	if v < 0 {
+		return 0
+	}
+	if int64(v) > math.MaxUint32 {
+		return math.MaxUint32
+	}
+	return uint32(v) // nolint: gosec  // Overflow/Underflow checked.
+}
+
 // status transform a span code and message into an OTLP span status.
 func status(status codes.Code, message string) *tracepb.Status {
 	var c tracepb.Status_StatusCode
@@ -153,7 +165,7 @@ func links(links []tracesdk.Link) []*tracepb.Span_Link {
 			TraceId:                tid[:],
 			SpanId:                 sid[:],
 			Attributes:             KeyValues(otLink.Attributes),
-			DroppedAttributesCount: uint32(otLink.DroppedAttributeCount),
+			DroppedAttributesCount: clampUint32(otLink.DroppedAttributeCount),
 			Flags:                  flags,
 		})
 	}
@@ -166,7 +178,7 @@ func buildSpanFlags(sc trace.SpanContext) uint32 {
 		flags |= tracepb.SpanFlags_SPAN_FLAGS_CONTEXT_IS_REMOTE_MASK
 	}
 
-	return uint32(flags)
+	return uint32(flags) // nolint:gosec // Flags is a bitmask and can't be negative
 }
 
 // spanEvents transforms span Events to an OTLP span events.
@@ -180,9 +192,9 @@ func spanEvents(es []tracesdk.Event) []*tracepb.Span_Event {
 	for i := 0; i < len(es); i++ {
 		events[i] = &tracepb.Span_Event{
 			Name:                   es[i].Name,
-			TimeUnixNano:           uint64(es[i].Time.UnixNano()),
+			TimeUnixNano:           uint64(max(0, es[i].Time.UnixNano())), // nolint:gosec // Overflow checked.
 			Attributes:             KeyValues(es[i].Attributes),
-			DroppedAttributesCount: uint32(es[i].DroppedAttributeCount),
+			DroppedAttributesCount: clampUint32(es[i].DroppedAttributeCount),
 		}
 	}
 	return events

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc/client.go

@@ -229,7 +229,12 @@ func (c *client) exportContext(parent context.Context) (context.Context, context
 	}
 
 	if c.metadata.Len() > 0 {
-		ctx = metadata.NewOutgoingContext(ctx, c.metadata)
+		md := c.metadata
+		if outMD, ok := metadata.FromOutgoingContext(ctx); ok {
+			md = metadata.Join(md, outMD)
+		}
+
+		ctx = metadata.NewOutgoingContext(ctx, md)
 	}
 
 	// Unify the client stopCtx with the parent.

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc/doc.go

@@ -12,9 +12,8 @@ The environment variables described below can be used for configuration.
 OTEL_EXPORTER_OTLP_ENDPOINT, OTEL_EXPORTER_OTLP_TRACES_ENDPOINT (default: "https://localhost:4317") -
 target to which the exporter sends telemetry.
 The target syntax is defined in https://github.com/grpc/grpc/blob/master/doc/naming.md.
-The value must contain a host.
-The value may additionally a port, a scheme, and a path.
-The value accepts "http" and "https" scheme.
+The value must contain a scheme ("http" or "https") and host.
+The value may additionally contain a port, and a path.
 The value should not contain a query string or fragment.
 OTEL_EXPORTER_OTLP_TRACES_ENDPOINT takes precedence over OTEL_EXPORTER_OTLP_ENDPOINT.
 The configuration can be overridden by [WithEndpoint], [WithEndpointURL], [WithInsecure], and [WithGRPCConn] options.

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc/internal/envconfig/envconfig.go

@@ -15,6 +15,7 @@ import (
 	"strconv"
 	"strings"
 	"time"
+	"unicode"
 
 	"go.opentelemetry.io/otel/internal/global"
 )
@@ -163,12 +164,16 @@ func stringToHeader(value string) map[string]string {
 			global.Error(errors.New("missing '="), "parse headers", "input", header)
 			continue
 		}
-		name, err := url.PathUnescape(n)
-		if err != nil {
-			global.Error(err, "escape header key", "key", n)
+
+		trimmedName := strings.TrimSpace(n)
+
+		// Validate the key.
+		if !isValidHeaderKey(trimmedName) {
+			global.Error(errors.New("invalid header key"), "parse headers", "key", trimmedName)
 			continue
 		}
-		trimmedName := strings.TrimSpace(name)
+
+		// Only decode the value.
 		value, err := url.PathUnescape(v)
 		if err != nil {
 			global.Error(err, "escape header value", "value", v)
@@ -189,3 +194,22 @@ func createCertPool(certBytes []byte) (*x509.CertPool, error) {
 	}
 	return cp, nil
 }
+
+func isValidHeaderKey(key string) bool {
+	if key == "" {
+		return false
+	}
+	for _, c := range key {
+		if !isTokenChar(c) {
+			return false
+		}
+	}
+	return true
+}
+
+func isTokenChar(c rune) bool {
+	return c <= unicode.MaxASCII && (unicode.IsLetter(c) ||
+		unicode.IsDigit(c) ||
+		c == '!' || c == '#' || c == '$' || c == '%' || c == '&' || c == '\'' || c == '*' ||
+		c == '+' || c == '-' || c == '.' || c == '^' || c == '_' || c == '`' || c == '|' || c == '~')
+}

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc/internal/otlpconfig/options.go

@@ -125,7 +125,7 @@ func NewGRPCConfig(opts ...GRPCOption) Config {
 	if cfg.ServiceConfig != "" {
 		cfg.DialOptions = append(cfg.DialOptions, grpc.WithDefaultServiceConfig(cfg.ServiceConfig))
 	}
-	// Priroritize GRPCCredentials over Insecure (passing both is an error).
+	// Prioritize GRPCCredentials over Insecure (passing both is an error).
 	if cfg.Traces.GRPCCredentials != nil {
 		cfg.DialOptions = append(cfg.DialOptions, grpc.WithTransportCredentials(cfg.Traces.GRPCCredentials))
 	} else if cfg.Traces.Insecure {
@@ -278,9 +278,7 @@ func WithEndpointURL(v string) GenericOption {
 
 		cfg.Traces.Endpoint = u.Host
 		cfg.Traces.URLPath = u.Path
-		if u.Scheme != "https" {
-			cfg.Traces.Insecure = true
-		}
+		cfg.Traces.Insecure = u.Scheme != "https"
 
 		return cfg
 	})

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/version.go

@@ -5,5 +5,5 @@ package otlptrace // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace"
 
 // Version is the current release version of the OpenTelemetry OTLP trace exporter in use.
 func Version() string {
-	return "1.28.0"
+	return "1.32.0"
 }

vendor/go.opentelemetry.io/otel/internal/global/instruments.go

@@ -13,7 +13,7 @@ import (
 
 // unwrapper unwraps to return the underlying instrument implementation.
 type unwrapper interface {
-	Unwrap() metric.Observable
+	unwrap() metric.Observable
 }
 
 type afCounter struct {
@@ -40,7 +40,7 @@ func (i *afCounter) setDelegate(m metric.Meter) {
 	i.delegate.Store(ctr)
 }
 
-func (i *afCounter) Unwrap() metric.Observable {
+func (i *afCounter) unwrap() metric.Observable {
 	if ctr := i.delegate.Load(); ctr != nil {
 		return ctr.(metric.Float64ObservableCounter)
 	}
@@ -71,7 +71,7 @@ func (i *afUpDownCounter) setDelegate(m metric.Meter) {
 	i.delegate.Store(ctr)
 }
 
-func (i *afUpDownCounter) Unwrap() metric.Observable {
+func (i *afUpDownCounter) unwrap() metric.Observable {
 	if ctr := i.delegate.Load(); ctr != nil {
 		return ctr.(metric.Float64ObservableUpDownCounter)
 	}
@@ -102,7 +102,7 @@ func (i *afGauge) setDelegate(m metric.Meter) {
 	i.delegate.Store(ctr)
 }
 
-func (i *afGauge) Unwrap() metric.Observable {
+func (i *afGauge) unwrap() metric.Observable {
 	if ctr := i.delegate.Load(); ctr != nil {
 		return ctr.(metric.Float64ObservableGauge)
 	}
@@ -133,7 +133,7 @@ func (i *aiCounter) setDelegate(m metric.Meter) {
 	i.delegate.Store(ctr)
 }
 
-func (i *aiCounter) Unwrap() metric.Observable {
+func (i *aiCounter) unwrap() metric.Observable {
 	if ctr := i.delegate.Load(); ctr != nil {
 		return ctr.(metric.Int64ObservableCounter)
 	}
@@ -164,7 +164,7 @@ func (i *aiUpDownCounter) setDelegate(m metric.Meter) {
 	i.delegate.Store(ctr)
 }
 
-func (i *aiUpDownCounter) Unwrap() metric.Observable {
+func (i *aiUpDownCounter) unwrap() metric.Observable {
 	if ctr := i.delegate.Load(); ctr != nil {
 		return ctr.(metric.Int64ObservableUpDownCounter)
 	}
@@ -195,7 +195,7 @@ func (i *aiGauge) setDelegate(m metric.Meter) {
 	i.delegate.Store(ctr)
 }
 
-func (i *aiGauge) Unwrap() metric.Observable {
+func (i *aiGauge) unwrap() metric.Observable {
 	if ctr := i.delegate.Load(); ctr != nil {
 		return ctr.(metric.Int64ObservableGauge)
 	}

vendor/go.opentelemetry.io/otel/internal/global/meter.go

@@ -5,8 +5,9 @@ package global // import "go.opentelemetry.io/otel/internal/global"
 
 import (
 	"container/list"
+	"context"
+	"reflect"
 	"sync"
-	"sync/atomic"
 
 	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/metric/embedded"
@@ -66,6 +67,7 @@ func (p *meterProvider) Meter(name string, opts ...metric.MeterOption) metric.Me
 		name:    name,
 		version: c.InstrumentationVersion(),
 		schema:  c.SchemaURL(),
+		attrs:   c.InstrumentationAttributes(),
 	}
 
 	if p.meters == nil {
@@ -76,7 +78,7 @@ func (p *meterProvider) Meter(name string, opts ...metric.MeterOption) metric.Me
 		return val
 	}
 
-	t := &meter{name: name, opts: opts}
+	t := &meter{name: name, opts: opts, instruments: make(map[instID]delegatedInstrument)}
 	p.meters[key] = t
 	return t
 }
@@ -92,17 +94,29 @@ type meter struct {
 	opts []metric.MeterOption
 
 	mtx         sync.Mutex
-	instruments []delegatedInstrument
+	instruments map[instID]delegatedInstrument
 
 	registry list.List
 
-	delegate atomic.Value // metric.Meter
+	delegate metric.Meter
 }
 
 type delegatedInstrument interface {
 	setDelegate(metric.Meter)
 }
 
+// instID are the identifying properties of a instrument.
+type instID struct {
+	// name is the name of the stream.
+	name string
+	// description is the description of the stream.
+	description string
+	// kind defines the functional group of the instrument.
+	kind reflect.Type
+	// unit is the unit of the stream.
+	unit string
+}
+
 // setDelegate configures m to delegate all Meter functionality to Meters
 // created by provider.
 //
@@ -110,12 +124,12 @@ type delegatedInstrument interface {
 //
 // It is guaranteed by the caller that this happens only once.
 func (m *meter) setDelegate(provider metric.MeterProvider) {
-	meter := provider.Meter(m.name, m.opts...)
-	m.delegate.Store(meter)
-
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
 
+	meter := provider.Meter(m.name, m.opts...)
+	m.delegate = meter
+
 	for _, inst := range m.instruments {
 		inst.setDelegate(meter)
 	}
@@ -133,169 +147,336 @@ func (m *meter) setDelegate(provider metric.MeterProvider) {
 }
 
 func (m *meter) Int64Counter(name string, options ...metric.Int64CounterOption) (metric.Int64Counter, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Int64Counter(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Int64Counter(name, options...)
+	}
+
+	cfg := metric.NewInt64CounterConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*siCounter)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Int64Counter), nil
+	}
 	i := &siCounter{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Int64UpDownCounter(name string, options ...metric.Int64UpDownCounterOption) (metric.Int64UpDownCounter, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Int64UpDownCounter(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Int64UpDownCounter(name, options...)
+	}
+
+	cfg := metric.NewInt64UpDownCounterConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*siUpDownCounter)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Int64UpDownCounter), nil
+	}
 	i := &siUpDownCounter{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Int64Histogram(name string, options ...metric.Int64HistogramOption) (metric.Int64Histogram, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Int64Histogram(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Int64Histogram(name, options...)
+	}
+
+	cfg := metric.NewInt64HistogramConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*siHistogram)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Int64Histogram), nil
+	}
 	i := &siHistogram{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Int64Gauge(name string, options ...metric.Int64GaugeOption) (metric.Int64Gauge, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Int64Gauge(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Int64Gauge(name, options...)
+	}
+
+	cfg := metric.NewInt64GaugeConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*siGauge)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Int64Gauge), nil
+	}
 	i := &siGauge{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Int64ObservableCounter(name string, options ...metric.Int64ObservableCounterOption) (metric.Int64ObservableCounter, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Int64ObservableCounter(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Int64ObservableCounter(name, options...)
+	}
+
+	cfg := metric.NewInt64ObservableCounterConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*aiCounter)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Int64ObservableCounter), nil
+	}
 	i := &aiCounter{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Int64ObservableUpDownCounter(name string, options ...metric.Int64ObservableUpDownCounterOption) (metric.Int64ObservableUpDownCounter, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Int64ObservableUpDownCounter(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Int64ObservableUpDownCounter(name, options...)
+	}
+
+	cfg := metric.NewInt64ObservableUpDownCounterConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*aiUpDownCounter)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Int64ObservableUpDownCounter), nil
+	}
 	i := &aiUpDownCounter{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Int64ObservableGauge(name string, options ...metric.Int64ObservableGaugeOption) (metric.Int64ObservableGauge, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Int64ObservableGauge(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Int64ObservableGauge(name, options...)
+	}
+
+	cfg := metric.NewInt64ObservableGaugeConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*aiGauge)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Int64ObservableGauge), nil
+	}
 	i := &aiGauge{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Float64Counter(name string, options ...metric.Float64CounterOption) (metric.Float64Counter, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Float64Counter(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Float64Counter(name, options...)
+	}
+
+	cfg := metric.NewFloat64CounterConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*sfCounter)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Float64Counter), nil
+	}
 	i := &sfCounter{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Float64UpDownCounter(name string, options ...metric.Float64UpDownCounterOption) (metric.Float64UpDownCounter, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Float64UpDownCounter(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Float64UpDownCounter(name, options...)
+	}
+
+	cfg := metric.NewFloat64UpDownCounterConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*sfUpDownCounter)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Float64UpDownCounter), nil
+	}
 	i := &sfUpDownCounter{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Float64Histogram(name string, options ...metric.Float64HistogramOption) (metric.Float64Histogram, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Float64Histogram(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Float64Histogram(name, options...)
+	}
+
+	cfg := metric.NewFloat64HistogramConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*sfHistogram)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Float64Histogram), nil
+	}
 	i := &sfHistogram{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Float64Gauge(name string, options ...metric.Float64GaugeOption) (metric.Float64Gauge, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Float64Gauge(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Float64Gauge(name, options...)
+	}
+
+	cfg := metric.NewFloat64GaugeConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*sfGauge)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Float64Gauge), nil
+	}
 	i := &sfGauge{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Float64ObservableCounter(name string, options ...metric.Float64ObservableCounterOption) (metric.Float64ObservableCounter, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Float64ObservableCounter(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Float64ObservableCounter(name, options...)
+	}
+
+	cfg := metric.NewFloat64ObservableCounterConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*afCounter)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Float64ObservableCounter), nil
+	}
 	i := &afCounter{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Float64ObservableUpDownCounter(name string, options ...metric.Float64ObservableUpDownCounterOption) (metric.Float64ObservableUpDownCounter, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Float64ObservableUpDownCounter(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Float64ObservableUpDownCounter(name, options...)
+	}
+
+	cfg := metric.NewFloat64ObservableUpDownCounterConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*afUpDownCounter)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Float64ObservableUpDownCounter), nil
+	}
 	i := &afUpDownCounter{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 func (m *meter) Float64ObservableGauge(name string, options ...metric.Float64ObservableGaugeOption) (metric.Float64ObservableGauge, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		return del.Float64ObservableGauge(name, options...)
-	}
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
+
+	if m.delegate != nil {
+		return m.delegate.Float64ObservableGauge(name, options...)
+	}
+
+	cfg := metric.NewFloat64ObservableGaugeConfig(options...)
+	id := instID{
+		name:        name,
+		kind:        reflect.TypeOf((*afGauge)(nil)),
+		description: cfg.Description(),
+		unit:        cfg.Unit(),
+	}
+	if f, ok := m.instruments[id]; ok {
+		return f.(metric.Float64ObservableGauge), nil
+	}
 	i := &afGauge{name: name, opts: options}
-	m.instruments = append(m.instruments, i)
+	m.instruments[id] = i
 	return i, nil
 }
 
 // RegisterCallback captures the function that will be called during Collect.
 func (m *meter) RegisterCallback(f metric.Callback, insts ...metric.Observable) (metric.Registration, error) {
-	if del, ok := m.delegate.Load().(metric.Meter); ok {
-		insts = unwrapInstruments(insts)
-		return del.RegisterCallback(f, insts...)
-	}
-
 	m.mtx.Lock()
 	defer m.mtx.Unlock()
 
+	if m.delegate != nil {
+		return m.delegate.RegisterCallback(unwrapCallback(f), unwrapInstruments(insts)...)
+	}
+
 	reg := &registration{instruments: insts, function: f}
 	e := m.registry.PushBack(reg)
 	reg.unreg = func() error {
@@ -307,15 +488,11 @@ func (m *meter) RegisterCallback(f metric.Callback, insts ...metric.Observable)
 	return reg, nil
 }
 
