Hi, I have an Azure function that gets triggered by a timer every 5 minutes. This function stopped firing yesterday morning and then started firing again yesterday afternoon. I've looked in App Insights but see nothing that explains why this would have happened. Can anyone advise on how I can figure out what has happened? Some details: Using consumption plan. Deployed using an Azure pipeline and ARM templates. Using runtime v4 WEBSITE_TIME_ZONE not set. CRON expressions is ("0 */5 * * * *"). We expect this function to fire every 5 minutes. This function should have triggered at 09:00 UTC on 23/04/24 but didn't. I'm determining this by looking at the App Insights log, specifically the requests log using the name of the function: Function app name: IoAzServicesFunctions-biwc3f4obz3n4 Thanks Kevin

Function with timer trigger stopped firing.

Kevin White 0

Hi,

I have an Azure function that gets triggered by a timer every 5 minutes. This function stopped firing yesterday morning and then started firing again yesterday afternoon. I've looked in App Insights but see nothing that explains why this would have happened. Can anyone advise on how I can figure out what has happened?

Some details:

Using consumption plan.
Deployed using an Azure pipeline and ARM templates.
Using runtime v4
WEBSITE_TIME_ZONE not set.
CRON expressions is ("0 */5 * * * *"). We expect this function to fire every 5 minutes.
This function should have triggered at 09:00 UTC on 23/04/24 but didn't. I'm determining this by looking at the App Insights log, specifically the requests log using the name of the function:

Function app name: IoAzServicesFunctions-biwc3f4obz3n4

Thanks

Kevin

JananiRamesh-MSFT 21,471 Reputation points

2024-04-25T07:26:35.23+00:00

@Kevin White Thanks for reaching out. From the description I understand that a function that was expected to fire every 5 minutes but did not trigger for 7 hours.

WEBSITE_CONTENTSHARE and WEBSITE_CONTENTAZUREFILECONNECTIONSTRING must be configured for Windows Consumption. Please configure these two app settings according to File Shares in your Azure Storage Account, because function apps on Windows Consumption require a file system to run.

https://learn.microsoft.com/en-us/azure/azure-functions/functions-app-settings#website_contentazurefileconnectionstring

I verified the backend logs, I don't see any logs/errors for functionapp before April 23rd 15:30. Function started working from 15:30 UTC as shown below

I further analyzed and saw that the function was last executed at 9/4 and then at 23/4 13.30. But as per the application insights logs that you shared shows function executed at 23/4 8.15 this needs further investigation as i don't see these logs at my end.

We might have to look at this resource specifically to troubleshoot this specific issue and our support team has great tools to investigate further. Do you have Support Plan? If so, I would recommend creating one. Otherwise let me know, I can create one time request for you.

do let me know incase of further queries, I would be happy to assist you.
Kevin White 0 Reputation points

2024-04-25T09:29:29.8066667+00:00

@JananiRamesh-MSFT Thanks for getting back to me. I will add the app settings that you mentioned above. Could that be the reason for the problem? We haven't had these in place and the function app has worked without issue for many months.

If not then could you create a one time request for me please?

Thanks for your help.

Kevin
Kevin White 0 Reputation points

2024-04-25T09:31:53.2933333+00:00

@JananiRamesh-MSFT Thanks for your response. I will add the app settings you mentioned above. Could that be the reason for the issues we have experienced? We have had this function app (and another) running for many months without any previous issues. If not then could you raise a one time request for me please?Regards

Kevin
Kevin White 0 Reputation points

2024-04-25T09:52:06.4833333+00:00

@JananiRamesh-MSFT I've looked at adding WEBSITE_CONTENTSHARE, however we deploy using ARM templates and the documentation here https://learn.microsoft.com/en-us/azure/azure-functions/functions-app-settings#WEBSITE_CONTENTSHARE states that:

Not setting WEBSITE_CONTENTSHARE is the recommended approach for an ARM template deployment.

So I don't think we should set it?

Kevin
JananiRamesh-MSFT 21,471 Reputation points

2024-04-25T10:45:43.0633333+00:00

@Kevin White Thanks for getting back, Please email the following to AzCommunity@microsoft.com and we'll get back to you promptly:

• Subject: "Attn: Janani "

• Email body: Your Subscription ID

• Email body: A link to this thread so we can validate and expedite the request