We've confirmed that all systems are back to normal with no customer impact as of 8/6, 13:00 UTC. Our logs show the incident started on 8/06, 10:00 UTC and that during the 3 hours that it took to resolve the issue customers could have experienced a delay in alerting.
Root Cause: The failure was due to some backend dependencies.
Incident Timeline:3 Hours - 8/06, 10:00 UTC through 8/06, 13:00 UTC
We understand that customers rely on Azure Monitor as a critical service and apologize for any impact this incident caused.