-type wrapped interface {
-	unwrap() metric.Observable
-}
-
 func unwrapInstruments(instruments []metric.Observable) []metric.Observable {
 	out := make([]metric.Observable, 0, len(instruments))
 
 	for _, inst := range instruments {
-		if in, ok := inst.(wrapped); ok {
+		if in, ok := inst.(unwrapper); ok {
 			out = append(out, in.unwrap())
 		} else {
 			out = append(out, inst)
@@ -335,9 +512,61 @@ type registration struct {
 	unregMu sync.Mutex
 }
 
-func (c *registration) setDelegate(m metric.Meter) {
-	insts := unwrapInstruments(c.instruments)
+type unwrapObs struct {
+	embedded.Observer
+	obs metric.Observer
+}
 
+// unwrapFloat64Observable returns an expected metric.Float64Observable after
+// unwrapping the global object.
+func unwrapFloat64Observable(inst metric.Float64Observable) metric.Float64Observable {
+	if unwrapped, ok := inst.(unwrapper); ok {
+		if floatObs, ok := unwrapped.unwrap().(metric.Float64Observable); ok {
+			// Note: if the unwrapped object does not
+			// unwrap as an observable for either of the
+			// predicates here, it means an internal bug in
+			// this package.  We avoid logging an error in
+			// this case, because the SDK has to try its
+			// own type conversion on the object.  The SDK
+			// will see this and be forced to respond with
+			// its own error.
+			//
+			// This code uses a double-nested if statement
+			// to avoid creating a branch that is
+			// impossible to cover.
+			inst = floatObs
+		}
+	}
+	return inst
+}
+
+// unwrapInt64Observable returns an expected metric.Int64Observable after
+// unwrapping the global object.
+func unwrapInt64Observable(inst metric.Int64Observable) metric.Int64Observable {
+	if unwrapped, ok := inst.(unwrapper); ok {
+		if unint, ok := unwrapped.unwrap().(metric.Int64Observable); ok {
+			// See the comment in unwrapFloat64Observable().
+			inst = unint
+		}
+	}
+	return inst
+}
+
+func (uo *unwrapObs) ObserveFloat64(inst metric.Float64Observable, value float64, opts ...metric.ObserveOption) {
+	uo.obs.ObserveFloat64(unwrapFloat64Observable(inst), value, opts...)
+}
+
+func (uo *unwrapObs) ObserveInt64(inst metric.Int64Observable, value int64, opts ...metric.ObserveOption) {
+	uo.obs.ObserveInt64(unwrapInt64Observable(inst), value, opts...)
+}
+
+func unwrapCallback(f metric.Callback) metric.Callback {
+	return func(ctx context.Context, obs metric.Observer) error {
+		return f(ctx, &unwrapObs{obs: obs})
+	}
+}
+
+func (c *registration) setDelegate(m metric.Meter) {
 	c.unregMu.Lock()
 	defer c.unregMu.Unlock()
 
@@ -346,9 +575,10 @@ func (c *registration) setDelegate(m metric.Meter) {
 		return
 	}
 
-	reg, err := m.RegisterCallback(c.function, insts...)
+	reg, err := m.RegisterCallback(unwrapCallback(c.function), unwrapInstruments(c.instruments)...)
 	if err != nil {
 		GetErrorHandler().Handle(err)
+		return
 	}
 
 	c.unreg = reg.Unregister

vendor/go.opentelemetry.io/otel/internal/global/trace.go

@@ -87,6 +87,7 @@ func (p *tracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 		name:    name,
 		version: c.InstrumentationVersion(),
 		schema:  c.SchemaURL(),
+		attrs:   c.InstrumentationAttributes(),
 	}
 
 	if p.tracers == nil {
@@ -102,7 +103,12 @@ func (p *tracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 	return t
 }
 
-type il struct{ name, version, schema string }
+type il struct {
+	name    string
+	version string
+	schema  string
+	attrs   attribute.Set
+}
 
 // tracer is a placeholder for a trace.Tracer.
 //

vendor/go.opentelemetry.io/otel/internal/rawhelpers.go

@@ -20,11 +20,13 @@ func RawToBool(r uint64) bool {
 }
 
 func Int64ToRaw(i int64) uint64 {
-	return uint64(i)
+	// Assumes original was a valid int64 (overflow not checked).
+	return uint64(i) // nolint: gosec
 }
 
 func RawToInt64(r uint64) int64 {
-	return int64(r)
+	// Assumes original was a valid int64 (overflow not checked).
+	return int64(r) // nolint: gosec
 }
 
 func Float64ToRaw(f float64) uint64 {
@@ -36,9 +38,11 @@ func RawToFloat64(r uint64) float64 {
 }
 
 func RawPtrToFloat64Ptr(r *uint64) *float64 {
-	return (*float64)(unsafe.Pointer(r))
+	// Assumes original was a valid *float64 (overflow not checked).
+	return (*float64)(unsafe.Pointer(r)) // nolint: gosec
 }
 
 func RawPtrToInt64Ptr(r *uint64) *int64 {
-	return (*int64)(unsafe.Pointer(r))
+	// Assumes original was a valid *int64 (overflow not checked).
+	return (*int64)(unsafe.Pointer(r)) // nolint: gosec
 }

vendor/go.opentelemetry.io/otel/metric/asyncfloat64.go

@@ -213,7 +213,7 @@ type Float64Observer interface {
 }
 
 // Float64Callback is a function registered with a Meter that makes
-// observations for a Float64Observerable instrument it is registered with.
+// observations for a Float64Observable instrument it is registered with.
 // Calls to the Float64Observer record measurement values for the
 // Float64Observable.
 //

vendor/go.opentelemetry.io/otel/metric/asyncint64.go

@@ -212,7 +212,7 @@ type Int64Observer interface {
 }
 
 // Int64Callback is a function registered with a Meter that makes observations
-// for an Int64Observerable instrument it is registered with. Calls to the
+// for an Int64Observable instrument it is registered with. Calls to the
 // Int64Observer record measurement values for the Int64Observable.
 //
 // The function needs to complete in a finite amount of time and the deadline

vendor/go.opentelemetry.io/otel/metric/instrument.go

@@ -351,7 +351,7 @@ func WithAttributeSet(attributes attribute.Set) MeasurementOption {
 //
 //	cp := make([]attribute.KeyValue, len(attributes))
 //	copy(cp, attributes)
-//	WithAttributes(attribute.NewSet(cp...))
+//	WithAttributeSet(attribute.NewSet(cp...))
 //
 // [attribute.NewSet] may modify the passed attributes so this will make a copy
 // of attributes before creating a set in order to ensure this function is

vendor/go.opentelemetry.io/otel/metric/meter.go

@@ -52,6 +52,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Int64Counter(name string, options ...Int64CounterOption) (Int64Counter, error)
+
 	// Int64UpDownCounter returns a new Int64UpDownCounter instrument
 	// identified by name and configured with options. The instrument is used
 	// to synchronously record int64 measurements during a computational
@@ -61,6 +62,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Int64UpDownCounter(name string, options ...Int64UpDownCounterOption) (Int64UpDownCounter, error)
+
 	// Int64Histogram returns a new Int64Histogram instrument identified by
 	// name and configured with options. The instrument is used to
 	// synchronously record the distribution of int64 measurements during a
@@ -70,6 +72,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Int64Histogram(name string, options ...Int64HistogramOption) (Int64Histogram, error)
+
 	// Int64Gauge returns a new Int64Gauge instrument identified by name and
 	// configured with options. The instrument is used to synchronously record
 	// instantaneous int64 measurements during a computational operation.
@@ -78,6 +81,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Int64Gauge(name string, options ...Int64GaugeOption) (Int64Gauge, error)
+
 	// Int64ObservableCounter returns a new Int64ObservableCounter identified
 	// by name and configured with options. The instrument is used to
 	// asynchronously record increasing int64 measurements once per a
@@ -92,6 +96,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Int64ObservableCounter(name string, options ...Int64ObservableCounterOption) (Int64ObservableCounter, error)
+
 	// Int64ObservableUpDownCounter returns a new Int64ObservableUpDownCounter
 	// instrument identified by name and configured with options. The
 	// instrument is used to asynchronously record int64 measurements once per
@@ -106,6 +111,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Int64ObservableUpDownCounter(name string, options ...Int64ObservableUpDownCounterOption) (Int64ObservableUpDownCounter, error)
+
 	// Int64ObservableGauge returns a new Int64ObservableGauge instrument
 	// identified by name and configured with options. The instrument is used
 	// to asynchronously record instantaneous int64 measurements once per a
@@ -130,6 +136,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Float64Counter(name string, options ...Float64CounterOption) (Float64Counter, error)
+
 	// Float64UpDownCounter returns a new Float64UpDownCounter instrument
 	// identified by name and configured with options. The instrument is used
 	// to synchronously record float64 measurements during a computational
@@ -139,6 +146,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Float64UpDownCounter(name string, options ...Float64UpDownCounterOption) (Float64UpDownCounter, error)
+
 	// Float64Histogram returns a new Float64Histogram instrument identified by
 	// name and configured with options. The instrument is used to
 	// synchronously record the distribution of float64 measurements during a
@@ -148,6 +156,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Float64Histogram(name string, options ...Float64HistogramOption) (Float64Histogram, error)
+
 	// Float64Gauge returns a new Float64Gauge instrument identified by name and
 	// configured with options. The instrument is used to synchronously record
 	// instantaneous float64 measurements during a computational operation.
@@ -156,6 +165,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Float64Gauge(name string, options ...Float64GaugeOption) (Float64Gauge, error)
+
 	// Float64ObservableCounter returns a new Float64ObservableCounter
 	// instrument identified by name and configured with options. The
 	// instrument is used to asynchronously record increasing float64
@@ -170,6 +180,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Float64ObservableCounter(name string, options ...Float64ObservableCounterOption) (Float64ObservableCounter, error)
+
 	// Float64ObservableUpDownCounter returns a new
 	// Float64ObservableUpDownCounter instrument identified by name and
 	// configured with options. The instrument is used to asynchronously record
@@ -184,6 +195,7 @@ type Meter interface {
 	// See the Instrument Name section of the package documentation for more
 	// information.
 	Float64ObservableUpDownCounter(name string, options ...Float64ObservableUpDownCounterOption) (Float64ObservableUpDownCounter, error)
+
 	// Float64ObservableGauge returns a new Float64ObservableGauge instrument
 	// identified by name and configured with options. The instrument is used
 	// to asynchronously record instantaneous float64 measurements once per a
@@ -242,6 +254,7 @@ type Observer interface {
 
 	// ObserveFloat64 records the float64 value for obsrv.
 	ObserveFloat64(obsrv Float64Observable, value float64, opts ...ObserveOption)
+
 	// ObserveInt64 records the int64 value for obsrv.
 	ObserveInt64(obsrv Int64Observable, value int64, opts ...ObserveOption)
 }

vendor/go.opentelemetry.io/otel/renovate.json

@@ -19,6 +19,14 @@
       "matchManagers": ["gomod"],
       "matchDepTypes": ["indirect"],
       "enabled": false
+    },
+    {
+      "matchPackageNames": ["google.golang.org/genproto/googleapis/**"],
+      "groupName": "googleapis"
+    },
+    {
+      "matchPackageNames": ["golang.org/x/**"],
+      "groupName": "golang.org/x"
     }
   ]
 }

vendor/go.opentelemetry.io/otel/sdk/instrumentation/library.go

@@ -4,5 +4,6 @@
 package instrumentation // import "go.opentelemetry.io/otel/sdk/instrumentation"
 
 // Library represents the instrumentation library.
-// Deprecated: please use Scope instead.
+//
+// Deprecated: use [Scope] instead.
 type Library = Scope

vendor/go.opentelemetry.io/otel/sdk/instrumentation/scope.go

@@ -3,6 +3,8 @@
 
 package instrumentation // import "go.opentelemetry.io/otel/sdk/instrumentation"
 
+import "go.opentelemetry.io/otel/attribute"
+
 // Scope represents the instrumentation scope.
 type Scope struct {
 	// Name is the name of the instrumentation scope. This should be the
@@ -12,4 +14,6 @@ type Scope struct {
 	Version string
 	// SchemaURL of the telemetry emitted by the scope.
 	SchemaURL string
+	// Attributes of the telemetry emitted by the scope.
+	Attributes attribute.Set
 }

vendor/go.opentelemetry.io/otel/sdk/metric/config.go

@@ -5,17 +5,22 @@ package metric // import "go.opentelemetry.io/otel/sdk/metric"
 
 import (
 	"context"
-	"fmt"
+	"errors"
+	"os"
+	"strings"
 	"sync"
 
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/sdk/metric/exemplar"
 	"go.opentelemetry.io/otel/sdk/resource"
 )
 
 // config contains configuration options for a MeterProvider.
 type config struct {
-	res     *resource.Resource
-	readers []Reader
-	views   []View
+	res            *resource.Resource
+	readers        []Reader
+	views          []View
+	exemplarFilter exemplar.Filter
 }
 
 // readerSignals returns a force-flush and shutdown function for a
@@ -39,25 +44,13 @@ func (c config) readerSignals() (forceFlush, shutdown func(context.Context) erro
 // value.
 func unify(funcs []func(context.Context) error) func(context.Context) error {
 	return func(ctx context.Context) error {
-		var errs []error
+		var err error
 		for _, f := range funcs {
-			if err := f(ctx); err != nil {
-				errs = append(errs, err)
+			if e := f(ctx); e != nil {
+				err = errors.Join(err, e)
 			}
 		}
-		return unifyErrors(errs)
-	}
-}
-
-// unifyErrors combines multiple errors into a single error.
-func unifyErrors(errs []error) error {
-	switch len(errs) {
-	case 0:
-		return nil
-	case 1:
-		return errs[0]
-	default:
-		return fmt.Errorf("%v", errs)
+		return err
 	}
 }
 
@@ -75,7 +68,13 @@ func unifyShutdown(funcs []func(context.Context) error) func(context.Context) er
 
 // newConfig returns a config configured with options.
 func newConfig(options []Option) config {
-	conf := config{res: resource.Default()}
+	conf := config{
+		res:            resource.Default(),
+		exemplarFilter: exemplar.TraceBasedFilter,
+	}
+	for _, o := range meterProviderOptionsFromEnv() {
+		conf = o.apply(conf)
+	}
 	for _, o := range options {
 		conf = o.apply(conf)
 	}
@@ -103,7 +102,11 @@ func (o optionFunc) apply(conf config) config {
 // go.opentelemetry.io/otel/sdk/resource package will be used.
 func WithResource(res *resource.Resource) Option {
 	return optionFunc(func(conf config) config {
-		conf.res = res
+		var err error
+		conf.res, err = resource.Merge(resource.Environment(), res)
+		if err != nil {
+			otel.Handle(err)
+		}
 		return conf
 	})
 }
@@ -135,3 +138,35 @@ func WithView(views ...View) Option {
 		return cfg
 	})
 }
+
+// WithExemplarFilter configures the exemplar filter.
+//
+// The exemplar filter determines which measurements are offered to the
+// exemplar reservoir, but the exemplar reservoir makes the final decision of
+// whether to store an exemplar.
+//
+// By default, the [exemplar.SampledFilter]
+// is used. Exemplars can be entirely disabled by providing the
+// [exemplar.AlwaysOffFilter].
+func WithExemplarFilter(filter exemplar.Filter) Option {
+	return optionFunc(func(cfg config) config {
+		cfg.exemplarFilter = filter
+		return cfg
+	})
+}
+
+func meterProviderOptionsFromEnv() []Option {
+	var opts []Option
+	// https://github.com/open-telemetry/opentelemetry-specification/blob/d4b241f451674e8f611bb589477680341006ad2b/specification/configuration/sdk-environment-variables.md#exemplar
+	const filterEnvKey = "OTEL_METRICS_EXEMPLAR_FILTER"
+
+	switch strings.ToLower(strings.TrimSpace(os.Getenv(filterEnvKey))) {
+	case "always_on":
+		opts = append(opts, WithExemplarFilter(exemplar.AlwaysOnFilter))
+	case "always_off":
+		opts = append(opts, WithExemplarFilter(exemplar.AlwaysOffFilter))
+	case "trace_based":
+		opts = append(opts, WithExemplarFilter(exemplar.TraceBasedFilter))
+	}
+	return opts
+}

vendor/go.opentelemetry.io/otel/sdk/metric/doc.go

@@ -31,6 +31,14 @@
 // is being run on. That way when multiple instances of the code are collected
 // at a single endpoint their origin is decipherable.
 //
+// To avoid leaking memory, the SDK returns the same instrument for calls to
+// create new instruments with the same Name, Unit, and Description.
+// Importantly, callbacks provided using metric.WithFloat64Callback or
+// metric.WithInt64Callback will only apply for the first instrument created
+// with a given Name, Unit, and Description. Instead, use
+// Meter.RegisterCallback and Registration.Unregister to add and remove
+// callbacks without leaking memory.
+//
 // See [go.opentelemetry.io/otel/metric] for more information about
 // the metric API.
 //

vendor/go.opentelemetry.io/otel/sdk/metric/exemplar.go

@@ -4,51 +4,49 @@
 package metric // import "go.opentelemetry.io/otel/sdk/metric"
 
 import (
-	"os"
 	"runtime"
-	"slices"
 
-	"go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
-	"go.opentelemetry.io/otel/sdk/metric/internal/x"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/sdk/metric/exemplar"
+	"go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
 )
 
