Final Update: Thursday, 10 December 2020 22:29 UTC
We've confirmed that all systems are back to normal with no customer impact as of 12/10, 21:45 UTC. Our logs show the incident started on 12/10, 20:45 UTC and that during the 1 hour that it took to resolve the issue some of customers in East US, EastUS2, South Central US, West Central US, Central Canada, South Africa North experienced data access issues and missed/delayed log search alerts.
Root Cause: The failure was due to a recent deployment in one of the backend services.
Incident Timeline: 1 hour - 12/10, 20:45 UTC through 12/10, 21:45 UTC
We understand that customers rely on Azure monitor as a critical service and apologize for any impact this incident caused.
Initial Update: Thursday, 10 December 2020 21:42 UTC
We are aware of issues within Azure monitor services and are actively investigating. Some customers in multiple regions may experience data access issues, delayed or missed Log Search Alerts.
Work Around: None
Next Update: Before 12/11 00:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Anupama