Function App not logging to Log Analytics workspace defined in Diagnostic Settings

Question

Function App not logging to Log Analytics workspace defined in Diagnostic Settings

Steven Stermer 0

I've got 3 Function Apps representing 3 different environments. These functions apps are all set, via the diagnostic settings, to log to a Log Analytics workspace (the same workspace for all apps). 2 of the 3 environments successfully do this. The 3rd did this until around 2 days ago when the logs show a "Job Host Stopped" call as the last entry. At current, the function apps are all running the exact same code, with the same setup of environment variables (although different values).

Watching the log stream of the problem Function App shows the logs, they just never make it to the Log Analytics workspace. As a test, I also added a storage account to the Diagnostics Settings (under the same setting that is set to go to the workspace) and nothing appears in it's container either.

Not really sure what to investigate from here, most Stack Overflow issues point to a code-level configuration issue, but that can't be the case since it successfully works with the other environments.

Ryan Hill 30,281 Reputation points Microsoft Employee Moderator

2024-03-23T17:55:25.72+00:00

Hi @Steven Stermer, silly question but have you restarted the function app itself? Were there any errors prior to the Job Host Stopped?
Steven Stermer 0 Reputation points

2024-03-23T18:37:20.0766667+00:00

Hey thanks for the response. I just checked, and after a 3 day outage, it appears to be logging again.

To originally debug, I did reset the function. I also tried redeploying the same code to the function app again and it still wasn't working as intended.

A day or two before the failure there was a release, but it logged correctly for at least a couple of days before the issue.

There was no error prior to Job Host Stopped - just the typical Stopping the listener messages of handlers disconnecting as it is a consumption based function.
Ryan Hill 30,281 Reputation points Microsoft Employee Moderator

2024-03-25T21:20:36.3133333+00:00

Glad to hear the issue is resolved but curious to know what happened to begin with. Just to confirm, you only had one affected function? Or were multiple functions affected? If so, same region or separate regions?
Steven Stermer 0 Reputation points

2024-03-26T00:44:57.7233333+00:00

Thanks for investigating this. You are correct in that there was only 1 affected function. The other 2 logged correctly during this time. They are all in the same region, East US.

Each function is under a different resource group.

Your answer

Ryan Hill 30,281 Reputation points Microsoft Employee Moderator

2024-03-23T17:55:25.72+00:00

Hi @Steven Stermer, silly question but have you restarted the function app itself? Were there any errors prior to the Job Host Stopped?
Steven Stermer 0 Reputation points

2024-03-23T18:37:20.0766667+00:00

Hey thanks for the response. I just checked, and after a 3 day outage, it appears to be logging again.

To originally debug, I did reset the function. I also tried redeploying the same code to the function app again and it still wasn't working as intended.

A day or two before the failure there was a release, but it logged correctly for at least a couple of days before the issue.

There was no error prior to Job Host Stopped - just the typical Stopping the listener messages of handlers disconnecting as it is a consumption based function.
Ryan Hill 30,281 Reputation points Microsoft Employee Moderator

2024-03-25T21:20:36.3133333+00:00

Glad to hear the issue is resolved but curious to know what happened to begin with. Just to confirm, you only had one affected function? Or were multiple functions affected? If so, same region or separate regions?
Steven Stermer 0 Reputation points

2024-03-26T00:44:57.7233333+00:00

Thanks for investigating this. You are correct in that there was only 1 affected function. The other 2 logged correctly during this time. They are all in the same region, East US.

Each function is under a different resource group.

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Function App not logging to Log Analytics workspace defined in Diagnostic Settings

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