+// ExemplarReservoirProviderSelector selects the
+// [exemplar.ReservoirProvider] to use
+// based on the [Aggregation] of the metric.
+type ExemplarReservoirProviderSelector func(Aggregation) exemplar.ReservoirProvider
+
 // reservoirFunc returns the appropriately configured exemplar reservoir
-// creation func based on the passed InstrumentKind and user defined
-// environment variables.
+// creation func based on the passed InstrumentKind and filter configuration.
+func reservoirFunc[N int64 | float64](provider exemplar.ReservoirProvider, filter exemplar.Filter) func(attribute.Set) aggregate.FilteredExemplarReservoir[N] {
+	return func(attrs attribute.Set) aggregate.FilteredExemplarReservoir[N] {
+		return aggregate.NewFilteredExemplarReservoir[N](filter, provider(attrs))
+	}
+}
+
+// DefaultExemplarReservoirProviderSelector returns the default
+// [exemplar.ReservoirProvider] for the
+// provided [Aggregation].
 //
-// Note: This will only return non-nil values when the experimental exemplar
-// feature is enabled and the OTEL_METRICS_EXEMPLAR_FILTER environment variable
-// is not set to always_off.
-func reservoirFunc[N int64 | float64](agg Aggregation) func() exemplar.FilteredReservoir[N] {
-	if !x.Exemplars.Enabled() {
-		return nil
-	}
-	// https://github.com/open-telemetry/opentelemetry-specification/blob/d4b241f451674e8f611bb589477680341006ad2b/specification/configuration/sdk-environment-variables.md#exemplar
-	const filterEnvKey = "OTEL_METRICS_EXEMPLAR_FILTER"
-
-	var filter exemplar.Filter
-
-	switch os.Getenv(filterEnvKey) {
-	case "always_on":
-		filter = exemplar.AlwaysOnFilter
-	case "always_off":
-		return exemplar.Drop
-	case "trace_based":
-		fallthrough
-	default:
-		filter = exemplar.SampledFilter
-	}
-
+// For explicit bucket histograms with more than 1 bucket, it uses the
+// [exemplar.HistogramReservoirProvider].
+// For exponential histograms, it uses the
+// [exemplar.FixedSizeReservoirProvider]
+// with a size of min(20, max_buckets).
+// For all other aggregations, it uses the
+// [exemplar.FixedSizeReservoirProvider]
+// with a size equal to the number of CPUs.
+//
+// Exemplar default reservoirs MAY change in a minor version bump. No
+// guarantees are made on the shape or statistical properties of returned
+// exemplars.
+func DefaultExemplarReservoirProviderSelector(agg Aggregation) exemplar.ReservoirProvider {
 	// https://github.com/open-telemetry/opentelemetry-specification/blob/d4b241f451674e8f611bb589477680341006ad2b/specification/metrics/sdk.md#exemplar-defaults
 	// Explicit bucket histogram aggregation with more than 1 bucket will
 	// use AlignedHistogramBucketExemplarReservoir.
 	a, ok := agg.(AggregationExplicitBucketHistogram)
 	if ok && len(a.Boundaries) > 0 {
-		cp := slices.Clone(a.Boundaries)
-		return func() exemplar.FilteredReservoir[N] {
-			bounds := cp
-			return exemplar.NewFilteredReservoir[N](filter, exemplar.Histogram(bounds))
-		}
+		return exemplar.HistogramReservoirProvider(a.Boundaries)
 	}
 
 	var n int
@@ -75,7 +73,5 @@ func reservoirFunc[N int64 | float64](agg Aggregation) func() exemplar.FilteredR
 		}
 	}
 
-	return func() exemplar.FilteredReservoir[N] {
-		return exemplar.NewFilteredReservoir[N](filter, exemplar.FixedSize(n))
-	}
+	return exemplar.FixedSizeReservoirProvider(n)
 }

vendor/go.opentelemetry.io/otel/sdk/metric/exemplar/README.md

@@ -0,0 +1,3 @@
+# Metric SDK Exemplars
+
+[![PkgGoDev](https://pkg.go.dev/badge/go.opentelemetry.io/otel/sdk/metric/exemplar)](https://pkg.go.dev/go.opentelemetry.io/otel/sdk/metric/exemplar)

vendor/go.opentelemetry.io/otel/sdk/metric/exemplar/doc.go

@@ -3,4 +3,4 @@
 
 // Package exemplar provides an implementation of the OpenTelemetry exemplar
 // reservoir to be used in metric collection pipelines.
-package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
+package exemplar // import "go.opentelemetry.io/otel/sdk/metric/exemplar"

vendor/go.opentelemetry.io/otel/sdk/metric/exemplar/exemplar.go

@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
+package exemplar // import "go.opentelemetry.io/otel/sdk/metric/exemplar"
 
 import (
 	"time"

vendor/go.opentelemetry.io/otel/sdk/metric/exemplar/filter.go

@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
+package exemplar // import "go.opentelemetry.io/otel/sdk/metric/exemplar"
 
 import (
 	"context"
@@ -16,10 +16,10 @@ import (
 // Reservoir in making a sampling decision.
 type Filter func(context.Context) bool
 
-// SampledFilter is a [Filter] that will only offer measurements
+// TraceBasedFilter is a [Filter] that will only offer measurements
 // if the passed context associated with the measurement contains a sampled
 // [go.opentelemetry.io/otel/trace.SpanContext].
-func SampledFilter(ctx context.Context) bool {
+func TraceBasedFilter(ctx context.Context) bool {
 	return trace.SpanContextFromContext(ctx).IsSampled()
 }
 
@@ -27,3 +27,8 @@ func SampledFilter(ctx context.Context) bool {
 func AlwaysOnFilter(ctx context.Context) bool {
 	return true
 }
+
+// AlwaysOffFilter is a [Filter] that never offers measurements.
+func AlwaysOffFilter(ctx context.Context) bool {
+	return false
+}

vendor/go.opentelemetry.io/otel/sdk/metric/exemplar/fixed_size_reservoir.go

@@ -1,31 +1,69 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
+package exemplar // import "go.opentelemetry.io/otel/sdk/metric/exemplar"
 
 import (
 	"context"
 	"math"
 	"math/rand"
-	"sync"
 	"time"
 
 	"go.opentelemetry.io/otel/attribute"
 )
 
-var (
+// FixedSizeReservoirProvider returns a provider of [FixedSizeReservoir].
+func FixedSizeReservoirProvider(k int) ReservoirProvider {
+	return func(_ attribute.Set) Reservoir {
+		return NewFixedSizeReservoir(k)
+	}
+}
+
+// NewFixedSizeReservoir returns a [FixedSizeReservoir] that samples at most
+// k exemplars. If there are k or less measurements made, the Reservoir will
+// sample each one. If there are more than k, the Reservoir will then randomly
+// sample all additional measurement with a decreasing probability.
+func NewFixedSizeReservoir(k int) *FixedSizeReservoir {
+	return newFixedSizeReservoir(newStorage(k))
+}
+
+var _ Reservoir = &FixedSizeReservoir{}
+
+// FixedSizeReservoir is a [Reservoir] that samples at most k exemplars. If
+// there are k or less measurements made, the Reservoir will sample each one.
+// If there are more than k, the Reservoir will then randomly sample all
+// additional measurement with a decreasing probability.
+type FixedSizeReservoir struct {
+	*storage
+
+	// count is the number of measurement seen.
+	count int64
+	// next is the next count that will store a measurement at a random index
+	// once the reservoir has been filled.
+	next int64
+	// w is the largest random number in a distribution that is used to compute
+	// the next next.
+	w float64
+
 	// rng is used to make sampling decisions.
 	//
 	// Do not use crypto/rand. There is no reason for the decrease in performance
 	// given this is not a security sensitive decision.
-	rng = rand.New(rand.NewSource(time.Now().UnixNano()))
-	// Ensure concurrent safe accecess to rng and its underlying source.
-	rngMu sync.Mutex
-)
+	rng *rand.Rand
+}
 
-// random returns, as a float64, a uniform pseudo-random number in the open
-// interval (0.0,1.0).
-func random() float64 {
+func newFixedSizeReservoir(s *storage) *FixedSizeReservoir {
+	r := &FixedSizeReservoir{
+		storage: s,
+		rng:     rand.New(rand.NewSource(time.Now().UnixNano())),
+	}
+	r.reset()
+	return r
+}
+
+// randomFloat64 returns, as a float64, a uniform pseudo-random number in the
+// open interval (0.0,1.0).
+func (r *FixedSizeReservoir) randomFloat64() float64 {
 	// TODO: This does not return a uniform number. rng.Float64 returns a
 	// uniformly random int in [0,2^53) that is divided by 2^53. Meaning it
 	// returns multiples of 2^-53, and not all floating point numbers between 0
@@ -43,40 +81,25 @@ func random() float64 {
 	//
 	// There are likely many other methods to explore here as well.
 
-	rngMu.Lock()
-	defer rngMu.Unlock()
-
-	f := rng.Float64()
+	f := r.rng.Float64()
 	for f == 0 {
-		f = rng.Float64()
+		f = r.rng.Float64()
 	}
 	return f
 }
 
-// FixedSize returns a [Reservoir] that samples at most k exemplars. If there
-// are k or less measurements made, the Reservoir will sample each one. If
-// there are more than k, the Reservoir will then randomly sample all
-// additional measurement with a decreasing probability.
-func FixedSize(k int) Reservoir {
-	r := &randRes{storage: newStorage(k)}
-	r.reset()
-	return r
-}
-
-type randRes struct {
-	*storage
-
-	// count is the number of measurement seen.
-	count int64
-	// next is the next count that will store a measurement at a random index
-	// once the reservoir has been filled.
-	next int64
-	// w is the largest random number in a distribution that is used to compute
-	// the next next.
-	w float64
-}
-
-func (r *randRes) Offer(ctx context.Context, t time.Time, n Value, a []attribute.KeyValue) {
+// Offer accepts the parameters associated with a measurement. The
+// parameters will be stored as an exemplar if the Reservoir decides to
+// sample the measurement.
+//
+// The passed ctx needs to contain any baggage or span that were active
+// when the measurement was made. This information may be used by the
+// Reservoir in making a sampling decision.
+//
+// The time t is the time when the measurement was made. The v and a
+// parameters are the value and dropped (filtered) attributes of the
+// measurement respectively.
+func (r *FixedSizeReservoir) Offer(ctx context.Context, t time.Time, n Value, a []attribute.KeyValue) {
 	// The following algorithm is "Algorithm L" from Li, Kim-Hung (4 December
 	// 1994). "Reservoir-Sampling Algorithms of Time Complexity
 	// O(n(1+log(N/n)))". ACM Transactions on Mathematical Software. 20 (4):
@@ -123,7 +146,7 @@ func (r *randRes) Offer(ctx context.Context, t time.Time, n Value, a []attribute
 	} else {
 		if r.count == r.next {
 			// Overwrite a random existing measurement with the one offered.
-			idx := int(rng.Int63n(int64(cap(r.store))))
+			idx := int(r.rng.Int63n(int64(cap(r.store))))
 			r.store[idx] = newMeasurement(ctx, t, n, a)
 			r.advance()
 		}
@@ -132,7 +155,7 @@ func (r *randRes) Offer(ctx context.Context, t time.Time, n Value, a []attribute
 }
 
 // reset resets r to the initial state.
-func (r *randRes) reset() {
+func (r *FixedSizeReservoir) reset() {
 	// This resets the number of exemplars known.
 	r.count = 0
 	// Random index inserts should only happen after the storage is full.
@@ -147,14 +170,14 @@ func (r *randRes) reset() {
 	// This maps the uniform random number in (0,1) to a geometric distribution
 	// over the same interval. The mean of the distribution is inversely
 	// proportional to the storage capacity.
-	r.w = math.Exp(math.Log(random()) / float64(cap(r.store)))
+	r.w = math.Exp(math.Log(r.randomFloat64()) / float64(cap(r.store)))
 
 	r.advance()
 }
 
 // advance updates the count at which the offered measurement will overwrite an
 // existing exemplar.
-func (r *randRes) advance() {
+func (r *FixedSizeReservoir) advance() {
 	// Calculate the next value in the random number series.
 	//
 	// The current value of r.w is based on the max of a distribution of random
@@ -167,7 +190,7 @@ func (r *randRes) advance() {
 	// therefore the next r.w will be based on the same distribution (i.e.
 	// `max(u_1,u_2,...,u_k)`). Therefore, we can sample the next r.w by
 	// computing the next random number `u` and take r.w as `w * u^(1/k)`.
-	r.w *= math.Exp(math.Log(random()) / float64(cap(r.store)))
+	r.w *= math.Exp(math.Log(r.randomFloat64()) / float64(cap(r.store)))
 	// Use the new random number in the series to calculate the count of the
 	// next measurement that will be stored.
 	//
@@ -178,10 +201,13 @@ func (r *randRes) advance() {
 	//
 	// Important to note, the new r.next will always be at least 1 more than
 	// the last r.next.
-	r.next += int64(math.Log(random())/math.Log(1-r.w)) + 1
+	r.next += int64(math.Log(r.randomFloat64())/math.Log(1-r.w)) + 1
 }
 
-func (r *randRes) Collect(dest *[]Exemplar) {
+// Collect returns all the held exemplars.
+//
+// The Reservoir state is preserved after this call.
+func (r *FixedSizeReservoir) Collect(dest *[]Exemplar) {
 	r.storage.Collect(dest)
 	// Call reset here even though it will reset r.count and restart the random
 	// number series. This will persist any old exemplars as long as no new

vendor/go.opentelemetry.io/otel/sdk/metric/exemplar/histogram_reservoir.go

@@ -0,0 +1,70 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package exemplar // import "go.opentelemetry.io/otel/sdk/metric/exemplar"
+
+import (
+	"context"
+	"slices"
+	"sort"
+	"time"
+
+	"go.opentelemetry.io/otel/attribute"
+)
+
+// HistogramReservoirProvider is a provider of [HistogramReservoir].
+func HistogramReservoirProvider(bounds []float64) ReservoirProvider {
+	cp := slices.Clone(bounds)
+	slices.Sort(cp)
+	return func(_ attribute.Set) Reservoir {
+		return NewHistogramReservoir(cp)
+	}
+}
+
+// NewHistogramReservoir returns a [HistogramReservoir] that samples the last
+// measurement that falls within a histogram bucket. The histogram bucket
+// upper-boundaries are define by bounds.
+//
+// The passed bounds must be sorted before calling this function.
+func NewHistogramReservoir(bounds []float64) *HistogramReservoir {
+	return &HistogramReservoir{
+		bounds:  bounds,
+		storage: newStorage(len(bounds) + 1),
+	}
+}
+
+var _ Reservoir = &HistogramReservoir{}
+
+// HistogramReservoir is a [Reservoir] that samples the last measurement that
+// falls within a histogram bucket. The histogram bucket upper-boundaries are
+// define by bounds.
+type HistogramReservoir struct {
+	*storage
+
+	// bounds are bucket bounds in ascending order.
+	bounds []float64
+}
+
+// Offer accepts the parameters associated with a measurement. The
+// parameters will be stored as an exemplar if the Reservoir decides to
+// sample the measurement.
+//
+// The passed ctx needs to contain any baggage or span that were active
+// when the measurement was made. This information may be used by the
+// Reservoir in making a sampling decision.
+//
+// The time t is the time when the measurement was made. The v and a
+// parameters are the value and dropped (filtered) attributes of the
+// measurement respectively.
+func (r *HistogramReservoir) Offer(ctx context.Context, t time.Time, v Value, a []attribute.KeyValue) {
+	var x float64
+	switch v.Type() {
+	case Int64ValueType:
+		x = float64(v.Int64())
+	case Float64ValueType:
+		x = v.Float64()
+	default:
+		panic("unknown value type")
+	}
+	r.store[sort.SearchFloat64s(r.bounds, x)] = newMeasurement(ctx, t, v, a)
+}

vendor/go.opentelemetry.io/otel/sdk/metric/exemplar/reservoir.go

@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
+package exemplar // import "go.opentelemetry.io/otel/sdk/metric/exemplar"
 
 import (
 	"context"
@@ -30,3 +30,11 @@ type Reservoir interface {
 	// The Reservoir state is preserved after this call.
 	Collect(dest *[]Exemplar)
 }
+
+// ReservoirProvider creates new [Reservoir]s.
+//
+// The attributes provided are attributes which are kept by the aggregation, and
+// are exclusive with attributes passed to Offer. The combination of these
+// attributes and the attributes passed to Offer is the complete set of
+// attributes a measurement was made with.
+type ReservoirProvider func(attr attribute.Set) Reservoir

vendor/go.opentelemetry.io/otel/sdk/metric/exemplar/storage.go

@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
+package exemplar // import "go.opentelemetry.io/otel/sdk/metric/exemplar"
 
 import (
 	"context"
@@ -35,7 +35,7 @@ func (r *storage) Collect(dest *[]Exemplar) {
 			continue
 		}
 
-		m.Exemplar(&(*dest)[n])
+		m.exemplar(&(*dest)[n])
 		n++
 	}
 	*dest = (*dest)[:n]
@@ -66,8 +66,8 @@ func newMeasurement(ctx context.Context, ts time.Time, v Value, droppedAttr []at
 	}
 }
 
-// Exemplar returns m as an [Exemplar].
-func (m measurement) Exemplar(dest *Exemplar) {
+// exemplar returns m as an [Exemplar].
+func (m measurement) exemplar(dest *Exemplar) {
 	dest.FilteredAttributes = m.FilteredAttributes
 	dest.Time = m.Time
 	dest.Value = m.Value

vendor/go.opentelemetry.io/otel/sdk/metric/exemplar/value.go

@@ -1,7 +1,7 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
+package exemplar // import "go.opentelemetry.io/otel/sdk/metric/exemplar"
 
 import "math"
 
@@ -28,7 +28,8 @@ type Value struct {
 func NewValue[N int64 | float64](value N) Value {
 	switch v := any(value).(type) {
 	case int64:
-		return Value{t: Int64ValueType, val: uint64(v)}
+		// This can be later converted back to int64 (overflow not checked).
+		return Value{t: Int64ValueType, val: uint64(v)} // nolint:gosec
 	case float64:
 		return Value{t: Float64ValueType, val: math.Float64bits(v)}
 	}
@@ -42,7 +43,8 @@ func (v Value) Type() ValueType { return v.t }
 // Int64ValueType, 0 is returned.
 func (v Value) Int64() int64 {
 	if v.t == Int64ValueType {
-		return int64(v.val)
+		// Assumes the correct int64 was stored in v.val based on type.
+		return int64(v.val) // nolint: gosec
 	}
 	return 0
 }

vendor/go.opentelemetry.io/otel/sdk/metric/instrument.go

@@ -144,6 +144,12 @@ type Stream struct {
 	// Use NewAllowKeysFilter from "go.opentelemetry.io/otel/attribute" to
 	// provide an allow-list of attribute keys here.
 	AttributeFilter attribute.Filter
+	// ExemplarReservoirProvider selects the
+	// [go.opentelemetry.io/otel/sdk/metric/exemplar.ReservoirProvider] based
+	// on the [Aggregation].
+	//
+	// If unspecified, [DefaultExemplarReservoirProviderSelector] is used.
+	ExemplarReservoirProviderSelector ExemplarReservoirProviderSelector
 }
 
