How do you debug an issue in production on Azure App Service?

Short answer: Use Application Insights to trace exceptions and request failures. Access Kudu console for logs and process inspection. Use Remote Debugging from Visual Studio. Example: Enabled detailed error messages and traced a null reference exception in production logs.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.