Azure Function Timer Trigger never Fires

Question

I have a python function in Azure that runs every ten minutes. Different from these similar issues that I've been looking at, or this post from Azure, my function doesn't matter what time zone it is synced to, but it never runs at all.

I assume that in the last thierty days it would have run. If there was an issue with my code , it would have errored. It hasn't done anything in a month. If it had run, but errored then there would be logs to look at but there aren't.

{
  "scriptFile": "__init__.py",
  "bindings": [
    {
      "name": "mytimer",
      "type": "timerTrigger",
      "direction": "in",
      "RunOnStartup":true,
      "schedule": "0 */10 * * * *"
    }
  ]
}

The function should run at least once but doesn't. The function runs fine when run locally, and deploys to Az from Visual Studio Code.

The Function is set to "Always on".

What else could I possible check? Note that the functions did run before my recent update, which led me to believe that there might be something with the code, but it isn't that the code is crashing, it's that it's never executing.

You can see that it's configured to run per the docs:

Here are my environ settings:

[
    {
      "name": "AzureWebJobsStorage",
      "value": "DefaultEndpointsProtocol=https;AccountName=exodestinyblob;AccountKey=1234EndpointSuffix=core.windows.net",
      "slotSetting": false
    },
    {
      "name": "BUILD_FLAGS",
      "value": "UseExpressBuild",
      "slotSetting": false
    },
    {
      "name": "ENABLE_ORYX_BUILD",
      "value": "true",
      "slotSetting": false
    },
    {
      "name": "FUNCTIONS_EXTENSION_VERSION",
      "value": "~4",
      "slotSetting": false
    },
    {
      "name": "FUNCTIONS_WORKER_RUNTIME",
      "value": "python",
      "slotSetting": false
    },
    {
      "name": "SCM_DO_BUILD_DURING_DEPLOYMENT",
      "value": "1",
      "slotSetting": false
    },
    {
      "name": "WEBSITE_CONTENTAZUREFILECONNECTIONSTRING",
      "value": "DefaultEndpointsProtocol=https;AccountName=exodestinyblob;AccountKey=1234;EndpointSuffix=core.windows.net",
      "slotSetting": false
    },
    {
      "name": "WEBSITE_CONTENTSHARE",
      "value": "exo-1234",
      "slotSetting": false
    },
    {
      "name": "WEBSITE_HEALTHCHECK_MAXPINGFAILURES",
      "value": "10",
      "slotSetting": false
    },
    {
      "name": "XDG_CACHE_HOME",
      "value": "/tmp/.cache",
      "slotSetting": false
    }
  ]

Answer 1

It is not advised to use runOnStartup as true. When run on these setting code execution is unpredictable. As mention in the Microsoft document, for refernce check this document
few snippets from the document as shown below:

Reproduced timer trigger in my environment "timetest" which runs every 10 minute which prints "Hello World".

Tried in both settings with "runOnStartup as true" and without. It is working fine both locally and on Azure both as shown below: Locally:

Without "RunOnStartup":

With "RunOnStartup":

As you can see below with "runOnStartup" as "true" running on unpredictable time even though it is set to run on every 10 minutes. 2nd time It ran after 4 minutes. 3rd time after 2 minutes.

If you are still facing the issue, I would Suggest please reach out to Azure Support for further assistance.