@RajeshAmb If you are planning to migrate your asp.net application to Azure web app, you can monitor it using Azure Application Insights which is sub feature of Azure Monitor.
Here are some references for monitoring Azure App Service with Azure Monitor which can get you started.
- https://learn.microsoft.com/en-us/azure/app-service/monitor-app-service
- https://learn.microsoft.com/en-us/azure/app-service/monitor-app-service-reference#metric-dimensions
Kindly go through the above articles and revert if you have further questions.