Final Update: Tuesday, 21 September 2021 09:45 UTC We've confirmed that all systems are back to normal with no customer impact as of 09/21, 09:00 UTC. Our logs show the incident started on 09/21, 06:35 UTC and that during the 2 hours & 25 minutes that it took to resolve the issue some customers may have experienced data gaps, data latency, missed/ delayed alerts.
Root Cause: The failure was due to an issue with authentication service.
Incident Timeline: 2 Hours & 25 minutes - 09/21, 06:35 UTC through 09/21, 09:00 UTC
We understand that customers rely on Azure Monitor as a critical service and apologize for any impact this incident caused.