Final Update: Thursday, 02 September 2021 11:05 UTC
We've confirmed that all systems are back to normal with no customer impact as of 09/02, 10:50 AM UTC. Our logs show the incident started on 09/01, 17:00 UTC and that during the 17 hours 50 minutes that it took to resolve the issue customers globally may have experienced a delay while viewing the alerts list in Azure Portal.
Root Cause: The failure was due to the back end dependency.
Incident Timeline: 17 Hours & 50 minutes - 09/01, 17:00 UTC through 09/02, 10:50 UTC
We understand that customers rely on Azure monitor as a critical service and apologize for any impact this incident caused.