We've confirmed that all systems are back to normal with no customer impact as of 07/27, 09:45 UTC. Our logs show the incident started on 07/27, 08:00 UTC and that during the 1 hour 45 minutes that it took to resolve the issue some of customers experienced data access issues.
Root Cause: The failure was due to issues with one of our backend services which went in to unhealthy state.
Incident Timeline: 1 Hour & 45 minutes - 07/27, 08:00 UTC through 07/27, 09:45 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Saturday, 27 July 2019 10:03 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers may experience issue using Log Analytics in West Europe region.
Work Around: None.
Next Update: Before 07/27 11:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Naresh