fix: remove unused vars

.env.sample

@@ -54,6 +54,9 @@ SECRET_BASIC_AUTH_VERSION=v1
 # SYSLOG=1
 # COMPOSE_FILE="$COMPOSE_FILE:compose.syslog.yml"
 
+# Monitor physical disks health
+# COMPOSE_FILE="$COMPOSE_FILE:compose.smartctl.yml"
+
 # Monitoring Server
 #
 ## Prometheus

README.md

@@ -166,3 +166,11 @@ It is possible to enable the following alerts, by uncommenting the corresponding
 
 - node disk space: `ALERT_NODE_DISK_SPACE_LEFT`
 - node memory usage: `ALERT_NODE_MEMORY_USAGE`
+
+## smart monitoring
+
+To be able monitor hard drive health data, you need to configure
+`smartd` to run on the host system, and also the
+`collect-smartctl-json.sh` script provided here (via cronjob or as
+a `smartd` hook).  This is a limitation on Docker Swarm, which prevents
+the `smartctl_exporter` from running on privileged mode.

collect-smartctl-json.service

@@ -0,0 +1,6 @@
+[Unit]
+Description=Collect SMART data
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/bin/collect-smartctl-json.sh

collect-smartctl-json.sh

@@ -0,0 +1,61 @@
+#! /bin/bash
+# Adapted from https://github.com/prometheus-community/smartctl_exporter/blob/master/collect-smartctl-json.sh
+
+# Data directory to dump smartctl output
+# This directory will be created if it doesn't exist
+data_dir="/var/lib/smartmontools/json"
+
+# The original script used --xall but that doesn't work
+# This matches the command in readSMARTctl()
+smartctl_args="--json --info --health --attributes --tolerance=verypermissive \
+--nocheck=standby --format=brief --log=error"
+
+# Ignore this devices
+smartctl_ignore_dev_regex="^(/dev/bus)"
+
+# Determine the json query tool to use
+if command -v jq >/dev/null; then
+	json_tool="jq"
+	json_args="--raw-output"
+elif command -v yq >/dev/null; then
+	json_tool="yq"
+	json_args="--unwrapScalar"
+else
+	echo -e "One of 'yq' or 'jq' is required. Please try again after \
+installing one of them"
+	exit 1
+fi
+
+if [[ ! "${UID}" -eq 0 ]] && ! command -v sudo >/dev/null; then
+	# Not root and sudo doesn't exist
+	echo "sudo does not exist. Please run this as root"
+	exit 1
+fi
+
+SUDO="sudo"
+if [[ "${UID}" -eq 0 ]]; then
+	# Don't use sudo if root
+	SUDO=""
+fi
+
+[[ ! -d "${data_dir}" ]] && mkdir --parents "${data_dir}"
+
+if [[ $# -ne 0 ]]; then
+	devices="${1}"
+else
+	devices="$(smartctl --scan --json | "${json_tool}" "${json_args}" \
+".devices[].name | select(test(\"${smartctl_ignore_dev_regex}\") | not)")"
+  mapfile -t devices <<< "${devices[@]}"
+fi
+
+for device in "${devices[@]}"
+  do
+	echo -n "Collecting data for '${device}'..."
+	# shellcheck disable=SC2086
+	data="$($SUDO smartctl ${smartctl_args} ${device})"
+	# Accommodate a smartmontools pre-7.3 bug
+	data=${data#"  Pending defect count:"}
+	device_name="$(basename "${device}")"
+	echo -e "\tSaving to ${device_name}.json"
+	echo "${data}" > "${data_dir}/${device_name}.json"
+done

collect-smartctl-json.timer

@@ -0,0 +1,9 @@
+[Unit]
+Description=Collect SMART data
+
+[Timer]
+OnCalendar=hourly
+Persistent=true
+
+[Install]
+WantedBy=timers.target

compose.smartctl.yml

@@ -0,0 +1,17 @@
+---
+version: "3.8"
+services:
+  smartctl:
+    image: "prometheuscommunity/smartctl-exporter:v0.14.0"
+    volumes:
+    - "/var/lib/smartmontools/json:/debug"
+    command:
+    - "--smartctl.fake-data"
+    - "--smartctl.interval=1h"
+    networks:
+    - "proxy"
+    deploy:
+      labels:
+        - "prometheus.io/scrape=true"
+        - "prometheus.io/port=9633"
+        - "prometheus.io/path=/metrics"

config.alloy.tmpl

@@ -52,32 +52,7 @@ prometheus.scrape "default" {
     prometheus.exporter.cadvisor.docker.targets,
   )
 
-  forward_to = [prometheus.relabel.container_meta.receiver]
-}
-
-prometheus.relabel "container_meta" {
   forward_to = [prometheus.remote_write.prometheus.receiver]
-
-  // remove sha tail: nginx:1.31.1@sha256:608a... -> nginx:1.31.1
-  rule {
-    source_labels = ["image"]
-    regex         = "([^@]+)@sha256:.*"
-    target_label  = "image"
-    replacement   = "$1"
-  }
-  // split image in name and tag
-  rule {
-    source_labels = ["image"]
-    regex         = "(.+):[^:/]+"
-    target_label  = "image_name"
-    replacement   = "$1"
-  }
-  rule {
-    source_labels = ["image"]
-    regex         = ".+:([^:/]+)"
-    target_label  = "image_tag"
-    replacement   = "$1"
-  }
 }
 
 prometheus.remote_write "prometheus" {
@@ -134,11 +109,6 @@ discovery.relabel "metrics" {
     action        = "keep"
   }
 
-  rule {
-  action = "labelmap"
-  regex  = "__meta_dockerswarm_container_label_coop_cloud_(.+)"
-  }
-
   // default to port 80 when prometheus.io/port isn't set
   rule {
     source_labels = ["__meta_dockerswarm_service_label_prometheus_io_port"]
@@ -305,10 +275,6 @@ discovery.relabel "docker" {
     source_labels = ["__meta_docker_container_log_stream"]
     target_label  = "stream"
   }
-  rule {
-  action = "labelmap"
-  regex  = "__meta_docker_container_label_coop_cloud_(.+)"
-  }
 }
 
 loki.source.docker "docker" {
@@ -324,35 +290,7 @@ loki.source.docker "docker" {
 loki.source.journal "journal" {
   path = "/rootfs/var/log/journal"
   labels = { job = "{{ env "DOMAIN" }}" }
-  relabel_rules = loki.relabel.journal.rules
-  forward_to = [loki.process.journal.receiver]
-}
-
-loki.relabel "journal" {
-  forward_to = []
-
-  rule {
-    source_labels = ["__journal__systemd_unit"]
-    target_label  = "unit"
-  }
-  rule {
-    source_labels = ["__journal_syslog_identifier"]
-    target_label  = "ident"
-  }
-  rule {
-    source_labels = ["__journal_priority_keyword"]
-    target_label  = "priority"
-  }
-}
-
-// drop network db stats (15-20% of kernel logs)
-loki.process "journal" {
   forward_to = [loki.write.loki.receiver]
-
-  stage.drop {
-    expression          = ".*NetworkDB stats.*"
-    drop_counter_reason = "networkdb_stats"
-  }
 }
 {{ end }}