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

Published Nov 12 2019 12:53 PM 3,239 Views

Final Update: Tuesday, 03 December 2019 22:48 UTC

We've confirmed that all systems are back to normal and the customers using .NET Core web applications monitored with Application Insights hosted in App Services no longer experience exceptions.

  • The fix was rolled out across all regions.

We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.

 

-Saika

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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=4.0.4.0, 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.

-Venkat

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Version history
Last update:
‎Dec 03 2019 02:53 PM
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