We've confirmed that all systems are back to normal with no customer impact as of 04/20, 15:50 UTC. Our logs show that the incident started on 04/20, 10:00 UTC and that during the 5 hours and 50 minutes that it took to resolve the issue some of the customers experienced intermittent data access issues and delayed or missed Log Search Alerts in West Europe region.
Root Cause: The failure was due to recent deployment that caused backend service to be overloaded.
Incident Timeline: 5 Hours & 50 minutes - 04/20, 10:00 UTC through 04/20, 15:50 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Tuesday, 20 April 2021 15:19 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers may experience data access issue and delayed or missed Log Search Alerts in West Europe region.
Work Around: None
Next Update: Before 04/20 19:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Soumyajeet