Issues with .Net Core web applications in App Services monitored with Application Insights – 11/12

This post has been republished via RSS; it originally appeared at: New blog articles in Microsoft Tech Community.

Update: Tuesday, 12 November 2019 20:50 UTC

Customers using .NET Core web applications monitored with Application Insights hosted in App Services in rare cases might experience crashes with following exception:
"System.IO.FileNotFoundException: Could not load file or assembly 'System.Diagnostics.DiagnosticSource, Version=, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified."

Such exception can happen when .NET Core web application has a dependency on 'System.Diagnostics.DiagnosticSource%u2019 binary and has this binary file deployed to %u2018wwwroot%u2019 folder, which is rare.

We are aware of the issue and are rolling out the fix across different regions.

  • Work Around:  Please set previous version of monitoring extension by changing this app setting if you experience the above issue: ApplicationInsightsAgent_EXTENSIONVERSION=2.8.24
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.


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