Monitoring basics

Monitoring tells you when your live app breaks or slows down, ideally before users notice. Start with logs, error tracking (like Sentry), and uptime checks.

What to watch:
- Errors        -> Sentry, or your host's logs
- Uptime        -> UptimeRobot pings your site every few minutes
- Performance   -> Vercel Analytics / Speed Insights
- Logs          -> Vercel or Render dashboard

// Log useful info, not secrets
console.error("Payment failed", { orderId, status: res.status })