Timer triggered functions not firing

Question

We have a TimeTrigger that sporadically stops running and resolves after a restart. The function generates or renews LetsEncrypt SSL certs. Manually running the function via POST with functionKey runs the function without issue when the time trigger fails to run.

Oddly, the portal says it was invoked & App Analytics shows no exceptions. We can tell it hasn't run because the certs are not created for new customers and our logs are empty.

From https://github.com/Azure/azure-functions-host/wiki/Investigating-and-reporting-issues-with-timer-triggered-functions-not-firing:

1. Function app is running in an App Service Plan with AlwaysOn enabled
2. TimeZone is UTC
3. Sampling is not relevant

Function App:
UTC execution time: 2021-04-28T13:53:04.445
Id: ed88a113-c245-4256-b70b-b3b733a5efa5
Region: Canada East

Please let me know if you need any other information.

Answer 1

Hello @ai , This seems to be application specific and needs dedicated troubleshooting. Hence I would request you to open a support ticket with Microsoft Support if you have a subscription which allows you to do so. Otherwise , you can send an email with subject line “Attn:Jaya” to AzCommunity[at]Microsoft[dot]com referencing this thread along with the subscription id.