Final Update: Wednesday, 14 July 2021 03:24 UTC
We've confirmed that all systems are back to normal with no customer impact as of 07/14, 03:10 UTC. Our logs show the incident started on 07/13, 23:30 UTC and that during the 3 hours and 40 minutes that it took to resolve the issue subset of customers using Azure Log Analytics in West US 2 Region experienced issues with intermittent Log Data Latency and Incorrect Alert Activation .
- Root Cause: The failure was due to issues with unhealthy nodes in the backend services.
- Incident Timeline: 3 Hours & 40 minutes - 07/13, 23:30 UTC through 07/14, 03:10 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
-Jayadev