Web App Application Logs not being sent to Log Analytics

Question

I am running a ASP.NET V4.8 web app using a Azure Web Apps instance.

I am currently logging to a container blob using System.Diagnostics.Trace where the logs are stored in a CSV format but would like to be able to query logs and possibly set up alerts.

To do achieve this I have been following this guide here and created Diagnostics Settings in the App Service and a new Log Analytics Workspace. When triggering a call to Diagnostics.Trace.TraceError() I am able to see the error show up in the Log Stream and in the blob container. However in my Log Analytics Workspace when querying AppServiceAppLogs(and any other possible tables) I receive "No results found from the last 24 hours".

This is the same behaviour when I query logs from App Service > Monitoring > Logs

Any help would be greatly appreciated.

Answer 1

@AdamCollins-2199 , can you please run the query below in logs to see if any data is getting into the Application Insights (Logs are generally available in "traces" / "AppTraces" table) -

union *  

Depending on the output of the query, there could be 2 possibilities: -
1. None of the telemetry information is getting into Application Insights - in this case, please ensure that the Application Insights is enabled. There are 2 methods to enable it

• Auto-instrumentation
• using AppInsights SDK

Depending on the method chosen, you could also check the "Troubleshooting Guides" available in these links for troubleshooting purpose

2. Some data is getting to AppInsights - In this case, please see the following

• Configuring logging in ApplicationInsights (the "Troubleshooting" section here contains information of most common issues and how to solve them)

Hope this helps. Please let me know if you have any questions.