 // instID are the identifying properties of a instrument.
@@ -234,8 +240,8 @@ func (i *float64Inst) aggregate(ctx context.Context, val float64, s attribute.Se
 	}
 }
 
-// observablID is a comparable unique identifier of an observable.
-type observablID[N int64 | float64] struct {
+// observableID is a comparable unique identifier of an observable.
+type observableID[N int64 | float64] struct {
 	name        string
 	description string
 	kind        InstrumentKind
@@ -287,7 +293,7 @@ func newInt64Observable(m *meter, kind InstrumentKind, name, desc, u string) int
 
 type observable[N int64 | float64] struct {
 	metric.Observable
-	observablID[N]
+	observableID[N]
 
 	meter           *meter
 	measures        measures[N]
@@ -296,7 +302,7 @@ type observable[N int64 | float64] struct {
 
 func newObservable[N int64 | float64](m *meter, kind InstrumentKind, name, desc, u string) *observable[N] {
 	return &observable[N]{
-		observablID: observablID[N]{
+		observableID: observableID[N]{
 			name:        name,
 			description: desc,
 			kind:        kind,

vendor/go.opentelemetry.io/otel/sdk/metric/internal/aggregate/aggregate.go

@@ -8,7 +8,6 @@ import (
 	"time"
 
 	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
 	"go.opentelemetry.io/otel/sdk/metric/metricdata"
 )
 
@@ -38,8 +37,8 @@ type Builder[N int64 | float64] struct {
 	// create new exemplar reservoirs for a new seen attribute set.
 	//
 	// If this is not provided a default factory function that returns an
-	// exemplar.Drop reservoir will be used.
-	ReservoirFunc func() exemplar.FilteredReservoir[N]
+	// dropReservoir reservoir will be used.
+	ReservoirFunc func(attribute.Set) FilteredExemplarReservoir[N]
 	// AggregationLimit is the cardinality limit of measurement attributes. Any
 	// measurement for new attributes once the limit has been reached will be
 	// aggregated into a single aggregate for the "otel.metric.overflow"
@@ -50,12 +49,12 @@ type Builder[N int64 | float64] struct {
 	AggregationLimit int
 }
 
-func (b Builder[N]) resFunc() func() exemplar.FilteredReservoir[N] {
+func (b Builder[N]) resFunc() func(attribute.Set) FilteredExemplarReservoir[N] {
 	if b.ReservoirFunc != nil {
 		return b.ReservoirFunc
 	}
 
-	return exemplar.Drop
+	return dropReservoir
 }
 
 type fltrMeasure[N int64 | float64] func(ctx context.Context, value N, fltrAttr attribute.Set, droppedAttr []attribute.KeyValue)

vendor/go.opentelemetry.io/otel/sdk/metric/internal/aggregate/drop.go

@@ -0,0 +1,27 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package aggregate // import "go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
+
+import (
+	"context"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/sdk/metric/exemplar"
+)
+
+// dropReservoir returns a [FilteredReservoir] that drops all measurements it is offered.
+func dropReservoir[N int64 | float64](attribute.Set) FilteredExemplarReservoir[N] {
+	return &dropRes[N]{}
+}
+
+type dropRes[N int64 | float64] struct{}
+
+// Offer does nothing, all measurements offered will be dropped.
+func (r *dropRes[N]) Offer(context.Context, N, []attribute.KeyValue) {}
+
+// Collect resets dest. No exemplars will ever be returned.
+func (r *dropRes[N]) Collect(dest *[]exemplar.Exemplar) {
+	clear(*dest) // Erase elements to let GC collect objects
+	*dest = (*dest)[:0]
+}

vendor/go.opentelemetry.io/otel/sdk/metric/internal/aggregate/exemplar.go

@@ -6,7 +6,7 @@ package aggregate // import "go.opentelemetry.io/otel/sdk/metric/internal/aggreg
 import (
 	"sync"
 
-	"go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
+	"go.opentelemetry.io/otel/sdk/metric/exemplar"
 	"go.opentelemetry.io/otel/sdk/metric/metricdata"
 )
 
@@ -17,6 +17,7 @@ var exemplarPool = sync.Pool{
 func collectExemplars[N int64 | float64](out *[]metricdata.Exemplar[N], f func(*[]exemplar.Exemplar)) {
 	dest := exemplarPool.Get().(*[]exemplar.Exemplar)
 	defer func() {
+		clear(*dest) // Erase elements to let GC collect objects.
 		*dest = (*dest)[:0]
 		exemplarPool.Put(dest)
 	}()

vendor/go.opentelemetry.io/otel/sdk/metric/internal/aggregate/exponential_histogram.go

@@ -12,7 +12,6 @@ import (
 
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
 	"go.opentelemetry.io/otel/sdk/metric/metricdata"
 )
 
@@ -31,7 +30,7 @@ const (
 // expoHistogramDataPoint is a single data point in an exponential histogram.
 type expoHistogramDataPoint[N int64 | float64] struct {
 	attrs attribute.Set
-	res   exemplar.FilteredReservoir[N]
+	res   FilteredExemplarReservoir[N]
 
 	count uint64
 	min   N
@@ -42,14 +41,14 @@ type expoHistogramDataPoint[N int64 | float64] struct {
 	noMinMax bool
 	noSum    bool
 
-	scale int
+	scale int32
 
 	posBuckets expoBuckets
 	negBuckets expoBuckets
 	zeroCount  uint64
 }
 
-func newExpoHistogramDataPoint[N int64 | float64](attrs attribute.Set, maxSize, maxScale int, noMinMax, noSum bool) *expoHistogramDataPoint[N] {
+func newExpoHistogramDataPoint[N int64 | float64](attrs attribute.Set, maxSize int, maxScale int32, noMinMax, noSum bool) *expoHistogramDataPoint[N] {
 	f := math.MaxFloat64
 	max := N(f) // if N is int64, max will overflow to -9223372036854775808
 	min := N(-f)
@@ -119,11 +118,13 @@ func (p *expoHistogramDataPoint[N]) record(v N) {
 }
 
 // getBin returns the bin v should be recorded into.
-func (p *expoHistogramDataPoint[N]) getBin(v float64) int {
-	frac, exp := math.Frexp(v)
+func (p *expoHistogramDataPoint[N]) getBin(v float64) int32 {
+	frac, expInt := math.Frexp(v)
+	// 11-bit exponential.
+	exp := int32(expInt) // nolint: gosec
 	if p.scale <= 0 {
 		// Because of the choice of fraction is always 1 power of two higher than we want.
-		correction := 1
+		var correction int32 = 1
 		if frac == .5 {
 			// If v is an exact power of two the frac will be .5 and the exp
 			// will be one higher than we want.
@@ -131,7 +132,7 @@ func (p *expoHistogramDataPoint[N]) getBin(v float64) int {
 		}
 		return (exp - correction) >> (-p.scale)
 	}
-	return exp<<p.scale + int(math.Log(frac)*scaleFactors[p.scale]) - 1
+	return exp<<p.scale + int32(math.Log(frac)*scaleFactors[p.scale]) - 1
 }
 
 // scaleFactors are constants used in calculating the logarithm index. They are
@@ -162,20 +163,20 @@ var scaleFactors = [21]float64{
 
 // scaleChange returns the magnitude of the scale change needed to fit bin in
 // the bucket. If no scale change is needed 0 is returned.
-func (p *expoHistogramDataPoint[N]) scaleChange(bin, startBin, length int) int {
+func (p *expoHistogramDataPoint[N]) scaleChange(bin, startBin int32, length int) int32 {
 	if length == 0 {
 		// No need to rescale if there are no buckets.
 		return 0
 	}
 
-	low := startBin
-	high := bin
+	low := int(startBin)
+	high := int(bin)
 	if startBin >= bin {
-		low = bin
-		high = startBin + length - 1
+		low = int(bin)
+		high = int(startBin) + length - 1
 	}
 
-	count := 0
+	var count int32
 	for high-low >= p.maxSize {
 		low = low >> 1
 		high = high >> 1
@@ -189,39 +190,39 @@ func (p *expoHistogramDataPoint[N]) scaleChange(bin, startBin, length int) int {
 
 // expoBuckets is a set of buckets in an exponential histogram.
 type expoBuckets struct {
-	startBin int
+	startBin int32
 	counts   []uint64
 }
 
 // record increments the count for the given bin, and expands the buckets if needed.
 // Size changes must be done before calling this function.
-func (b *expoBuckets) record(bin int) {
+func (b *expoBuckets) record(bin int32) {
 	if len(b.counts) == 0 {
 		b.counts = []uint64{1}
 		b.startBin = bin
 		return
 	}
 
-	endBin := b.startBin + len(b.counts) - 1
+	endBin := int(b.startBin) + len(b.counts) - 1
 
 	// if the new bin is inside the current range
-	if bin >= b.startBin && bin <= endBin {
+	if bin >= b.startBin && int(bin) <= endBin {
 		b.counts[bin-b.startBin]++
 		return
 	}
 	// if the new bin is before the current start add spaces to the counts
 	if bin < b.startBin {
 		origLen := len(b.counts)
-		newLength := endBin - bin + 1
+		newLength := endBin - int(bin) + 1
 		shift := b.startBin - bin
 
 		if newLength > cap(b.counts) {
 			b.counts = append(b.counts, make([]uint64, newLength-len(b.counts))...)
 		}
 
-		copy(b.counts[shift:origLen+shift], b.counts[:])
+		copy(b.counts[shift:origLen+int(shift)], b.counts[:])
 		b.counts = b.counts[:newLength]
-		for i := 1; i < shift; i++ {
+		for i := 1; i < int(shift); i++ {
 			b.counts[i] = 0
 		}
 		b.startBin = bin
@@ -229,17 +230,17 @@ func (b *expoBuckets) record(bin int) {
 		return
 	}
 	// if the new is after the end add spaces to the end
-	if bin > endBin {
-		if bin-b.startBin < cap(b.counts) {
+	if int(bin) > endBin {
+		if int(bin-b.startBin) < cap(b.counts) {
 			b.counts = b.counts[:bin-b.startBin+1]
-			for i := endBin + 1 - b.startBin; i < len(b.counts); i++ {
+			for i := endBin + 1 - int(b.startBin); i < len(b.counts); i++ {
 				b.counts[i] = 0
 			}
 			b.counts[bin-b.startBin] = 1
 			return
 		}
 
-		end := make([]uint64, bin-b.startBin-len(b.counts)+1)
+		end := make([]uint64, int(bin-b.startBin)-len(b.counts)+1)
 		b.counts = append(b.counts, end...)
 		b.counts[bin-b.startBin] = 1
 	}
@@ -247,7 +248,7 @@ func (b *expoBuckets) record(bin int) {
 
 // downscale shrinks a bucket by a factor of 2*s. It will sum counts into the
 // correct lower resolution bucket.
-func (b *expoBuckets) downscale(delta int) {
+func (b *expoBuckets) downscale(delta int32) {
 	// Example
 	// delta = 2
 	// Original offset: -6
@@ -262,19 +263,19 @@ func (b *expoBuckets) downscale(delta int) {
 		return
 	}
 
-	steps := 1 << delta
+	steps := int32(1) << delta
 	offset := b.startBin % steps
 	offset = (offset + steps) % steps // to make offset positive
 	for i := 1; i < len(b.counts); i++ {
-		idx := i + offset
-		if idx%steps == 0 {
-			b.counts[idx/steps] = b.counts[i]
+		idx := i + int(offset)
+		if idx%int(steps) == 0 {
+			b.counts[idx/int(steps)] = b.counts[i]
 			continue
 		}
-		b.counts[idx/steps] += b.counts[i]
+		b.counts[idx/int(steps)] += b.counts[i]
 	}
 
-	lastIdx := (len(b.counts) - 1 + offset) / steps
+	lastIdx := (len(b.counts) - 1 + int(offset)) / int(steps)
 	b.counts = b.counts[:lastIdx+1]
 	b.startBin = b.startBin >> delta
 }
@@ -282,12 +283,12 @@ func (b *expoBuckets) downscale(delta int) {
 // newExponentialHistogram returns an Aggregator that summarizes a set of
 // measurements as an exponential histogram. Each histogram is scoped by attributes
 // and the aggregation cycle the measurements were made in.
-func newExponentialHistogram[N int64 | float64](maxSize, maxScale int32, noMinMax, noSum bool, limit int, r func() exemplar.FilteredReservoir[N]) *expoHistogram[N] {
+func newExponentialHistogram[N int64 | float64](maxSize, maxScale int32, noMinMax, noSum bool, limit int, r func(attribute.Set) FilteredExemplarReservoir[N]) *expoHistogram[N] {
 	return &expoHistogram[N]{
 		noSum:    noSum,
 		noMinMax: noMinMax,
 		maxSize:  int(maxSize),
-		maxScale: int(maxScale),
+		maxScale: maxScale,
 
 		newRes: r,
 		limit:  newLimiter[*expoHistogramDataPoint[N]](limit),
@@ -303,9 +304,9 @@ type expoHistogram[N int64 | float64] struct {
 	noSum    bool
 	noMinMax bool
 	maxSize  int
-	maxScale int
+	maxScale int32
 
-	newRes   func() exemplar.FilteredReservoir[N]
+	newRes   func(attribute.Set) FilteredExemplarReservoir[N]
 	limit    limiter[*expoHistogramDataPoint[N]]
 	values   map[attribute.Distinct]*expoHistogramDataPoint[N]
 	valuesMu sync.Mutex
@@ -326,7 +327,7 @@ func (e *expoHistogram[N]) measure(ctx context.Context, value N, fltrAttr attrib
 	v, ok := e.values[attr.Equivalent()]
 	if !ok {
 		v = newExpoHistogramDataPoint[N](attr, e.maxSize, e.maxScale, e.noMinMax, e.noSum)
-		v.res = e.newRes()
+		v.res = e.newRes(attr)
 
 		e.values[attr.Equivalent()] = v
 	}
@@ -354,15 +355,15 @@ func (e *expoHistogram[N]) delta(dest *metricdata.Aggregation) int {
 		hDPts[i].StartTime = e.start
 		hDPts[i].Time = t
 		hDPts[i].Count = val.count
-		hDPts[i].Scale = int32(val.scale)
+		hDPts[i].Scale = val.scale
 		hDPts[i].ZeroCount = val.zeroCount
 		hDPts[i].ZeroThreshold = 0.0
 
-		hDPts[i].PositiveBucket.Offset = int32(val.posBuckets.startBin)
+		hDPts[i].PositiveBucket.Offset = val.posBuckets.startBin
 		hDPts[i].PositiveBucket.Counts = reset(hDPts[i].PositiveBucket.Counts, len(val.posBuckets.counts), len(val.posBuckets.counts))
 		copy(hDPts[i].PositiveBucket.Counts, val.posBuckets.counts)
 
-		hDPts[i].NegativeBucket.Offset = int32(val.negBuckets.startBin)
+		hDPts[i].NegativeBucket.Offset = val.negBuckets.startBin
 		hDPts[i].NegativeBucket.Counts = reset(hDPts[i].NegativeBucket.Counts, len(val.negBuckets.counts), len(val.negBuckets.counts))
 		copy(hDPts[i].NegativeBucket.Counts, val.negBuckets.counts)
 
@@ -407,15 +408,15 @@ func (e *expoHistogram[N]) cumulative(dest *metricdata.Aggregation) int {
 		hDPts[i].StartTime = e.start
 		hDPts[i].Time = t
 		hDPts[i].Count = val.count
-		hDPts[i].Scale = int32(val.scale)
+		hDPts[i].Scale = val.scale
 		hDPts[i].ZeroCount = val.zeroCount
 		hDPts[i].ZeroThreshold = 0.0
 
-		hDPts[i].PositiveBucket.Offset = int32(val.posBuckets.startBin)
+		hDPts[i].PositiveBucket.Offset = val.posBuckets.startBin
 		hDPts[i].PositiveBucket.Counts = reset(hDPts[i].PositiveBucket.Counts, len(val.posBuckets.counts), len(val.posBuckets.counts))
 		copy(hDPts[i].PositiveBucket.Counts, val.posBuckets.counts)
 
-		hDPts[i].NegativeBucket.Offset = int32(val.negBuckets.startBin)
+		hDPts[i].NegativeBucket.Offset = val.negBuckets.startBin
 		hDPts[i].NegativeBucket.Counts = reset(hDPts[i].NegativeBucket.Counts, len(val.negBuckets.counts), len(val.negBuckets.counts))
 		copy(hDPts[i].NegativeBucket.Counts, val.negBuckets.counts)
 

vendor/go.opentelemetry.io/otel/sdk/metric/internal/aggregate/filtered_reservoir.go

@@ -0,0 +1,50 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package aggregate // import "go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
+
+import (
+	"context"
+	"time"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/sdk/metric/exemplar"
+)
+
+// FilteredExemplarReservoir wraps a [exemplar.Reservoir] with a filter.
+type FilteredExemplarReservoir[N int64 | float64] interface {
+	// Offer accepts the parameters associated with a measurement. The
+	// parameters will be stored as an exemplar if the filter decides to
+	// sample the measurement.
+	//
+	// The passed ctx needs to contain any baggage or span that were active
+	// when the measurement was made. This information may be used by the
+	// Reservoir in making a sampling decision.
+	Offer(ctx context.Context, val N, attr []attribute.KeyValue)
+	// Collect returns all the held exemplars in the reservoir.
+	Collect(dest *[]exemplar.Exemplar)
+}
+
+// filteredExemplarReservoir handles the pre-sampled exemplar of measurements made.
+type filteredExemplarReservoir[N int64 | float64] struct {
+	filter    exemplar.Filter
+	reservoir exemplar.Reservoir
+}
+
+// NewFilteredExemplarReservoir creates a [FilteredExemplarReservoir] which only offers values
+// that are allowed by the filter.
+func NewFilteredExemplarReservoir[N int64 | float64](f exemplar.Filter, r exemplar.Reservoir) FilteredExemplarReservoir[N] {
+	return &filteredExemplarReservoir[N]{
+		filter:    f,
+		reservoir: r,
+	}
+}
+
+func (f *filteredExemplarReservoir[N]) Offer(ctx context.Context, val N, attr []attribute.KeyValue) {
+	if f.filter(ctx) {
+		// only record the current time if we are sampling this measurement.
+		f.reservoir.Offer(ctx, time.Now(), exemplar.NewValue(val), attr)
+	}
+}
+
+func (f *filteredExemplarReservoir[N]) Collect(dest *[]exemplar.Exemplar) { f.reservoir.Collect(dest) }

vendor/go.opentelemetry.io/otel/sdk/metric/internal/aggregate/histogram.go

@@ -11,13 +11,12 @@ import (
 	"time"
 
 	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
 	"go.opentelemetry.io/otel/sdk/metric/metricdata"
 )
 
 type buckets[N int64 | float64] struct {
 	attrs attribute.Set
-	res   exemplar.FilteredReservoir[N]
+	res   FilteredExemplarReservoir[N]
 
 	counts   []uint64
 	count    uint64
@@ -48,13 +47,13 @@ type histValues[N int64 | float64] struct {
 	noSum  bool
 	bounds []float64
 
-	newRes   func() exemplar.FilteredReservoir[N]
+	newRes   func(attribute.Set) FilteredExemplarReservoir[N]
 	limit    limiter[*buckets[N]]
 	values   map[attribute.Distinct]*buckets[N]
 	valuesMu sync.Mutex
 }
 
-func newHistValues[N int64 | float64](bounds []float64, noSum bool, limit int, r func() exemplar.FilteredReservoir[N]) *histValues[N] {
+func newHistValues[N int64 | float64](bounds []float64, noSum bool, limit int, r func(attribute.Set) FilteredExemplarReservoir[N]) *histValues[N] {
 	// The responsibility of keeping all buckets correctly associated with the
 	// passed boundaries is ultimately this type's responsibility. Make a copy
 	// here so we can always guarantee this. Or, in the case of failure, have
@@ -94,7 +93,7 @@ func (s *histValues[N]) measure(ctx context.Context, value N, fltrAttr attribute
 		//
 		//   buckets = (-∞, 0], (0, 5.0], (5.0, 10.0], (10.0, +∞)
 		b = newBuckets[N](attr, len(s.bounds)+1)
-		b.res = s.newRes()
+		b.res = s.newRes(attr)
 
 		// Ensure min and max are recorded values (not zero), for new buckets.
 		b.min, b.max = value, value
@@ -109,7 +108,7 @@ func (s *histValues[N]) measure(ctx context.Context, value N, fltrAttr attribute
 
 // newHistogram returns an Aggregator that summarizes a set of measurements as
 // an histogram.
-func newHistogram[N int64 | float64](boundaries []float64, noMinMax, noSum bool, limit int, r func() exemplar.FilteredReservoir[N]) *histogram[N] {
+func newHistogram[N int64 | float64](boundaries []float64, noMinMax, noSum bool, limit int, r func(attribute.Set) FilteredExemplarReservoir[N]) *histogram[N] {
 	return &histogram[N]{
 		histValues: newHistValues[N](boundaries, noSum, limit, r),
 		noMinMax:   noMinMax,

vendor/go.opentelemetry.io/otel/sdk/metric/internal/aggregate/lastvalue.go

@@ -9,7 +9,6 @@ import (
 	"time"
 
 	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
 	"go.opentelemetry.io/otel/sdk/metric/metricdata"
 )
 
@@ -17,10 +16,10 @@ import (
 type datapoint[N int64 | float64] struct {
 	attrs attribute.Set
 	value N
-	res   exemplar.FilteredReservoir[N]
+	res   FilteredExemplarReservoir[N]
 }
 
-func newLastValue[N int64 | float64](limit int, r func() exemplar.FilteredReservoir[N]) *lastValue[N] {
+func newLastValue[N int64 | float64](limit int, r func(attribute.Set) FilteredExemplarReservoir[N]) *lastValue[N] {
 	return &lastValue[N]{
 		newRes: r,
 		limit:  newLimiter[datapoint[N]](limit),
@@ -33,7 +32,7 @@ func newLastValue[N int64 | float64](limit int, r func() exemplar.FilteredReserv
 type lastValue[N int64 | float64] struct {
 	sync.Mutex
 
-	newRes func() exemplar.FilteredReservoir[N]
+	newRes func(attribute.Set) FilteredExemplarReservoir[N]
 	limit  limiter[datapoint[N]]
 	values map[attribute.Distinct]datapoint[N]
 	start  time.Time
@@ -46,7 +45,7 @@ func (s *lastValue[N]) measure(ctx context.Context, value N, fltrAttr attribute.
 	attr := s.limit.Attributes(fltrAttr, s.values)
 	d, ok := s.values[attr.Equivalent()]
 	if !ok {
-		d.res = s.newRes()
+		d.res = s.newRes(attr)
 	}
 
 	d.attrs = attr
@@ -115,7 +114,7 @@ func (s *lastValue[N]) copyDpts(dest *[]metricdata.DataPoint[N], t time.Time) in
 
 // newPrecomputedLastValue returns an aggregator that summarizes a set of
 // observations as the last one made.
-func newPrecomputedLastValue[N int64 | float64](limit int, r func() exemplar.FilteredReservoir[N]) *precomputedLastValue[N] {
+func newPrecomputedLastValue[N int64 | float64](limit int, r func(attribute.Set) FilteredExemplarReservoir[N]) *precomputedLastValue[N] {
 	return &precomputedLastValue[N]{lastValue: newLastValue[N](limit, r)}
 }
 

vendor/go.opentelemetry.io/otel/sdk/metric/internal/aggregate/sum.go

@@ -9,25 +9,24 @@ import (
 	"time"
 
 	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
 	"go.opentelemetry.io/otel/sdk/metric/metricdata"
 )
 
 type sumValue[N int64 | float64] struct {
 	n     N
-	res   exemplar.FilteredReservoir[N]
+	res   FilteredExemplarReservoir[N]
 	attrs attribute.Set
 }
 
 // valueMap is the storage for sums.
 type valueMap[N int64 | float64] struct {
 	sync.Mutex
-	newRes func() exemplar.FilteredReservoir[N]
+	newRes func(attribute.Set) FilteredExemplarReservoir[N]
 	limit  limiter[sumValue[N]]
 	values map[attribute.Distinct]sumValue[N]
 }
 
-func newValueMap[N int64 | float64](limit int, r func() exemplar.FilteredReservoir[N]) *valueMap[N] {
+func newValueMap[N int64 | float64](limit int, r func(attribute.Set) FilteredExemplarReservoir[N]) *valueMap[N] {
 	return &valueMap[N]{
 		newRes: r,
 		limit:  newLimiter[sumValue[N]](limit),
@@ -42,7 +41,7 @@ func (s *valueMap[N]) measure(ctx context.Context, value N, fltrAttr attribute.S
 	attr := s.limit.Attributes(fltrAttr, s.values)
 	v, ok := s.values[attr.Equivalent()]
 	if !ok {
-		v.res = s.newRes()
+		v.res = s.newRes(attr)
 	}
 
 	v.attrs = attr
@@ -55,7 +54,7 @@ func (s *valueMap[N]) measure(ctx context.Context, value N, fltrAttr attribute.S
 // newSum returns an aggregator that summarizes a set of measurements as their
 // arithmetic sum. Each sum is scoped by attributes and the aggregation cycle
 // the measurements were made in.
-func newSum[N int64 | float64](monotonic bool, limit int, r func() exemplar.FilteredReservoir[N]) *sum[N] {
+func newSum[N int64 | float64](monotonic bool, limit int, r func(attribute.Set) FilteredExemplarReservoir[N]) *sum[N] {
 	return &sum[N]{
 		valueMap:  newValueMap[N](limit, r),
 		monotonic: monotonic,
@@ -142,9 +141,9 @@ func (s *sum[N]) cumulative(dest *metricdata.Aggregation) int {
 }
 
 // newPrecomputedSum returns an aggregator that summarizes a set of
-// observatrions as their arithmetic sum. Each sum is scoped by attributes and
+// observations as their arithmetic sum. Each sum is scoped by attributes and
 // the aggregation cycle the measurements were made in.
-func newPrecomputedSum[N int64 | float64](monotonic bool, limit int, r func() exemplar.FilteredReservoir[N]) *precomputedSum[N] {
+func newPrecomputedSum[N int64 | float64](monotonic bool, limit int, r func(attribute.Set) FilteredExemplarReservoir[N]) *precomputedSum[N] {
 	return &precomputedSum[N]{
 		valueMap:  newValueMap[N](limit, r),
 		monotonic: monotonic,
@@ -152,7 +151,7 @@ func newPrecomputedSum[N int64 | float64](monotonic bool, limit int, r func() ex
 	}
 }
 
-// precomputedSum summarizes a set of observatrions as their arithmetic sum.
+// precomputedSum summarizes a set of observations as their arithmetic sum.
 type precomputedSum[N int64 | float64] struct {
 	*valueMap[N]
 

vendor/go.opentelemetry.io/otel/sdk/metric/internal/exemplar/drop.go

@@ -1,23 +0,0 @@
-// Copyright The OpenTelemetry Authors
-// SPDX-License-Identifier: Apache-2.0
-
-package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
-
-import (
-	"context"
-
-	"go.opentelemetry.io/otel/attribute"
-)
-
-// Drop returns a [FilteredReservoir] that drops all measurements it is offered.
-func Drop[N int64 | float64]() FilteredReservoir[N] { return &dropRes[N]{} }
-
-type dropRes[N int64 | float64] struct{}
-
-// Offer does nothing, all measurements offered will be dropped.
-func (r *dropRes[N]) Offer(context.Context, N, []attribute.KeyValue) {}
-
-// Collect resets dest. No exemplars will ever be returned.
-func (r *dropRes[N]) Collect(dest *[]Exemplar) {
-	*dest = (*dest)[:0]
-}

vendor/go.opentelemetry.io/otel/sdk/metric/internal/exemplar/filtered_reservoir.go

@@ -1,49 +0,0 @@
-// Copyright The OpenTelemetry Authors
-// SPDX-License-Identifier: Apache-2.0
-
-package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
-
-import (
-	"context"
-	"time"
-
-	"go.opentelemetry.io/otel/attribute"
-)
-
-// FilteredReservoir wraps a [Reservoir] with a filter.
-type FilteredReservoir[N int64 | float64] interface {
-	// Offer accepts the parameters associated with a measurement. The
-	// parameters will be stored as an exemplar if the filter decides to
-	// sample the measurement.
-	//
-	// The passed ctx needs to contain any baggage or span that were active
-	// when the measurement was made. This information may be used by the
-	// Reservoir in making a sampling decision.
-	Offer(ctx context.Context, val N, attr []attribute.KeyValue)
-	// Collect returns all the held exemplars in the reservoir.
-	Collect(dest *[]Exemplar)
-}
-
-// filteredReservoir handles the pre-sampled exemplar of measurements made.
-type filteredReservoir[N int64 | float64] struct {
-	filter    Filter
-	reservoir Reservoir
-}
-
-// NewFilteredReservoir creates a [FilteredReservoir] which only offers values
-// that are allowed by the filter.
-func NewFilteredReservoir[N int64 | float64](f Filter, r Reservoir) FilteredReservoir[N] {
-	return &filteredReservoir[N]{
-		filter:    f,
-		reservoir: r,
-	}
-}
-
-func (f *filteredReservoir[N]) Offer(ctx context.Context, val N, attr []attribute.KeyValue) {
-	if f.filter(ctx) {
-		// only record the current time if we are sampling this measurment.
-		f.reservoir.Offer(ctx, time.Now(), NewValue(val), attr)
-	}
-}
-
-func (f *filteredReservoir[N]) Collect(dest *[]Exemplar) { f.reservoir.Collect(dest) }

vendor/go.opentelemetry.io/otel/sdk/metric/internal/exemplar/hist.go

@@ -1,46 +0,0 @@
-// Copyright The OpenTelemetry Authors
-// SPDX-License-Identifier: Apache-2.0
-
-package exemplar // import "go.opentelemetry.io/otel/sdk/metric/internal/exemplar"
-
-import (
-	"context"
-	"slices"
-	"sort"
-	"time"
-
-	"go.opentelemetry.io/otel/attribute"
-)
-
-// Histogram returns a [Reservoir] that samples the last measurement that falls
-// within a histogram bucket. The histogram bucket upper-boundaries are define
-// by bounds.
-//
-// The passed bounds will be sorted by this function.
-func Histogram(bounds []float64) Reservoir {
-	slices.Sort(bounds)
-	return &histRes{
-		bounds:  bounds,
-		storage: newStorage(len(bounds) + 1),
-	}
-}
-
-type histRes struct {
-	*storage
-
-	// bounds are bucket bounds in ascending order.
-	bounds []float64
-}
-
-func (r *histRes) Offer(ctx context.Context, t time.Time, v Value, a []attribute.KeyValue) {
-	var x float64
-	switch v.Type() {
-	case Int64ValueType:
-		x = float64(v.Int64())
-	case Float64ValueType:
-		x = v.Float64()
-	default:
-		panic("unknown value type")
-	}
-	r.store[sort.SearchFloat64s(r.bounds, x)] = newMeasurement(ctx, t, v, a)
-}

vendor/go.opentelemetry.io/otel/sdk/metric/internal/x/x.go

@@ -10,39 +10,23 @@ package x // import "go.opentelemetry.io/otel/sdk/metric/internal/x"
 import (
 	"os"
 	"strconv"
-	"strings"
 )
 
-var (
-	// Exemplars is an experimental feature flag that defines if exemplars
-	// should be recorded for metric data-points.
-	//
-	// To enable this feature set the OTEL_GO_X_EXEMPLAR environment variable
-	// to the case-insensitive string value of "true" (i.e. "True" and "TRUE"
-	// will also enable this).
-	Exemplars = newFeature("EXEMPLAR", func(v string) (string, bool) {
-		if strings.ToLower(v) == "true" {
-			return v, true
-		}
-		return "", false
-	})
-
-	// CardinalityLimit is an experimental feature flag that defines if
-	// cardinality limits should be applied to the recorded metric data-points.
-	//
-	// To enable this feature set the OTEL_GO_X_CARDINALITY_LIMIT environment
-	// variable to the integer limit value you want to use.
-	//
-	// Setting OTEL_GO_X_CARDINALITY_LIMIT to a value less than or equal to 0
-	// will disable the cardinality limits.
-	CardinalityLimit = newFeature("CARDINALITY_LIMIT", func(v string) (int, bool) {
-		n, err := strconv.Atoi(v)
-		if err != nil {
-			return 0, false
-		}
-		return n, true
-	})
-)
+// CardinalityLimit is an experimental feature flag that defines if
+// cardinality limits should be applied to the recorded metric data-points.
+//
+// To enable this feature set the OTEL_GO_X_CARDINALITY_LIMIT environment
+// variable to the integer limit value you want to use.
+//
+// Setting OTEL_GO_X_CARDINALITY_LIMIT to a value less than or equal to 0
+// will disable the cardinality limits.
+var CardinalityLimit = newFeature("CARDINALITY_LIMIT", func(v string) (int, bool) {
+	n, err := strconv.Atoi(v)
+	if err != nil {
+		return 0, false
+	}
+	return n, true
+})
 
 // Feature is an experimental feature control flag. It provides a uniform way
 // to interact with these feature flags and parse their values.

vendor/go.opentelemetry.io/otel/sdk/metric/manual_reader.go

@@ -113,18 +113,17 @@ func (mr *ManualReader) Collect(ctx context.Context, rm *metricdata.ResourceMetr
 	if err != nil {
 		return err
 	}
-	var errs []error
 	for _, producer := range mr.externalProducers.Load().([]Producer) {
-		externalMetrics, err := producer.Produce(ctx)
-		if err != nil {
-			errs = append(errs, err)
+		externalMetrics, e := producer.Produce(ctx)
+		if e != nil {
+			err = errors.Join(err, e)
 		}
 		rm.ScopeMetrics = append(rm.ScopeMetrics, externalMetrics...)
 	}
 
 	global.Debug("ManualReader collection", "Data", rm)
 
-	return unifyErrors(errs)
+	return err
 }
 
 // MarshalLog returns logging data about the ManualReader.

