compose.demo.yml

# Demo overlay: a tiny auto-instrumented FastAPI service plus a load
# generator, so the stack has real traces, metrics, and correlated logs
# to show. Not for production — no restart-across-reboots on purpose.
#
#   just demo        # core stack + this overlay
#   just demo-down   # remove just the demo services

x-demo-logging: &demo-logging
  driver: json-file
  options:
    max-size: "10m"
    max-file: "3"

services:
  demo-api:
    build: ./demo
    restart: on-failure
    depends_on: [ otel-collector ]
    environment:
      OTEL_SERVICE_NAME: demo-api
      OTEL_RESOURCE_ATTRIBUTES: env=demo
      OTEL_EXPORTER_OTLP_ENDPOINT: http://otel-collector:4318
      OTEL_EXPORTER_OTLP_PROTOCOL: http/protobuf
      OTEL_EXPORTER_OTLP_HEADERS: Authorization=Bearer ${OTLP_AUTH_TOKEN:?set OTLP_AUTH_TOKEN in .env}
      # Traces/metrics/logs exporters all default to otlp via opentelemetry-distro.
      # Ship Python log records via OTLP with trace context attached.
      OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED: "true"
      OTEL_METRIC_EXPORT_INTERVAL: "10000"
      # Emit the *stable* HTTP semconv (http.server.request.duration in seconds,
      # http.route) rather than the legacy names. Stable metric names are frozen,
      # so the Service Health dashboard's app-SDK panel survives library bumps.
      OTEL_SEMCONV_STABILITY_OPT_IN: http
    logging: *demo-logging

  demo-load:
    image: curlimages/curl:8.21.0
    restart: on-failure
    depends_on: [ demo-api ]
    command:
      - sh
      - -c
      - |
        while true; do
          curl -s -o /dev/null demo-api:8000/
          curl -s -o /dev/null demo-api:8000/work
          sleep 1
        done
    logging: *demo-logging