You currently have a web application hosted in an Azure Web App. Application Insights are monitoring this. You have to ensure that alerts are sent when there is a sudden rise in performance issues and failures. Which of the following can you use for this purpose?

Answer options:

A.Application Insights Profiler
B.Continuous export
C.Smart Detection
D.Custom events

Answer – C 
This can be achieved with the Smart Detection feature in Application Insights. The Smart Detection feature is able to perform proactive analysis and detect any potential issues in your web application. 
Option A is incorrect since this is used to capture and view performance traces in your application. 
Option B is incorrect since this is used to export Application Insights data onto a storage account. 
Option D is incorrect since here we don’t have to define any sort of Custom events. 
For more information on Smart detection in Application Insights, you can refer to the below link- 

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