Setup: Next.js on Vercel.
Questions
How do I know when my Vercel app is down?
Vercel does not page you when your app breaks. Add an error and heartbeat reporter plus an on-call service. With Pagerless, one Next.js instrumentation file reports errors and 5xx per route; a 5xx burst or silence wakes you, and you can roll back to the previous deployment with one tap.