Monitoring Dashboard Design

Format: Design a monitoring dashboard for your production environment.

Must-monitor metrics:

Health Metrics:
- Is the app online (Uptime)
- Response time (P50, P95, P99)
- Error rate (5xx error percentage)
- CPU/Memory usage

Business Metrics:
- Active user count
- Registration/Login success rate
- Core feature usage rate
- Payment success rate (if applicable)

Recommended tools: Sentry (error monitoring) + UptimeRobot (availability) + Vercel Analytics (performance)