1af67eb0ce
Add Application Performance Monitoring (APM) with Prometheus metrics
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- Backend: Implement Prometheus metrics collection
- Add prometheus-client dependency
- Create metrics utility module with HTTP request tracking counters, histograms, gauges
- Implement MetricsMiddleware to track request latency, count, and active requests
- Add /metrics endpoint to expose metrics in Prometheus text format
- Normalize paths to prevent cardinality explosion (e.g., /api/{id} for UUIDs)
- Exclude /metrics and /health from detailed tracking
- Frontend: Add web vitals and API metrics collection
- Install web-vitals library (v4.0.0) for Core Web Vitals tracking
- Create metrics utility module for FCP, LCP, CLS, INP, TTFB collection
- Implement useTrackedFetch hook for automatic API call metrics (method, endpoint, status, duration)
- Initialize web vitals tracking in App component on mount
- Provide exportMetrics() for sending metrics to backend
- Testing:
- Add comprehensive backend metrics tests (9 tests, 100% coverage)
- Add comprehensive frontend metrics tests (10 tests)
- All tests passing
- Documentation:
- Expand Docs/Observability.md with complete APM section
- Include metrics reference, integration examples (Prometheus, Datadog, NewRelic)
- Add troubleshooting guide and best practices for cardinality management
- Update Tasks.md to mark APM task as complete
Metrics exposed:
- bangui_http_requests_total: HTTP request count by method, endpoint, status
- bangui_http_request_duration_seconds: Request latency histogram
- bangui_http_active_requests: Active request gauge
- Web Vitals: CLS, FCP, INP, LCP, TTFB with ratings
- API metrics: endpoint, method, status, duration, timestamp
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com >
2026-05-01 18:33:14 +02:00
