We've confirmed that all systems are back to normal with no customer impact as of 06/05, 10:50 UTC. Our logs show the incident started on 06/05, 07:45 UTC and that during the ~3 hours that it took to resolve the issue about 10% of the customers in the East US region would have experienced issues while accessing their data in the Azure Portal. Query performance would also have been impacted.
Root Cause: The failure was due to performance degradation in one of our backend components .
Incident Timeline: 3 Hours & 10 minutes - 06/05, 07:45 UTC through 06/05, 10:50 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Wednesday, 05 June 2019 09:01 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers in East US region may experience issues while accessing their data on the Azure Portal.
Work Around: None
Next Update: Before 06/05 12:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience.