services:
  newt:
    build: .
    image: newt:dev
    env_file:
      - .env
    environment:
      - NEWT_METRICS_PROMETHEUS_ENABLED=false   # important: disable direct /metrics scraping
      - NEWT_METRICS_OTLP_ENABLED=true          # OTLP to the Collector
      # optional:
      # - NEWT_METRICS_INCLUDE_TUNNEL_ID=false
  # When using the Collector pattern, do NOT map the Newt admin/metrics port
  # (2112) on the application service. Mapping 2112 here can cause port
  # conflicts and may result in duplicated Prometheus scraping (app AND
  # collector being scraped for the same metrics). Instead either:
  #  - leave ports unset on the app service (recommended), or
  #  - map 2112 only on a dedicated metrics/collector service that is
  #    responsible for exposing metrics to Prometheus.
  # Example: do NOT map here
  # ports: []
  # Example: map 2112 only on a collector service
  # collector:
  #   ports:
  #     - "2112:2112"  # collector's prometheus exporter (scraped by Prometheus)

  otel-collector:
    image: otel/opentelemetry-collector-contrib:latest
    command: ["--config=/etc/otelcol/config.yaml"]
    volumes:
      - ./examples/otel-collector.yaml:/etc/otelcol/config.yaml:ro
    ports:
      - "4317:4317"   # OTLP gRPC
      - "8889:8889"   # Prometheus Exporter (scraped by Prometheus)

  prometheus:
    image: prom/prometheus:latest
    volumes:
      - ./examples/prometheus.with-collector.yml:/etc/prometheus/prometheus.yml:ro
    ports:
      - "9090:9090"