vendor/go.opentelemetry.io/otel/sdk/metric/meter.go

@@ -150,6 +150,11 @@ func (m *meter) int64ObservableInstrument(id Instrument, callbacks []metric.Int6
 				continue
 			}
 			inst.appendMeasures(in)
+
+			// Add the measures to the pipeline. It is required to maintain
+			// measures per pipeline to avoid calling the measure that
+			// is not part of the pipeline.
+			insert.pipeline.addInt64Measure(inst.observableID, in)
 			for _, cback := range callbacks {
 				inst := int64Observer{measures: in}
 				fn := cback
@@ -185,6 +190,11 @@ func (m *meter) Int64ObservableCounter(name string, options ...metric.Int64Obser
 // configured with options. The instrument is used to asynchronously record
 // int64 measurements once per a measurement collection cycle. Only the
 // measurements recorded during the collection cycle are exported.
+//
+// If Int64ObservableUpDownCounter is invoked repeatedly with the same Name,
+// Description, and Unit, only the first set of callbacks provided are used.
+// Use meter.RegisterCallback and Registration.Unregister to manage callbacks
+// if instrumentation can be created multiple times with different callbacks.
 func (m *meter) Int64ObservableUpDownCounter(name string, options ...metric.Int64ObservableUpDownCounterOption) (metric.Int64ObservableUpDownCounter, error) {
 	cfg := metric.NewInt64ObservableUpDownCounterConfig(options...)
 	id := Instrument{
@@ -201,6 +211,11 @@ func (m *meter) Int64ObservableUpDownCounter(name string, options ...metric.Int6
 // configured with options. The instrument is used to asynchronously record
 // instantaneous int64 measurements once per a measurement collection cycle.
 // Only the measurements recorded during the collection cycle are exported.
+//
+// If Int64ObservableGauge is invoked repeatedly with the same Name,
+// Description, and Unit, only the first set of callbacks provided are used.
+// Use meter.RegisterCallback and Registration.Unregister to manage callbacks
+// if instrumentation can be created multiple times with different callbacks.
 func (m *meter) Int64ObservableGauge(name string, options ...metric.Int64ObservableGaugeOption) (metric.Int64ObservableGauge, error) {
 	cfg := metric.NewInt64ObservableGaugeConfig(options...)
 	id := Instrument{
@@ -299,6 +314,11 @@ func (m *meter) float64ObservableInstrument(id Instrument, callbacks []metric.Fl
 				continue
 			}
 			inst.appendMeasures(in)
+
+			// Add the measures to the pipeline. It is required to maintain
+			// measures per pipeline to avoid calling the measure that
+			// is not part of the pipeline.
+			insert.pipeline.addFloat64Measure(inst.observableID, in)
 			for _, cback := range callbacks {
 				inst := float64Observer{measures: in}
 				fn := cback
@@ -334,6 +354,11 @@ func (m *meter) Float64ObservableCounter(name string, options ...metric.Float64O
 // and configured with options. The instrument is used to asynchronously record
 // float64 measurements once per a measurement collection cycle. Only the
 // measurements recorded during the collection cycle are exported.
+//
+// If Float64ObservableUpDownCounter is invoked repeatedly with the same Name,
+// Description, and Unit, only the first set of callbacks provided are used.
+// Use meter.RegisterCallback and Registration.Unregister to manage callbacks
+// if instrumentation can be created multiple times with different callbacks.
 func (m *meter) Float64ObservableUpDownCounter(name string, options ...metric.Float64ObservableUpDownCounterOption) (metric.Float64ObservableUpDownCounter, error) {
 	cfg := metric.NewFloat64ObservableUpDownCounterConfig(options...)
 	id := Instrument{
@@ -350,6 +375,11 @@ func (m *meter) Float64ObservableUpDownCounter(name string, options ...metric.Fl
 // configured with options. The instrument is used to asynchronously record
 // instantaneous float64 measurements once per a measurement collection cycle.
 // Only the measurements recorded during the collection cycle are exported.
+//
+// If Float64ObservableGauge is invoked repeatedly with the same Name,
+// Description, and Unit, only the first set of callbacks provided are used.
+// Use meter.RegisterCallback and Registration.Unregister to manage callbacks
+// if instrumentation can be created multiple times with different callbacks.
 func (m *meter) Float64ObservableGauge(name string, options ...metric.Float64ObservableGaugeOption) (metric.Float64ObservableGauge, error) {
 	cfg := metric.NewFloat64ObservableGaugeConfig(options...)
 	id := Instrument{
@@ -421,73 +451,80 @@ func (m *meter) RegisterCallback(f metric.Callback, insts ...metric.Observable)
 		return noopRegister{}, nil
 	}
 
-	reg := newObserver()
-	var errs multierror
+	var err error
+	validInstruments := make([]metric.Observable, 0, len(insts))
 	for _, inst := range insts {
-		// Unwrap any global.
-		if u, ok := inst.(interface {
-			Unwrap() metric.Observable
-		}); ok {
-			inst = u.Unwrap()
-		}
-
 		switch o := inst.(type) {
 		case int64Observable:
-			if err := o.registerable(m); err != nil {
-				if !errors.Is(err, errEmptyAgg) {
-					errs.append(err)
+			if e := o.registerable(m); e != nil {
+				if !errors.Is(e, errEmptyAgg) {
+					err = errors.Join(err, e)
 				}
 				continue
 			}
-			reg.registerInt64(o.observablID)
+
+			validInstruments = append(validInstruments, inst)
 		case float64Observable:
-			if err := o.registerable(m); err != nil {
-				if !errors.Is(err, errEmptyAgg) {
-					errs.append(err)
+			if e := o.registerable(m); e != nil {
+				if !errors.Is(e, errEmptyAgg) {
+					err = errors.Join(err, e)
 				}
 				continue
 			}
-			reg.registerFloat64(o.observablID)
+
+			validInstruments = append(validInstruments, inst)
 		default:
 			// Instrument external to the SDK.
 			return nil, fmt.Errorf("invalid observable: from different implementation")
 		}
 	}
 
-	err := errs.errorOrNil()
-	if reg.len() == 0 {
+	if len(validInstruments) == 0 {
 		// All insts use drop aggregation or are invalid.
 		return noopRegister{}, err
 	}
 
-	// Some or all instruments were valid.
-	cback := func(ctx context.Context) error { return f(ctx, reg) }
-	return m.pipes.registerMultiCallback(cback), err
+	unregs := make([]func(), len(m.pipes))
+	for ix, pipe := range m.pipes {
+		reg := newObserver(pipe)
+		for _, inst := range validInstruments {
+			switch o := inst.(type) {
+			case int64Observable:
+				reg.registerInt64(o.observableID)
+			case float64Observable:
+				reg.registerFloat64(o.observableID)
+			}
+		}
+
+		// Some or all instruments were valid.
+		cBack := func(ctx context.Context) error { return f(ctx, reg) }
+		unregs[ix] = pipe.addMultiCallback(cBack)
+	}
+
+	return unregisterFuncs{f: unregs}, err
 }
 
 type observer struct {
 	embedded.Observer
 
-	float64 map[observablID[float64]]struct{}
-	int64   map[observablID[int64]]struct{}
+	pipe    *pipeline
+	float64 map[observableID[float64]]struct{}
+	int64   map[observableID[int64]]struct{}
 }
 
-func newObserver() observer {
+func newObserver(p *pipeline) observer {
 	return observer{
-		float64: make(map[observablID[float64]]struct{}),
-		int64:   make(map[observablID[int64]]struct{}),
+		pipe:    p,
+		float64: make(map[observableID[float64]]struct{}),
+		int64:   make(map[observableID[int64]]struct{}),
 	}
 }
 
-func (r observer) len() int {
-	return len(r.float64) + len(r.int64)
-}
-
-func (r observer) registerFloat64(id observablID[float64]) {
+func (r observer) registerFloat64(id observableID[float64]) {
 	r.float64[id] = struct{}{}
 }
 
-func (r observer) registerInt64(id observablID[int64]) {
+func (r observer) registerInt64(id observableID[int64]) {
 	r.int64[id] = struct{}{}
 }
 
@@ -501,22 +538,12 @@ func (r observer) ObserveFloat64(o metric.Float64Observable, v float64, opts ...
 	switch conv := o.(type) {
 	case float64Observable:
 		oImpl = conv
-	case interface {
-		Unwrap() metric.Observable
-	}:
-		// Unwrap any global.
-		async := conv.Unwrap()
-		var ok bool
-		if oImpl, ok = async.(float64Observable); !ok {
-			global.Error(errUnknownObserver, "failed to record asynchronous")
-			return
-		}
 	default:
 		global.Error(errUnknownObserver, "failed to record")
 		return
 	}
 
-	if _, registered := r.float64[oImpl.observablID]; !registered {
+	if _, registered := r.float64[oImpl.observableID]; !registered {
 		if !oImpl.dropAggregation {
 			global.Error(errUnregObserver, "failed to record",
 				"name", oImpl.name,
@@ -528,7 +555,12 @@ func (r observer) ObserveFloat64(o metric.Float64Observable, v float64, opts ...
 		return
 	}
 	c := metric.NewObserveConfig(opts)
-	oImpl.observe(v, c.Attributes())
+	// Access to r.pipe.float64Measure is already guarded by a lock in pipeline.produce.
+	// TODO (#5946): Refactor pipeline and observable measures.
+	measures := r.pipe.float64Measures[oImpl.observableID]
+	for _, m := range measures {
+		m(context.Background(), v, c.Attributes())
+	}
 }
 
 func (r observer) ObserveInt64(o metric.Int64Observable, v int64, opts ...metric.ObserveOption) {
@@ -536,22 +568,12 @@ func (r observer) ObserveInt64(o metric.Int64Observable, v int64, opts ...metric
 	switch conv := o.(type) {
 	case int64Observable:
 		oImpl = conv
-	case interface {
-		Unwrap() metric.Observable
-	}:
-		// Unwrap any global.
-		async := conv.Unwrap()
-		var ok bool
-		if oImpl, ok = async.(int64Observable); !ok {
-			global.Error(errUnknownObserver, "failed to record asynchronous")
-			return
-		}
 	default:
 		global.Error(errUnknownObserver, "failed to record")
 		return
 	}
 
-	if _, registered := r.int64[oImpl.observablID]; !registered {
+	if _, registered := r.int64[oImpl.observableID]; !registered {
 		if !oImpl.dropAggregation {
 			global.Error(errUnregObserver, "failed to record",
 				"name", oImpl.name,
@@ -563,7 +585,12 @@ func (r observer) ObserveInt64(o metric.Int64Observable, v int64, opts ...metric
 		return
 	}
 	c := metric.NewObserveConfig(opts)
-	oImpl.observe(v, c.Attributes())
+	// Access to r.pipe.int64Measures is already guarded b a lock in pipeline.produce.
+	// TODO (#5946): Refactor pipeline and observable measures.
+	measures := r.pipe.int64Measures[oImpl.observableID]
+	for _, m := range measures {
+		m(context.Background(), v, c.Attributes())
+	}
 }
 
 type noopRegister struct{ embedded.Registration }

vendor/go.opentelemetry.io/otel/sdk/metric/periodic_reader.go

@@ -251,18 +251,17 @@ func (r *PeriodicReader) collect(ctx context.Context, p interface{}, rm *metricd
 	if err != nil {
 		return err
 	}
-	var errs []error
 	for _, producer := range r.externalProducers.Load().([]Producer) {
-		externalMetrics, err := producer.Produce(ctx)
-		if err != nil {
-			errs = append(errs, err)
+		externalMetrics, e := producer.Produce(ctx)
+		if e != nil {
+			err = errors.Join(err, e)
 		}
 		rm.ScopeMetrics = append(rm.ScopeMetrics, externalMetrics...)
 	}
 
 	global.Debug("PeriodicReader collection", "Data", rm)
 
-	return unifyErrors(errs)
+	return err
 }
 
 // export exports metric data m using r's exporter.

vendor/go.opentelemetry.io/otel/sdk/metric/pipeline.go

@@ -8,14 +8,13 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"strings"
 	"sync"
 	"sync/atomic"
 
 	"go.opentelemetry.io/otel/internal/global"
-	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/metric/embedded"
 	"go.opentelemetry.io/otel/sdk/instrumentation"
+	"go.opentelemetry.io/otel/sdk/metric/exemplar"
 	"go.opentelemetry.io/otel/sdk/metric/internal"
 	"go.opentelemetry.io/otel/sdk/metric/internal/aggregate"
 	"go.opentelemetry.io/otel/sdk/metric/internal/x"
@@ -38,14 +37,17 @@ type instrumentSync struct {
 	compAgg     aggregate.ComputeAggregation
 }
 
-func newPipeline(res *resource.Resource, reader Reader, views []View) *pipeline {
+func newPipeline(res *resource.Resource, reader Reader, views []View, exemplarFilter exemplar.Filter) *pipeline {
 	if res == nil {
 		res = resource.Empty()
 	}
 	return &pipeline{
-		resource: res,
-		reader:   reader,
-		views:    views,
+		resource:        res,
+		reader:          reader,
+		views:           views,
+		int64Measures:   map[observableID[int64]][]aggregate.Measure[int64]{},
+		float64Measures: map[observableID[float64]][]aggregate.Measure[float64]{},
+		exemplarFilter:  exemplarFilter,
 		// aggregations is lazy allocated when needed.
 	}
 }
@@ -63,9 +65,26 @@ type pipeline struct {
 	views  []View
 
 	sync.Mutex
-	aggregations   map[instrumentation.Scope][]instrumentSync
-	callbacks      []func(context.Context) error
-	multiCallbacks list.List
+	int64Measures   map[observableID[int64]][]aggregate.Measure[int64]
+	float64Measures map[observableID[float64]][]aggregate.Measure[float64]
+	aggregations    map[instrumentation.Scope][]instrumentSync
+	callbacks       []func(context.Context) error
+	multiCallbacks  list.List
+	exemplarFilter  exemplar.Filter
+}
+
+// addInt64Measure adds a new int64 measure to the pipeline for each observer.
+func (p *pipeline) addInt64Measure(id observableID[int64], m []aggregate.Measure[int64]) {
+	p.Lock()
+	defer p.Unlock()
+	p.int64Measures[id] = m
+}
+
+// addFloat64Measure adds a new float64 measure to the pipeline for each observer.
+func (p *pipeline) addFloat64Measure(id observableID[float64], m []aggregate.Measure[float64]) {
+	p.Lock()
+	defer p.Unlock()
+	p.float64Measures[id] = m
 }
 
 // addSync adds the instrumentSync to pipeline p with scope. This method is not
@@ -105,14 +124,15 @@ func (p *pipeline) produce(ctx context.Context, rm *metricdata.ResourceMetrics)
 	p.Lock()
 	defer p.Unlock()
 
-	var errs multierror
+	var err error
 	for _, c := range p.callbacks {
 		// TODO make the callbacks parallel. ( #3034 )
-		if err := c(ctx); err != nil {
-			errs.append(err)
+		if e := c(ctx); e != nil {
+			err = errors.Join(err, e)
 		}
 		if err := ctx.Err(); err != nil {
 			rm.Resource = nil
+			clear(rm.ScopeMetrics) // Erase elements to let GC collect objects.
 			rm.ScopeMetrics = rm.ScopeMetrics[:0]
 			return err
 		}
@@ -120,12 +140,13 @@ func (p *pipeline) produce(ctx context.Context, rm *metricdata.ResourceMetrics)
 	for e := p.multiCallbacks.Front(); e != nil; e = e.Next() {
 		// TODO make the callbacks parallel. ( #3034 )
 		f := e.Value.(multiCallback)
-		if err := f(ctx); err != nil {
-			errs.append(err)
+		if e := f(ctx); e != nil {
+			err = errors.Join(err, e)
 		}
 		if err := ctx.Err(); err != nil {
 			// This means the context expired before we finished running callbacks.
 			rm.Resource = nil
+			clear(rm.ScopeMetrics) // Erase elements to let GC collect objects.
 			rm.ScopeMetrics = rm.ScopeMetrics[:0]
 			return err
 		}
@@ -157,7 +178,7 @@ func (p *pipeline) produce(ctx context.Context, rm *metricdata.ResourceMetrics)
 
 	rm.ScopeMetrics = rm.ScopeMetrics[:i]
 
-	return errs.errorOrNil()
+	return err
 }
 
 // inserter facilitates inserting of new instruments from a single scope into a
@@ -219,7 +240,7 @@ func (i *inserter[N]) Instrument(inst Instrument, readerAggregation Aggregation)
 		measures []aggregate.Measure[N]
 	)
 
-	errs := &multierror{wrapped: errCreatingAggregators}
+	var err error
 	seen := make(map[uint64]struct{})
 	for _, v := range i.pipeline.views {
 		stream, match := v(inst)
@@ -227,9 +248,9 @@ func (i *inserter[N]) Instrument(inst Instrument, readerAggregation Aggregation)
 			continue
 		}
 		matched = true
-		in, id, err := i.cachedAggregator(inst.Scope, inst.Kind, stream, readerAggregation)
-		if err != nil {
-			errs.append(err)
+		in, id, e := i.cachedAggregator(inst.Scope, inst.Kind, stream, readerAggregation)
+		if e != nil {
+			err = errors.Join(err, e)
 		}
 		if in == nil { // Drop aggregation.
 			continue
@@ -242,8 +263,12 @@ func (i *inserter[N]) Instrument(inst Instrument, readerAggregation Aggregation)
 		measures = append(measures, in)
 	}
 
+	if err != nil {
+		err = errors.Join(errCreatingAggregators, err)
+	}
+
 	if matched {
-		return measures, errs.errorOrNil()
+		return measures, err
 	}
 
 	// Apply implicit default view if no explicit matched.
@@ -252,15 +277,18 @@ func (i *inserter[N]) Instrument(inst Instrument, readerAggregation Aggregation)
 		Description: inst.Description,
 		Unit:        inst.Unit,
 	}
-	in, _, err := i.cachedAggregator(inst.Scope, inst.Kind, stream, readerAggregation)
-	if err != nil {
-		errs.append(err)
+	in, _, e := i.cachedAggregator(inst.Scope, inst.Kind, stream, readerAggregation)
+	if e != nil {
+		if err == nil {
+			err = errCreatingAggregators
+		}
+		err = errors.Join(err, e)
 	}
 	if in != nil {
 		// Ensured to have not seen given matched was false.
 		measures = append(measures, in)
 	}
-	return measures, errs.errorOrNil()
+	return measures, err
 }
 
 // addCallback registers a single instrument callback to be run when
@@ -329,6 +357,9 @@ func (i *inserter[N]) cachedAggregator(scope instrumentation.Scope, kind Instrum
 		// The view explicitly requested the default aggregation.
 		stream.Aggregation = DefaultAggregationSelector(kind)
 	}
+	if stream.ExemplarReservoirProviderSelector == nil {
+		stream.ExemplarReservoirProviderSelector = DefaultExemplarReservoirProviderSelector
+	}
 
 	if err := isAggregatorCompatible(kind, stream.Aggregation); err != nil {
 		return nil, 0, fmt.Errorf(
@@ -349,7 +380,7 @@ func (i *inserter[N]) cachedAggregator(scope instrumentation.Scope, kind Instrum
 	cv := i.aggregators.Lookup(normID, func() aggVal[N] {
 		b := aggregate.Builder[N]{
 			Temporality:   i.pipeline.reader.temporality(kind),
-			ReservoirFunc: reservoirFunc[N](stream.Aggregation),
+			ReservoirFunc: reservoirFunc[N](stream.ExemplarReservoirProviderSelector(stream.Aggregation), i.pipeline.exemplarFilter),
 		}
 		b.Filter = stream.AttributeFilter
 		// A value less than or equal to zero will disable the aggregation
@@ -552,24 +583,16 @@ func isAggregatorCompatible(kind InstrumentKind, agg Aggregation) error {
 // measurement.
 type pipelines []*pipeline
 
