We've confirmed that all systems are back to normal with no customer impact as of 11/01, 23:36 UTC. Our logs show the incident started on 11/01, 20:15 UTC and that during the 3 hours 20 minutes that it took to resolve the issue 25.6% of customers experienced data access issues in West Central US for Log Analytics..
Root Cause: The failure was due to a cache connection failure, which resulted in internal denial of service event.
Incident Timeline: 3 Hours & 20 minutes - 11/01, 20:15 UTC through 11/01, 23:36 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Friday, 01 November 2019 23:01 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers may experience data access issues in West Central US for Log Analytics.
Work Around: None
Next Update: Before 11/02 01:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Sindhu