API Tracing
Measure API requests and correlate with backend traces.
What to Capture (OTel-Compatible)
| Attribute | OTel Name | Purpose |
|---|---|---|
| Method | http.request.method | GET, POST, etc. |
| Status | http.response.status_code | Success/failure |
| URL | url.path | Endpoint (sanitized) |
| Duration | http.request.duration | Request time (ms) |
Using OTel naming now = easier migration later.
Key Thresholds
| Metric | Good | Acceptable | Poor |
|---|---|---|---|
| p50 | <200ms | <500ms | >500ms |
| p95 | <1s | <2s | >2s |
| Error rate | <0.1% | <1% | >1% |
What NOT to Log
| Don't | Why |
|---|---|
| Request bodies | PII risk |
| Auth headers | Security |
| Full response data | Size limits |
| User tokens | Security |
Do log: Request ID, sanitized path, status code, duration, error type.
Implementation
See templates/api-interceptor.ts for fetch/axios interceptors.
Use Read tool to load template when generating implementation.
Related
- •
skills/error-tracking- API error handling - •
skills/route-transition-tracking- Data fetch during navigation - •
references/otel-web.md- OpenTelemetry naming