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  feat(observability): instrument AI + HTTP paths, serve /metrics on a side port (ADR-030, #15)

  mathias released this 2026-06-12 06:49:51 +00:00 | 19 commits to main since this release

  Wire the metrics package into the live paths and serve it:

  • summarizer: per-endpoint latency by model/outcome(success|error|parse_error)/fallback + slog.
  • youtube.FetchTranscript: latency by outcome (captions|none|rate_limited) + slog.
  • chat: answer latency by model + slog.
  • llm usage hook → token counts (prompt|completion) per model, wired in buildSummarizer/buildChat.
  • oidc callback: login counter.
  • cmdServe: wrap Router in metrics.HTTPMiddleware (request count + latency by bounded
    route pattern) and serve /metrics on TAPIR_METRICS_ADDR (default :9090), a SEPARATE
    port — never on the public app mux.

  BDD: observability.feature scenarios un-pended + mapped. TDD: summarizer wiring tested
  black-box via the /metrics scrape; metrics-not-on-public-mux asserted.

  Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

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