feat(observability): integrate OpenTelemetry collector and configuration for enhanced telemetry

docker/docker-compose.yml

@@ -61,6 +61,29 @@ services:
       timeout: 5s
       retries: 5
 
+  otel-collector:
+    image: otel/opentelemetry-collector-contrib:0.152.1
+    profiles:
+      - observability
+    command: ["--config=/etc/otelcol/config.yaml"]
+    volumes:
+      - ./otel-collector/config.yaml:/etc/otelcol/config.yaml:ro
+    environment:
+      GRAFANA_CLOUD_OTLP_ENDPOINT: ${GRAFANA_CLOUD_OTLP_ENDPOINT:-}
+      GRAFANA_CLOUD_INSTANCE_ID: ${GRAFANA_CLOUD_INSTANCE_ID:-}
+      GRAFANA_CLOUD_API_KEY: ${GRAFANA_CLOUD_API_KEY:-}
+    ports:
+      - "${OTEL_GRPC_PORT:-4317}:4317"
+      - "${OTEL_HTTP_PORT:-4318}:4318"
+      - "${OTEL_HEALTH_PORT:-13133}:13133"
+    mem_limit: 2g
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "/otelcol-contrib", "--version"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+
   searxng:
     image: searxng/searxng:2026.3.13-3c1f68c59
     volumes: