We've confirmed that all systems are back to normal with no customer impact as of 11/11, 02:30 UTC. Our logs show the incident started on 11/11, 01:00 UTC and that during the ninety minutes that it took to resolve the issue some customers experienced log search alert failure or latency in West Europe, North Europe, East US, Brazil South or West Central US.
Root Cause: The failure was due to a scaling issue in a back end service.
Incident Timeline: 1Hour & 30 minutes - 11/11, 01:00 UTC through 11/11, 02:30 UTC
We understand that customers rely on Log Search Alerts as a critical service and apologize for any impact this incident caused.
Initial Update: Monday, 11 November 2019 02:27 UTC
We are aware of issues within Log Analytics and Log Search Alerts and are actively investigating. Some customers may experience data access issues for Log Analytics and latency in Log Search Alerts in East US, West Europe, Brazil South and West Central US.
Next Update: Before 11/11 04:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Sindhu