Service ports

The default docker compose up stack publishes these ports on the host. Confirmed against docker-compose.yml.

3000   frontend           nginx serving the React app
3001   backend            Fastify API and /api/* routes
8000   model-service      FastAPI inference service
5432   postgres           pgvector/pgvector:pg16
6379   redis              BullMQ + session cache
4317   otel-collector     OTLP gRPC ingestion
4318   otel-collector     OTLP HTTP ingestion
8889   otel-collector     Prometheus self-metrics scrape
9090   prometheus         metrics database and UI
3002   grafana            dashboard UI

The collector self-metrics port (8889) is what Prometheus scrapes; application metrics flow through OTLP to the collector and are forwarded to Prometheus from there.

The frontend reverse-proxies /api/* to the backend in the production image, so a browser pointed at :3000 does not need to know about port 3001.