services:
  fluentbit:
    image: fluent/fluent-bit:3.1.7-debug
    ports:
      # Port 24224 intentionally fixed: the Docker fluentd log driver sets
      # fluentd-address at service-start time (see compose.yaml and
      # TestLoggingDriver in compose_up_test.go). Dynamic resolution would
      # require a two-phase compose up which is unnecessarily invasive.
      # TestLoggingDriver is serial (no t.Parallel()), so collision risk is nil.
      - "24224:24224"
      - "24224:24224/udp"
    environment:
      FOO: ${BAR}

  app:
    image: alpine
    init: true
    command: sleep infinity
    depends_on:
      fluentbit:
        condition: service_started
        restart: true
    logging:
      driver: fluentd
      options:
        fluentd-address: ${HOST:-127.0.0.1}:24224