Final Update: Saturday, 23 October 2021 05:19 UTC
We've confirmed that all systems are back to normal with no customer impact as of 10/23, 05:05 UTC. Our logs show the incident started on 10/22, 22:30 UTC and that during the 6 hours & 35 minutes that it took to resolve the issue some customers may have experienced intermittent data latency, partial query result and incorrect alert activation in West US 2 region.
- Root Cause: The failure was due to an issue with dependent service.
- Incident Timeline: 6 Hours & 35 minutes - 10/22, 22:30 UTC through 10/23, 05:05 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
-Vyom
Update: Saturday, 23 October 2021 02:23 UTC
We continue to investigate issues within Log Analytics. Root cause is not fully understood at this time.
Customers ingesting telemetry in their Log Analytics Workspace in West US 2 geographical region during 10/22 starting from 22:30 UTC may have experienced intermittent data latency, partial query result and incorrect alert activation
- Work Around: none
- Next Update: Before 10/23 05:30 UTC
-Varun
