Resource Health alert for front door is raised frequently for expiring custom domains

Camilo Terevinto 0 Reputation points
2025-02-10T09:04:30.65+00:00

I have an Activity Log Alert Rule configured as follows:

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I have a custom domain with our own certificate that will expire in 29 days. Yesterday, I got almost 40 alerts for the expiration, and it's like this:

  1. Critical alert ("custom domain certificate expires soon"), and it goes from Available to Unavailable.
  2. 30-60 minutes later, I get an Informational alert with a transition from Unavaiable to Available.
  3. 30-60 minutes later, the critical alert is repeated

Is there anything wrong in my setup? Why am I getting "available" alerts when I have not updated the certificate?

Azure Monitor
Azure Monitor
An Azure service that is used to collect, analyze, and act on telemetry data from Azure and on-premises environments.
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Azure Front Door
Azure Front Door
An Azure service that provides a cloud content delivery network with threat protection.
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