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turniere-backend/doc/metrics.md

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Metrics

The backend exposes Prometheus text metrics at GET /metrics.

The endpoint is unauthenticated so monitoring systems can scrape it directly. It reports per-process in-memory values:

  • turniere_http_requests_total
  • turniere_http_request_duration_seconds
  • turniere_action_cable_connections
  • turniere_action_cable_connections_total
  • turniere_process_uptime_seconds
  • turniere_ruby_threads
  • turniere_active_record_connection_pool
  • turniere_build_info

This covers app-level request and websocket health. Logs, traces, host metrics, and multi-process aggregation should remain infrastructure concerns. If Puma is ever run with multiple worker processes, scrape each process or container replica and aggregate in the monitoring backend.