-func newPipelines(res *resource.Resource, readers []Reader, views []View) pipelines {
+func newPipelines(res *resource.Resource, readers []Reader, views []View, exemplarFilter exemplar.Filter) pipelines {
 	pipes := make([]*pipeline, 0, len(readers))
 	for _, r := range readers {
-		p := newPipeline(res, r, views)
+		p := newPipeline(res, r, views, exemplarFilter)
 		r.register(p)
 		pipes = append(pipes, p)
 	}
 	return pipes
 }
 
-func (p pipelines) registerMultiCallback(c multiCallback) metric.Registration {
-	unregs := make([]func(), len(p))
-	for i, pipe := range p {
-		unregs[i] = pipe.addMultiCallback(c)
-	}
-	return unregisterFuncs{f: unregs}
-}
-
 type unregisterFuncs struct {
 	embedded.Registration
 	f []func()
@@ -602,15 +625,15 @@ func newResolver[N int64 | float64](p pipelines, vc *cache[string, instID]) reso
 func (r resolver[N]) Aggregators(id Instrument) ([]aggregate.Measure[N], error) {
 	var measures []aggregate.Measure[N]
 
-	errs := &multierror{}
+	var err error
 	for _, i := range r.inserters {
-		in, err := i.Instrument(id, i.readerDefaultAggregation(id.Kind))
-		if err != nil {
-			errs.append(err)
+		in, e := i.Instrument(id, i.readerDefaultAggregation(id.Kind))
+		if e != nil {
+			err = errors.Join(err, e)
 		}
 		measures = append(measures, in...)
 	}
-	return measures, errs.errorOrNil()
+	return measures, err
 }
 
 // HistogramAggregators returns the histogram Aggregators that must be updated by the instrument
@@ -619,37 +642,18 @@ func (r resolver[N]) Aggregators(id Instrument) ([]aggregate.Measure[N], error)
 func (r resolver[N]) HistogramAggregators(id Instrument, boundaries []float64) ([]aggregate.Measure[N], error) {
 	var measures []aggregate.Measure[N]
 
-	errs := &multierror{}
+	var err error
 	for _, i := range r.inserters {
 		agg := i.readerDefaultAggregation(id.Kind)
 		if histAgg, ok := agg.(AggregationExplicitBucketHistogram); ok && len(boundaries) > 0 {
 			histAgg.Boundaries = boundaries
 			agg = histAgg
 		}
-		in, err := i.Instrument(id, agg)
-		if err != nil {
-			errs.append(err)
+		in, e := i.Instrument(id, agg)
+		if e != nil {
+			err = errors.Join(err, e)
 		}
 		measures = append(measures, in...)
 	}
-	return measures, errs.errorOrNil()
-}
-
-type multierror struct {
-	wrapped error
-	errors  []string
-}
-
-func (m *multierror) errorOrNil() error {
-	if len(m.errors) == 0 {
-		return nil
-	}
-	if m.wrapped == nil {
-		return errors.New(strings.Join(m.errors, "; "))
-	}
-	return fmt.Errorf("%w: %s", m.wrapped, strings.Join(m.errors, "; "))
-}
-
-func (m *multierror) append(err error) {
-	m.errors = append(m.errors, err.Error())
+	return measures, err
 }

vendor/go.opentelemetry.io/otel/sdk/metric/provider.go

@@ -42,7 +42,7 @@ func NewMeterProvider(options ...Option) *MeterProvider {
 	flush, sdown := conf.readerSignals()
 
 	mp := &MeterProvider{
-		pipes:      newPipelines(conf.res, conf.readers, conf.views),
+		pipes:      newPipelines(conf.res, conf.readers, conf.views, conf.exemplarFilter),
 		forceFlush: flush,
 		shutdown:   sdown,
 	}
@@ -76,15 +76,17 @@ func (mp *MeterProvider) Meter(name string, options ...metric.MeterOption) metri
 
 	c := metric.NewMeterConfig(options...)
 	s := instrumentation.Scope{
-		Name:      name,
-		Version:   c.InstrumentationVersion(),
-		SchemaURL: c.SchemaURL(),
+		Name:       name,
+		Version:    c.InstrumentationVersion(),
+		SchemaURL:  c.SchemaURL(),
+		Attributes: c.InstrumentationAttributes(),
 	}
 
 	global.Info("Meter created",
 		"Name", s.Name,
 		"Version", s.Version,
 		"SchemaURL", s.SchemaURL,
+		"Attributes", s.Attributes,
 	)
 
 	return mp.meters.Lookup(s, func() *meter {

vendor/go.opentelemetry.io/otel/sdk/metric/reader.go

@@ -34,7 +34,7 @@ var errNonPositiveDuration = fmt.Errorf("non-positive duration")
 // start of bi-directional control flow.
 //
 // Typically, push-based exporters that are periodic will
-// implement PeroidicExporter themselves and construct a
+// implement PeriodicExporter themselves and construct a
 // PeriodicReader to satisfy this interface.
 //
 // Pull-based exporters will typically implement Register

vendor/go.opentelemetry.io/otel/sdk/metric/version.go

@@ -5,5 +5,5 @@ package metric // import "go.opentelemetry.io/otel/sdk/metric"
 
 // version is the current release version of the metric SDK in use.
 func version() string {
-	return "1.28.0"
+	return "1.32.0"
 }

vendor/go.opentelemetry.io/otel/sdk/metric/view.go

@@ -96,11 +96,12 @@ func NewView(criteria Instrument, mask Stream) View {
 	return func(i Instrument) (Stream, bool) {
 		if matchFunc(i) {
 			return Stream{
-				Name:            nonZero(mask.Name, i.Name),
-				Description:     nonZero(mask.Description, i.Description),
-				Unit:            nonZero(mask.Unit, i.Unit),
-				Aggregation:     agg,
-				AttributeFilter: mask.AttributeFilter,
+				Name:                              nonZero(mask.Name, i.Name),
+				Description:                       nonZero(mask.Description, i.Description),
+				Unit:                              nonZero(mask.Unit, i.Unit),
+				Aggregation:                       agg,
+				AttributeFilter:                   mask.AttributeFilter,
+				ExemplarReservoirProviderSelector: mask.ExemplarReservoirProviderSelector,
 			}, true
 		}
 		return Stream{}, false

vendor/go.opentelemetry.io/otel/sdk/resource/auto.go

@@ -7,7 +7,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"strings"
 )
 
 // ErrPartialResource is returned by a detector when complete source
@@ -57,62 +56,37 @@ func Detect(ctx context.Context, detectors ...Detector) (*Resource, error) {
 // these errors will be returned. Otherwise, nil is returned.
 func detect(ctx context.Context, res *Resource, detectors []Detector) error {
 	var (
-		r    *Resource
-		errs detectErrs
-		err  error
+		r   *Resource
+		err error
+		e   error
 	)
 
 	for _, detector := range detectors {
 		if detector == nil {
 			continue
 		}
-		r, err = detector.Detect(ctx)
-		if err != nil {
-			errs = append(errs, err)
-			if !errors.Is(err, ErrPartialResource) {
+		r, e = detector.Detect(ctx)
+		if e != nil {
+			err = errors.Join(err, e)
+			if !errors.Is(e, ErrPartialResource) {
 				continue
 			}
 		}
-		r, err = Merge(res, r)
-		if err != nil {
-			errs = append(errs, err)
+		r, e = Merge(res, r)
+		if e != nil {
+			err = errors.Join(err, e)
 		}
 		*res = *r
 	}
 
-	if len(errs) == 0 {
-		return nil
+	if err != nil {
+		if errors.Is(err, ErrSchemaURLConflict) {
+			// If there has been a merge conflict, ensure the resource has no
+			// schema URL.
+			res.schemaURL = ""
+		}
+
+		err = fmt.Errorf("error detecting resource: %w", err)
 	}
-	if errors.Is(errs, ErrSchemaURLConflict) {
-		// If there has been a merge conflict, ensure the resource has no
-		// schema URL.
-		res.schemaURL = ""
-	}
-	return errs
-}
-
-type detectErrs []error
-
-func (e detectErrs) Error() string {
-	errStr := make([]string, len(e))
-	for i, err := range e {
-		errStr[i] = fmt.Sprintf("* %s", err)
-	}
-
-	format := "%d errors occurred detecting resource:\n\t%s"
-	return fmt.Sprintf(format, len(e), strings.Join(errStr, "\n\t"))
-}
-
-func (e detectErrs) Unwrap() error {
-	switch len(e) {
-	case 0:
-		return nil
-	case 1:
-		return e[0]
-	}
-	return e[1:]
-}
-
-func (e detectErrs) Is(target error) bool {
-	return len(e) != 0 && errors.Is(e[0], target)
+	return err
 }

vendor/go.opentelemetry.io/otel/sdk/resource/builtin.go

@@ -20,15 +20,13 @@ type (
 	// telemetrySDK is a Detector that provides information about
 	// the OpenTelemetry SDK used.  This Detector is included as a
 	// builtin. If these resource attributes are not wanted, use
-	// the WithTelemetrySDK(nil) or WithoutBuiltin() options to
-	// explicitly disable them.
+	// resource.New() to explicitly disable them.
 	telemetrySDK struct{}
 
 	// host is a Detector that provides information about the host
 	// being run on. This Detector is included as a builtin. If
 	// these resource attributes are not wanted, use the
-	// WithHost(nil) or WithoutBuiltin() options to explicitly
-	// disable them.
+	// resource.New() to explicitly disable them.
 	host struct{}
 
 	stringDetector struct {

vendor/go.opentelemetry.io/otel/sdk/resource/host_id_windows.go

@@ -10,17 +10,16 @@ import (
 	"golang.org/x/sys/windows/registry"
 )
 
-// implements hostIDReader
+// implements hostIDReader.
 type hostIDReaderWindows struct{}
 
-// read reads MachineGuid from the windows registry key:
-// SOFTWARE\Microsoft\Cryptography
+// read reads MachineGuid from the Windows registry key:
+// SOFTWARE\Microsoft\Cryptography.
 func (*hostIDReaderWindows) read() (string, error) {
 	k, err := registry.OpenKey(
 		registry.LOCAL_MACHINE, `SOFTWARE\Microsoft\Cryptography`,
 		registry.QUERY_VALUE|registry.WOW64_64KEY,
 	)
-
 	if err != nil {
 		return "", err
 	}

vendor/go.opentelemetry.io/otel/sdk/resource/os_windows.go

@@ -17,7 +17,6 @@ import (
 func platformOSDescription() (string, error) {
 	k, err := registry.OpenKey(
 		registry.LOCAL_MACHINE, `SOFTWARE\Microsoft\Windows NT\CurrentVersion`, registry.QUERY_VALUE)
-
 	if err != nil {
 		return "", err
 	}

vendor/go.opentelemetry.io/otel/sdk/trace/batch_span_processor.go

@@ -280,6 +280,7 @@ func (bsp *batchSpanProcessor) exportSpans(ctx context.Context) error {
 		//
 		// It is up to the exporter to implement any type of retry logic if a batch is failing
 		// to be exported, since it is specific to the protocol and backend being sent to.
+		clear(bsp.batch) // Erase elements to let GC collect objects
 		bsp.batch = bsp.batch[:0]
 
 		if err != nil {
@@ -316,7 +317,11 @@ func (bsp *batchSpanProcessor) processQueue() {
 			bsp.batchMutex.Unlock()
 			if shouldExport {
 				if !bsp.timer.Stop() {
-					<-bsp.timer.C
+					// Handle both GODEBUG=asynctimerchan=[0|1] properly.
+					select {
+					case <-bsp.timer.C:
+					default:
+					}
 				}
 				if err := bsp.exportSpans(ctx); err != nil {
 					otel.Handle(err)

vendor/go.opentelemetry.io/otel/sdk/trace/evictedqueue.go

@@ -12,25 +12,26 @@ import (
 
 // evictedQueue is a FIFO queue with a configurable capacity.
 type evictedQueue[T any] struct {
-	queue        []T
-	capacity     int
-	droppedCount int
-	logDropped   func()
+	queue          []T
+	capacity       int
+	droppedCount   int
+	logDroppedMsg  string
+	logDroppedOnce sync.Once
 }
 
 func newEvictedQueueEvent(capacity int) evictedQueue[Event] {
 	// Do not pre-allocate queue, do this lazily.
 	return evictedQueue[Event]{
-		capacity:   capacity,
-		logDropped: sync.OnceFunc(func() { global.Warn("limit reached: dropping trace trace.Event") }),
+		capacity:      capacity,
+		logDroppedMsg: "limit reached: dropping trace trace.Event",
 	}
 }
 
 func newEvictedQueueLink(capacity int) evictedQueue[Link] {
 	// Do not pre-allocate queue, do this lazily.
 	return evictedQueue[Link]{
-		capacity:   capacity,
-		logDropped: sync.OnceFunc(func() { global.Warn("limit reached: dropping trace trace.Link") }),
+		capacity:      capacity,
+		logDroppedMsg: "limit reached: dropping trace trace.Link",
 	}
 }
 
@@ -53,6 +54,10 @@ func (eq *evictedQueue[T]) add(value T) {
 	eq.queue = append(eq.queue, value)
 }
 
+func (eq *evictedQueue[T]) logDropped() {
+	eq.logDroppedOnce.Do(func() { global.Warn(eq.logDroppedMsg) })
+}
+
 // copy returns a copy of the evictedQueue.
 func (eq *evictedQueue[T]) copy() []T {
 	return slices.Clone(eq.queue)

vendor/go.opentelemetry.io/otel/sdk/trace/provider.go

@@ -139,9 +139,10 @@ func (p *TracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 		name = defaultTracerName
 	}
 	is := instrumentation.Scope{
-		Name:      name,
-		Version:   c.InstrumentationVersion(),
-		SchemaURL: c.SchemaURL(),
+		Name:       name,
+		Version:    c.InstrumentationVersion(),
+		SchemaURL:  c.SchemaURL(),
+		Attributes: c.InstrumentationAttributes(),
 	}
 
 	t, ok := func() (trace.Tracer, bool) {
@@ -168,7 +169,7 @@ func (p *TracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 		//   slowing down all tracing consumers.
 		// - Logging code may be instrumented with tracing and deadlock because it could try
 		//   acquiring the same non-reentrant mutex.
-		global.Info("Tracer created", "name", name, "version", is.Version, "schemaURL", is.SchemaURL)
+		global.Info("Tracer created", "name", name, "version", is.Version, "schemaURL", is.SchemaURL, "attributes", is.Attributes)
 	}
 	return t
 }

vendor/go.opentelemetry.io/otel/sdk/trace/snapshot.go

@@ -99,7 +99,7 @@ func (s snapshot) InstrumentationScope() instrumentation.Scope {
 
 // InstrumentationLibrary returns information about the instrumentation
 // library that created the span.
-func (s snapshot) InstrumentationLibrary() instrumentation.Library {
+func (s snapshot) InstrumentationLibrary() instrumentation.Library { //nolint:staticcheck // This method needs to be define for backwards compatibility
 	return s.instrumentationScope
 }
 

vendor/go.opentelemetry.io/otel/sdk/trace/span.go

@@ -62,7 +62,7 @@ type ReadOnlySpan interface {
 	// InstrumentationLibrary returns information about the instrumentation
 	// library that created the span.
 	// Deprecated: please use InstrumentationScope instead.
-	InstrumentationLibrary() instrumentation.Library
+	InstrumentationLibrary() instrumentation.Library //nolint:staticcheck // This method needs to be define for backwards compatibility
 	// Resource returns information about the entity that produced the span.
 	Resource() *resource.Resource
 	// DroppedAttributes returns the number of attributes dropped by the span
@@ -174,6 +174,17 @@ func (s *recordingSpan) IsRecording() bool {
 	s.mu.Lock()
 	defer s.mu.Unlock()
 
+	return s.isRecording()
+}
+
+// isRecording returns if this span is being recorded. If this span has ended
+// this will return false.
+//
+// This method assumes s.mu.Lock is held by the caller.
+func (s *recordingSpan) isRecording() bool {
+	if s == nil {
+		return false
+	}
 	return s.endTime.IsZero()
 }
 
@@ -182,11 +193,15 @@ func (s *recordingSpan) IsRecording() bool {
 // included in the set status when the code is for an error. If this span is
 // not being recorded than this method does nothing.
 func (s *recordingSpan) SetStatus(code codes.Code, description string) {
-	if !s.IsRecording() {
+	if s == nil {
 		return
 	}
+
 	s.mu.Lock()
 	defer s.mu.Unlock()
+	if !s.isRecording() {
+		return
+	}
 	if s.status.Code > code {
 		return
 	}
@@ -210,12 +225,15 @@ func (s *recordingSpan) SetStatus(code codes.Code, description string) {
 // attributes the span is configured to have, the last added attributes will
 // be dropped.
 func (s *recordingSpan) SetAttributes(attributes ...attribute.KeyValue) {
-	if !s.IsRecording() {
+	if s == nil || len(attributes) == 0 {
 		return
 	}
 
 	s.mu.Lock()
 	defer s.mu.Unlock()
+	if !s.isRecording() {
+		return
+	}
 
 	limit := s.tracer.provider.spanLimits.AttributeCountLimit
 	if limit == 0 {
@@ -233,7 +251,7 @@ func (s *recordingSpan) SetAttributes(attributes ...attribute.KeyValue) {
 
 	// Otherwise, add without deduplication. When attributes are read they
 	// will be deduplicated, optimizing the operation.
-	s.attributes = slices.Grow(s.attributes, len(s.attributes)+len(attributes))
+	s.attributes = slices.Grow(s.attributes, len(attributes))
 	for _, a := range attributes {
 		if !a.Valid() {
 			// Drop all invalid attributes.
@@ -280,13 +298,17 @@ func (s *recordingSpan) addOverCapAttrs(limit int, attrs []attribute.KeyValue) {
 
