Create Alert Rules for Performance, Availability and Failures of Azure Function Application

Question

I would like to setup alerts whenever the function app is down, when there are unusual behavior in error logging and when my function app is in slow performance. For the alerts in my Function app is down, I used availability metrics and its working fine but it took time to notify the users. Which metrics I can refer with to meet those scenarios? I am aware also with custom log search signal type in creating alert rule but no luck in defining specific query to meet the scenarios.

Answer 1

Hi @user20201 ,

Thanks for reaching out to Q&A.

As you mentioned, the custom log search can be used. However there are other metrics that can be leveraged.

Http server errors metric can be used to alert the 5xx errors, so availability and server errors will be alerted.

Response time metric can be used to alert the performance issues and requests in application queue can be used to alert throttling issues

Hope this helps! Feel free to reach out to me if you have any queries or concerns.