feat: send metrics to prometheus

.env.sample

@@ -19,6 +19,7 @@ ENABLE_BACKUPS=true
 #
 ## Prometheus
 # COMPOSE_FILE="$COMPOSE_FILE:compose.prometheus.yml"
+# PROMETHEUS_REMOTE_WRITE_URL=https://prometheus.$DOMAIN/api/v1/write
 # PROMETHEUS_RETENTION_TIME=1y
 #
 ## Prometheus Pushgateway

abra.sh

@@ -12,7 +12,7 @@ export PROMETHEUS_YML_VERSION=v2
 export MATRIX_ALERTMANAGER_CONFIG_VERSION=e
 export MATRIX_ALERTMANAGER_ENTRYPOINT_VERSION=a
 export GRAFANA_ALERTS_NODE_VERSION=v1c
-export CONFIG_ALLOY_VERSION=v2
+export CONFIG_ALLOY_VERSION=v4
 
 # creates a default prometheus scrape config for a given node
 add_node(){

compose.yml

@@ -16,6 +16,8 @@ services:
       - "/etc/alloy/config.alloy"
     networks:
       - internal
+    secrets:
+      - basic_auth
     deploy:
       restart_policy:
         condition: on-failure
@@ -34,3 +36,7 @@ networks:
   internal:
 volumes:
   alloy-data:
+secrets:
+  basic_auth:
+    external: true
+    name: ${STACK_NAME}_basic_auth_${SECRET_BASIC_AUTH_VERSION}

config.alloy.tmpl

@@ -5,3 +5,26 @@ logging {
 
 prometheus.exporter.cadvisor "docker" {
 }
+
+prometheus.scrape "default" {
+  targets = array.concat(
+    [{
+      job         = "alloy",
+      __address__ = "127.0.0.1:12345",
+    }],
+    prometheus.exporter.cadvisor.docker.targets,
+  )
+
+  forward_to = [prometheus.remote_write.prometheus.receiver]
+}
+
+prometheus.remote_write "prometheus" {
+  endpoint {
+    url = "{{ env "PROMETHEUS_REMOTE_WRITE_URL" }}"
+
+    basic_auth {
+      username = "admin"
+      password = "{{ secret "basic_auth" }}"
+    }
+  }
+}