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feat: prometheus metrics endpoint - #12

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mateuseap merged 1 commit into
mainfrom
feat/prometheus-metrics
Jul 23, 2026
Merged

feat: prometheus metrics endpoint#12
mateuseap merged 1 commit into
mainfrom
feat/prometheus-metrics

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@mateuseap

@mateuseap mateuseap commented Jul 23, 2026

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Live usage and engine-load visibility for the Grafana dashboard.

Changes made

  • prom-client registry with hand-picked series only: chesskernel_games_active (sampled every 30s from an indexed count), chesskernel_socket_connections (gateway connect/disconnect), chesskernel_stockfish_running and chesskernel_stockfish_duration_seconds{op} (evaluate/bestmove wrapped)
  • GET /metrics excluded from the api global prefix: reachable in-cluster only, nginx never proxies it publicly

Test plan

  • Server build clean, 8/8 jest tests green
  • After deploy: Prometheus target Up, ChessKernel panels live in Grafana

@mateuseap
feat: prometheus metrics endpoint
6730bea 
- /metrics outside the api prefix (cluster-internal, not proxied)
- gauges: active games (30s DB sample), socket.io connections
- stockfish in-flight gauge + duration histogram by operation
@mateuseap mateuseap self-assigned this Jul 23, 2026
@mateuseap
mateuseap merged commit 85c8fe4 into main Jul 23, 2026
@mateuseap
mateuseap deleted the feat/prometheus-metrics branch July 23, 2026 13:48
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