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Chapter 16 · 06

Monitoring and Error Tracking

Once people use your app, you need to know when it breaks — ideally before they tell you. The lightweight starter kit:

  • Error tracking: Sentry catches and groups exceptions with stack traces, and tells you which user and which line triggered each one. A few lines to install.
  • Uptime monitoring: a free pinger (UptimeRobot, Better Stack) hits your site every few minutes and emails you when it goes down.
  • Logs: know where your host keeps them (wrangler tail, the Vercel dashboard, etc.) so you can investigate when something looks wrong.

Have the AI add Sentry and wire a basic health-check — a tiny route like /health that returns 200 OK and confirms the is reachable, which your uptime monitor can ping. The goal is not enterprise observability — it is simply not finding out about an outage from an angry tweet.

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