- Azure Functions supports two versions of the runtime host: 4.x and 1.x.
- Function apps running on versions 2.x and 3.x of the Azure Functions runtime have reached the end of extended support.
- The version of the Functions runtime used by published apps in Azure is dictated by the FUNCTIONS_EXTENSION_VERSION application setting.
- The article discusses the challenge of identifying Azure Function apps running on an unsupported runtime.
- The author attempted to use a Powershell script to filter out function apps with unsupported runtime versions but faced issues.
- After discussions with Azure MVPs, a working Powershell script was created to list all function apps running on an unsupported runtime.
- The script includes a custom column to display the FunctionRuntimeVersion for each function app.
- The complete script can be found on the author's GitHub repository for reference.
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