We've confirmed that all systems are back to normal with no customer impact as of 06/11, 06:30 UTC. Our logs show the incident started on 06/11, 03:10 UTC and that during the 3 hours 20 minutes that it took to resolve the issue some customers may have experienced issues accessing Log Search Alerts and Log Search queries via the Azure Portal..
Root Cause: The failure was due to performance degradation in one of our backend components.
Incident Timeline: 3 Hours & 20 minutes - 06/11, 03:10 UTC through 06/11, 06:30 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, 11 June 2019 04:29 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers may experience difficulties accessing query logs from Azure portal.
Work Around: None
Next Update: Before 06/11 08:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Mohini Nikam