Final Update: Thursday, 25 February 2021 09:21 UTC
We've confirmed that all systems are back to normal with no customer impact as of 02/25, 08:55 UTC. Our logs show the incident started on 02/25, 07:24 UTC and that during the 1 Hours & 31 minutes that it took to resolve the issue some customers may have experienced data latency and incorrect alert activation in West Europe region.
Root Cause: The failure was due to issue with one of our backend service which became unhealthy during the impacted window.
Incident Timeline: 1 Hours & 31 minutes - 02/25, 07:24 UTC through 02/25, 08:55 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Update: Thursday, 25 February 2021 08:32 UTC
Root cause has been isolated to one of the backend dependency is down. To address this, engineers are currently working. Some customers may experience data latency and incorrect alert activation in West Europe region.