dvcrn Monitoring & Observability
Logging Best Practices
import pino from 'pino'
const logger = pino({
level: process.env.LOG_LEVEL || 'info',
formatters: {
level: (label) => ({ level: label }),
},
})
// Structured logging
logger.info({ userId: '123', action: 'login' }, 'User logged in')
logger.error({ err, userId: '123' }, 'Login failed')
Metrics vs Traces vs Logs
| Type | Purpose | Example |
|---|---|---|
| Metrics | Aggregated numbers | Request count, latency p95 |
| Traces | Request flow | Full request path |
| Logs | Events | Error details |
Alert Design
# Alert rules
- alert: HighErrorRate
expr: sum(rate(http_requests_total{status=~"5.."}[5m])) > 0.05
for: 5m
labels:
severity: critical
annotations:
description: Error rate > 5%
Checklist
- Use structured logging (JSON)
- Add request IDs for tracing
- Create key metrics (latency, error rate, throughput)
- Set up health checks
- Configure alerting thresholds
- Build dashboards