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This event occurs when a function app doesn't have a value for the FUNCTIONS_WORKER_RUNTIME application setting, which is required.
| Value | |
|---|---|
| Event ID | AZFD0011 |
| Severity | Warning |
Event description
The FUNCTIONS_WORKER_RUNTIME application setting indicates the language or language stack on which the function app runs, such as python. For more information on valid values, see the FUNCTIONS_WORKER_RUNTIME reference.
You should always specify a valid FUNCTIONS_WORKER_RUNTIME for your function apps. When you don't have this setting and the Functions host can't determine the correct language or language stack, you might see performance degradations, exceptions, or unexpected behaviors. To ensure that your application operates as intended, you should explicitly set it in all of your existing function apps and deployment scripts.
The value of FUNCTIONS_WORKER_RUNTIME should align with the language stack used to create the deployed application payload. If these do not align, you may see the AZFD0013 event.
How to resolve the event
In a production application, set FUNCTIONS_WORKER_RUNTIME to a valid value in the application settings. The value should align with the language stack used to create the application payload.
When running locally in Azure Functions Core Tools, also set FUNCTIONS_WORKER_RUNTIME to a valid value in the local.settings.json file. The value should align with the language stack used in the local project.
When to suppress the event
This event shouldn't be suppressed.