Microsoft Exam AZ-400 Topic 2 Question 28 Discussion

Smart Detection automatically warns you of potential performance problems and failure anomalies in your web application. It performs proactive analysis of the telemetry that your app sends to Application Insights. If there is a sudden rise in failure rates, or abnormal patterns in client or server performance, you get an alert.

https://docs.microsoft.com/en-us/azure/azure-monitor/app/proactive-diagnostics