[otel-col] Add docker stats receiver (#1650)

* Add docker stats receiver

* changelog

* Nit: prevent write access to the Docker socket

Co-authored-by: Roger Coll <roger.coll@elastic.co>

* Add compose minimal

---------

Co-authored-by: Roger Coll <roger.coll@elastic.co>

.env

@@ -22,6 +22,7 @@ TRACETEST_IMAGE=kubeshop/tracetest:v1.3.0
 ENV_PLATFORM=local
 
 # OpenTelemetry Collector
+DOCKER_SOCK=/var/run/docker.sock
 OTEL_COLLECTOR_HOST=otelcol
 OTEL_COLLECTOR_PORT_GRPC=4317
 OTEL_COLLECTOR_PORT_HTTP=4318

CHANGELOG.md

@@ -18,8 +18,10 @@ the release.
   ([#1610](https://github.com/open-telemetry/opentelemetry-demo/pull/1610))
 * [Valkey] Replace Redis with Valkey
   ([#1619](https://github.com/open-telemetry/opentelemetry-demo/pull/1619))
-* ([recommendation] updated flag name to match flagd configuration
+* [recommendation] updated flag name to match flagd configuration
   ([#1634](https://github.com/open-telemetry/opentelemetry-demo/pull/1634))
+* [otel-col] Add docker stats receiver
+  ([#1650](https://github.com/open-telemetry/opentelemetry-demo/pull/1650))
 
 ## 1.10.0
 

docker-compose.minimal.yml

@@ -583,7 +583,9 @@ services:
           memory: 200M
     restart: unless-stopped
     command: [ "--config=/etc/otelcol-config.yml", "--config=/etc/otelcol-config-extras.yml" ]
+    user: 0:0
     volumes:
+      - ${DOCKER_SOCK}:/var/run/docker.sock:ro
       - ${OTEL_COLLECTOR_CONFIG}:/etc/otelcol-config.yml
       - ${OTEL_COLLECTOR_CONFIG_EXTRAS}:/etc/otelcol-config-extras.yml
     ports:

docker-compose.yml

@@ -693,7 +693,9 @@ services:
           memory: 200M
     restart: unless-stopped
     command: [ "--config=/etc/otelcol-config.yml", "--config=/etc/otelcol-config-extras.yml" ]
+    user: 0:0
     volumes:
+      - ${DOCKER_SOCK}:/var/run/docker.sock:ro
       - ${OTEL_COLLECTOR_CONFIG}:/etc/otelcol-config.yml
       - ${OTEL_COLLECTOR_CONFIG_EXTRAS}:/etc/otelcol-config-extras.yml
     ports:

src/otelcollector/otelcol-config.yml

@@ -13,10 +13,20 @@ receivers:
   httpcheck/frontendproxy:
     targets:
       - endpoint: http://frontendproxy:${env:ENVOY_PORT}
+  docker_stats:
+    endpoint: unix:///var/run/docker.sock
   redis:
     endpoint: "valkey-cart:6379"
     username: "valkey"
     collection_interval: 10s
+  # Collector metrics
+  prometheus:
+    config:
+      scrape_configs:
+        - job_name: 'otelcol'
+          scrape_interval: 10s
+          static_configs:
+            - targets: ['0.0.0.0:8888']
 
 exporters:
   debug:
@@ -48,7 +58,7 @@ service:
       processors: [batch]
       exporters: [otlp, debug, spanmetrics]
     metrics:
-      receivers: [httpcheck/frontendproxy, redis, otlp, spanmetrics]
+      receivers: [docker_stats, httpcheck/frontendproxy, otlp, prometheus, redis, spanmetrics]
       processors: [batch]
       exporters: [otlphttp/prometheus, debug]
     logs: