Final Update: Wednesday, 14 October 2020 00:02 UTC
We've confirmed that all systems are back to normal with no customer impact as of 10/13, 23:43 UTC. Our logs show the incident started on 10/13, 23:07 UTC and that during the 36 minutes that it took to resolve the issue many customers in the East US region experienced data latency and possible data loss.
Root Cause: The failure was due to a failed upgrade to a backend service and was fixed when the upgrade was rolled back.
Incident Timeline: 37 minutes - 10/13, 23:07 UTC through 10/13, 23:43 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, 13 October 2020 23:27 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers may experience data latency or data loss.
Next Update: Before 10/14 00:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience.