- Add phaseflow_build_info metric with version and commit labels
- Inject GIT_COMMIT env var at build time via next.config.ts
- Add logging to all Garmin fetch functions (HRV, body battery, intensity)
- Log API response status codes, actual data values, and errors
This enables verifying which build is deployed and diagnosing
silent failures where Garmin API returns errors but sync reports success.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add comprehensive metrics collection for production monitoring:
- src/lib/metrics.ts: prom-client based metrics library with custom counters,
gauges, and histograms for Garmin sync, email, and decision engine
- GET /api/metrics: Prometheus-format endpoint for scraping
- Integration into garmin-sync cron: sync duration, success/failure counts,
active users gauge
- Integration into email.ts: daily and warning email counters
- Integration into decision-engine.ts: decision type counters
Custom metrics implemented:
- phaseflow_garmin_sync_total (counter with status label)
- phaseflow_garmin_sync_duration_seconds (histogram)
- phaseflow_email_sent_total (counter with type label)
- phaseflow_decision_engine_calls_total (counter with decision label)
- phaseflow_active_users (gauge)
33 new tests (18 library + 15 route), bringing total to 586 tests.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