 	// Do not set a capacity when creating this map. Benchmark testing has
 	// showed this to only add unused memory allocations in general use.
-	exists := make(map[attribute.Key]int)
-	s.dedupeAttrsFromRecord(&exists)
+	exists := make(map[attribute.Key]int, len(s.attributes))
+	s.dedupeAttrsFromRecord(exists)
 
 	// Now that s.attributes is deduplicated, adding unique attributes up to
 	// the capacity of s will not over allocate s.attributes.
-	sum := len(attrs) + len(s.attributes)
-	s.attributes = slices.Grow(s.attributes, min(sum, limit))
+
+	// max size = limit
+	maxCap := min(len(attrs)+len(s.attributes), limit)
+	if cap(s.attributes) < maxCap {
+		s.attributes = slices.Grow(s.attributes, maxCap-cap(s.attributes))
+	}
 	for _, a := range attrs {
 		if !a.Valid() {
 			// Drop all invalid attributes.
@@ -296,6 +318,7 @@ func (s *recordingSpan) addOverCapAttrs(limit int, attrs []attribute.KeyValue) {
 
 		if idx, ok := exists[a.Key]; ok {
 			// Perform all updates before dropping, even when at capacity.
+			a = truncateAttr(s.tracer.provider.spanLimits.AttributeValueLengthLimit, a)
 			s.attributes[idx] = a
 			continue
 		}
@@ -386,9 +409,10 @@ func (s *recordingSpan) End(options ...trace.SpanEndOption) {
 	// the span's duration in case some operation below takes a while.
 	et := monotonicEndTime(s.startTime)
 
-	// Do relative expensive check now that we have an end time and see if we
-	// need to do any more processing.
-	if !s.IsRecording() {
+	// Lock the span now that we have an end time and see if we need to do any more processing.
+	s.mu.Lock()
+	if !s.isRecording() {
+		s.mu.Unlock()
 		return
 	}
 
@@ -413,10 +437,11 @@ func (s *recordingSpan) End(options ...trace.SpanEndOption) {
 	}
 
 	if s.executionTracerTaskEnd != nil {
+		s.mu.Unlock()
 		s.executionTracerTaskEnd()
+		s.mu.Lock()
 	}
 
-	s.mu.Lock()
 	// Setting endTime to non-zero marks the span as ended and not recording.
 	if config.Timestamp().IsZero() {
 		s.endTime = et
@@ -450,7 +475,13 @@ func monotonicEndTime(start time.Time) time.Time {
 // does not change the Span status. If this span is not being recorded or err is nil
 // than this method does nothing.
 func (s *recordingSpan) RecordError(err error, opts ...trace.EventOption) {
-	if s == nil || err == nil || !s.IsRecording() {
+	if s == nil || err == nil {
+		return
+	}
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if !s.isRecording() {
 		return
 	}
 
@@ -486,14 +517,23 @@ func recordStackTrace() string {
 }
 
 // AddEvent adds an event with the provided name and options. If this span is
-// not being recorded than this method does nothing.
+// not being recorded then this method does nothing.
 func (s *recordingSpan) AddEvent(name string, o ...trace.EventOption) {
-	if !s.IsRecording() {
+	if s == nil {
+		return
+	}
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if !s.isRecording() {
 		return
 	}
 	s.addEvent(name, o...)
 }
 
+// addEvent adds an event with the provided name and options.
+//
+// This method assumes s.mu.Lock is held by the caller.
 func (s *recordingSpan) addEvent(name string, o ...trace.EventOption) {
 	c := trace.NewEventConfig(o...)
 	e := Event{Name: name, Attributes: c.Attributes(), Time: c.Timestamp()}
@@ -510,20 +550,21 @@ func (s *recordingSpan) addEvent(name string, o ...trace.EventOption) {
 		e.Attributes = e.Attributes[:limit]
 	}
 
-	s.mu.Lock()
 	s.events.add(e)
-	s.mu.Unlock()
 }
 
 // SetName sets the name of this span. If this span is not being recorded than
 // this method does nothing.
 func (s *recordingSpan) SetName(name string) {
-	if !s.IsRecording() {
+	if s == nil {
 		return
 	}
 
 	s.mu.Lock()
 	defer s.mu.Unlock()
+	if !s.isRecording() {
+		return
+	}
 	s.name = name
 }
 
@@ -579,29 +620,26 @@ func (s *recordingSpan) Attributes() []attribute.KeyValue {
 func (s *recordingSpan) dedupeAttrs() {
 	// Do not set a capacity when creating this map. Benchmark testing has
 	// showed this to only add unused memory allocations in general use.
-	exists := make(map[attribute.Key]int)
-	s.dedupeAttrsFromRecord(&exists)
+	exists := make(map[attribute.Key]int, len(s.attributes))
+	s.dedupeAttrsFromRecord(exists)
 }
 
 // dedupeAttrsFromRecord deduplicates the attributes of s to fit capacity
 // using record as the record of unique attribute keys to their index.
 //
 // This method assumes s.mu.Lock is held by the caller.
-func (s *recordingSpan) dedupeAttrsFromRecord(record *map[attribute.Key]int) {
+func (s *recordingSpan) dedupeAttrsFromRecord(record map[attribute.Key]int) {
 	// Use the fact that slices share the same backing array.
 	unique := s.attributes[:0]
 	for _, a := range s.attributes {
-		if idx, ok := (*record)[a.Key]; ok {
+		if idx, ok := record[a.Key]; ok {
 			unique[idx] = a
 		} else {
 			unique = append(unique, a)
-			(*record)[a.Key] = len(unique) - 1
+			record[a.Key] = len(unique) - 1
 		}
 	}
-	// s.attributes have element types of attribute.KeyValue. These types are
-	// not pointers and they themselves do not contain pointer fields,
-	// therefore the duplicate values do not need to be zeroed for them to be
-	// garbage collected.
+	clear(s.attributes[len(unique):]) // Erase unneeded elements to let GC collect objects.
 	s.attributes = unique
 }
 
@@ -642,7 +680,7 @@ func (s *recordingSpan) InstrumentationScope() instrumentation.Scope {
 
 // InstrumentationLibrary returns the instrumentation.Library associated with
 // the Tracer that created this span.
-func (s *recordingSpan) InstrumentationLibrary() instrumentation.Library {
+func (s *recordingSpan) InstrumentationLibrary() instrumentation.Library { //nolint:staticcheck // This method needs to be define for backwards compatibility
 	s.mu.Lock()
 	defer s.mu.Unlock()
 	return s.tracer.instrumentationScope
@@ -657,7 +695,7 @@ func (s *recordingSpan) Resource() *resource.Resource {
 }
 
 func (s *recordingSpan) AddLink(link trace.Link) {
-	if !s.IsRecording() {
+	if s == nil {
 		return
 	}
 	if !link.SpanContext.IsValid() && len(link.Attributes) == 0 &&
@@ -665,6 +703,12 @@ func (s *recordingSpan) AddLink(link trace.Link) {
 		return
 	}
 
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if !s.isRecording() {
+		return
+	}
+
 	l := Link{SpanContext: link.SpanContext, Attributes: link.Attributes}
 
 	// Discard attributes over limit.
@@ -678,9 +722,7 @@ func (s *recordingSpan) AddLink(link trace.Link) {
 		l.Attributes = l.Attributes[:limit]
 	}
 
-	s.mu.Lock()
 	s.links.add(l)
-	s.mu.Unlock()
 }
 
 // DroppedAttributes returns the number of attributes dropped by the span
@@ -755,12 +797,16 @@ func (s *recordingSpan) snapshot() ReadOnlySpan {
 }
 
 func (s *recordingSpan) addChild() {
-	if !s.IsRecording() {
+	if s == nil {
 		return
 	}
+
 	s.mu.Lock()
+	defer s.mu.Unlock()
+	if !s.isRecording() {
+		return
+	}
 	s.childSpanCount++
-	s.mu.Unlock()
 }
 
 func (*recordingSpan) private() {}

vendor/go.opentelemetry.io/otel/sdk/version.go

@@ -5,5 +5,5 @@ package sdk // import "go.opentelemetry.io/otel/sdk"
 
 // Version is the current release version of the OpenTelemetry SDK in use.
 func Version() string {
-	return "1.28.0"
+	return "1.32.0"
 }

vendor/go.opentelemetry.io/otel/semconv/v1.24.0/README.md

@@ -1,3 +0,0 @@
-# Semconv v1.24.0
-
-[![PkgGoDev](https://pkg.go.dev/badge/go.opentelemetry.io/otel/semconv/v1.24.0)](https://pkg.go.dev/go.opentelemetry.io/otel/semconv/v1.24.0)

vendor/go.opentelemetry.io/otel/semconv/v1.24.0/doc.go

@@ -1,9 +0,0 @@
-// Copyright The OpenTelemetry Authors
-// SPDX-License-Identifier: Apache-2.0
-
-// Package semconv implements OpenTelemetry semantic conventions.
-//
-// OpenTelemetry semantic conventions are agreed standardized naming
-// patterns for OpenTelemetry things. This package represents the v1.24.0
-// version of the OpenTelemetry semantic conventions.
-package semconv // import "go.opentelemetry.io/otel/semconv/v1.24.0"

vendor/go.opentelemetry.io/otel/semconv/v1.24.0/event.go

@@ -1,200 +0,0 @@
-// Copyright The OpenTelemetry Authors
-// SPDX-License-Identifier: Apache-2.0
-
-// Code generated from semantic convention specification. DO NOT EDIT.
-
-package semconv // import "go.opentelemetry.io/otel/semconv/v1.24.0"
-
-import "go.opentelemetry.io/otel/attribute"
-
-// This event represents an occurrence of a lifecycle transition on the iOS
-// platform.
-const (
-	// IosStateKey is the attribute Key conforming to the "ios.state" semantic
-	// conventions. It represents the this attribute represents the state the
-	// application has transitioned into at the occurrence of the event.
-	//
-	// Type: Enum
-	// RequirementLevel: Required
-	// Stability: experimental
-	// Note: The iOS lifecycle states are defined in the [UIApplicationDelegate
-	// documentation](https://developer.apple.com/documentation/uikit/uiapplicationdelegate#1656902),
-	// and from which the `OS terminology` column values are derived.
-	IosStateKey = attribute.Key("ios.state")
-)
-
-var (
-	// The app has become `active`. Associated with UIKit notification `applicationDidBecomeActive`
-	IosStateActive = IosStateKey.String("active")
-	// The app is now `inactive`. Associated with UIKit notification `applicationWillResignActive`
-	IosStateInactive = IosStateKey.String("inactive")
-	// The app is now in the background. This value is associated with UIKit notification `applicationDidEnterBackground`
-	IosStateBackground = IosStateKey.String("background")
-	// The app is now in the foreground. This value is associated with UIKit notification `applicationWillEnterForeground`
-	IosStateForeground = IosStateKey.String("foreground")
-	// The app is about to terminate. Associated with UIKit notification `applicationWillTerminate`
-	IosStateTerminate = IosStateKey.String("terminate")
-)
-
-// This event represents an occurrence of a lifecycle transition on the Android
-// platform.
-const (
-	// AndroidStateKey is the attribute Key conforming to the "android.state"
-	// semantic conventions. It represents the this attribute represents the
-	// state the application has transitioned into at the occurrence of the
-	// event.
-	//
-	// Type: Enum
-	// RequirementLevel: Required
-	// Stability: experimental
-	// Note: The Android lifecycle states are defined in [Activity lifecycle
-	// callbacks](https://developer.android.com/guide/components/activities/activity-lifecycle#lc),
-	// and from which the `OS identifiers` are derived.
-	AndroidStateKey = attribute.Key("android.state")
-)
-
-var (
-	// Any time before Activity.onResume() or, if the app has no Activity, Context.startService() has been called in the app for the first time
-	AndroidStateCreated = AndroidStateKey.String("created")
-	// Any time after Activity.onPause() or, if the app has no Activity, Context.stopService() has been called when the app was in the foreground state
-	AndroidStateBackground = AndroidStateKey.String("background")
-	// Any time after Activity.onResume() or, if the app has no Activity, Context.startService() has been called when the app was in either the created or background states
-	AndroidStateForeground = AndroidStateKey.String("foreground")
-)
-
-// This semantic convention defines the attributes used to represent a feature
-// flag evaluation as an event.
-const (
-	// FeatureFlagKeyKey is the attribute Key conforming to the
-	// "feature_flag.key" semantic conventions. It represents the unique
-	// identifier of the feature flag.
-	//
-	// Type: string
-	// RequirementLevel: Required
-	// Stability: experimental
-	// Examples: 'logo-color'
-	FeatureFlagKeyKey = attribute.Key("feature_flag.key")
-
-	// FeatureFlagProviderNameKey is the attribute Key conforming to the
-	// "feature_flag.provider_name" semantic conventions. It represents the
-	// name of the service provider that performs the flag evaluation.
-	//
-	// Type: string
-	// RequirementLevel: Recommended
-	// Stability: experimental
-	// Examples: 'Flag Manager'
-	FeatureFlagProviderNameKey = attribute.Key("feature_flag.provider_name")
-
-	// FeatureFlagVariantKey is the attribute Key conforming to the
-	// "feature_flag.variant" semantic conventions. It represents the sHOULD be
-	// a semantic identifier for a value. If one is unavailable, a stringified
-	// version of the value can be used.
-	//
-	// Type: string
-	// RequirementLevel: Recommended
-	// Stability: experimental
-	// Examples: 'red', 'true', 'on'
-	// Note: A semantic identifier, commonly referred to as a variant, provides
-	// a means
-	// for referring to a value without including the value itself. This can
-	// provide additional context for understanding the meaning behind a value.
-	// For example, the variant `red` maybe be used for the value `#c05543`.
-	//
-	// A stringified version of the value can be used in situations where a
-	// semantic identifier is unavailable. String representation of the value
-	// should be determined by the implementer.
-	FeatureFlagVariantKey = attribute.Key("feature_flag.variant")
-)
-
-// FeatureFlagKey returns an attribute KeyValue conforming to the
-// "feature_flag.key" semantic conventions. It represents the unique identifier
-// of the feature flag.
-func FeatureFlagKey(val string) attribute.KeyValue {
-	return FeatureFlagKeyKey.String(val)
-}
-
-// FeatureFlagProviderName returns an attribute KeyValue conforming to the
-// "feature_flag.provider_name" semantic conventions. It represents the name of
-// the service provider that performs the flag evaluation.
-func FeatureFlagProviderName(val string) attribute.KeyValue {
-	return FeatureFlagProviderNameKey.String(val)
-}
-
-// FeatureFlagVariant returns an attribute KeyValue conforming to the
-// "feature_flag.variant" semantic conventions. It represents the sHOULD be a
-// semantic identifier for a value. If one is unavailable, a stringified
-// version of the value can be used.
-func FeatureFlagVariant(val string) attribute.KeyValue {
-	return FeatureFlagVariantKey.String(val)
-}
-
-// RPC received/sent message.
-const (
-	// MessageCompressedSizeKey is the attribute Key conforming to the
-	// "message.compressed_size" semantic conventions. It represents the
-	// compressed size of the message in bytes.
-	//
-	// Type: int
-	// RequirementLevel: Optional
-	// Stability: experimental
-	MessageCompressedSizeKey = attribute.Key("message.compressed_size")
-
-	// MessageIDKey is the attribute Key conforming to the "message.id"
-	// semantic conventions. It represents the mUST be calculated as two
-	// different counters starting from `1` one for sent messages and one for
-	// received message.
-	//
-	// Type: int
-	// RequirementLevel: Optional
-	// Stability: experimental
-	// Note: This way we guarantee that the values will be consistent between
-	// different implementations.
-	MessageIDKey = attribute.Key("message.id")
-
-	// MessageTypeKey is the attribute Key conforming to the "message.type"
-	// semantic conventions. It represents the whether this is a received or
-	// sent message.
-	//
-	// Type: Enum
-	// RequirementLevel: Optional
-	// Stability: experimental
-	MessageTypeKey = attribute.Key("message.type")
-
-	// MessageUncompressedSizeKey is the attribute Key conforming to the
-	// "message.uncompressed_size" semantic conventions. It represents the
-	// uncompressed size of the message in bytes.
-	//
-	// Type: int
-	// RequirementLevel: Optional
-	// Stability: experimental
-	MessageUncompressedSizeKey = attribute.Key("message.uncompressed_size")
-)
-
-var (
-	// sent
-	MessageTypeSent = MessageTypeKey.String("SENT")
-	// received
-	MessageTypeReceived = MessageTypeKey.String("RECEIVED")
-)
-
-// MessageCompressedSize returns an attribute KeyValue conforming to the
-// "message.compressed_size" semantic conventions. It represents the compressed
-// size of the message in bytes.
-func MessageCompressedSize(val int) attribute.KeyValue {
-	return MessageCompressedSizeKey.Int(val)
-}
-
-// MessageID returns an attribute KeyValue conforming to the "message.id"
-// semantic conventions. It represents the mUST be calculated as two different
-// counters starting from `1` one for sent messages and one for received
-// message.
-func MessageID(val int) attribute.KeyValue {
-	return MessageIDKey.Int(val)
-}
-
-// MessageUncompressedSize returns an attribute KeyValue conforming to the
-// "message.uncompressed_size" semantic conventions. It represents the
-// uncompressed size of the message in bytes.
-func MessageUncompressedSize(val int) attribute.KeyValue {
-	return MessageUncompressedSizeKey.Int(val)
-}

vendor/go.opentelemetry.io/otel/semconv/v1.24.0/exception.go

@@ -1,9 +0,0 @@
-// Copyright The OpenTelemetry Authors
-// SPDX-License-Identifier: Apache-2.0
-
-package semconv // import "go.opentelemetry.io/otel/semconv/v1.24.0"
-
-const (
-	// ExceptionEventName is the name of the Span event representing an exception.
-	ExceptionEventName = "exception"
-)