Determine Correct metrics for Alerts when Azure SQL is down

I believe you can set up an alert on the resource health of server.

Resource health determines the health of your SQL database by examining the success and failure of logins to the resource. Currently, Resource health for your SQL Database resource only examines login failures due to system error and not user error. The health status is updated every 1 to 2 minutes.

Here is a reference document on how to set up an alert on those line azure.microsoft.com/en-us/blog/three-ways-to-get-notified-about-azure-service-issues/

Thank you!