majiayu000 Monitoring & Observability - System Health
When to use this skill
- Setting up application monitoring systems
- Implementing structured logging
- Creating metrics and performance dashboards
- Setting up alerts for critical issues
- Implementing distributed tracing
- Monitoring API performance and latency
- Tracking error rates and exceptions
- Building observability into applications
- Setting up log aggregation
- Creating SLO/SLA monitoring
- Implementing health checks
- Building incident detection systems
When to use this skill
- Setting up metrics, alerts, dashboards.
- When working on related tasks or features
- During development that requires this expertise
Use when: Setting up metrics, alerts, dashboards.
Three Pillars
- Metrics - Time-series data (CPU, memory, requests/sec)
- Logs - Event records with context
- Traces - Request flow through system
Example
```typescript import * as Sentry from '@sentry/node'; import { metrics } from './metrics';
app.use((req, res, next) => { const start = Date.now(); res.on('finish', () => { metrics.histogram('request_duration', Date.now() - start, { method: req.method, route: req.route?.path, status: res.statusCode }); }); next(); }); ```