Final Update: Thursday, 04 February 2021 21:02 UTC
We've confirmed that all systems are back to normal with no customer impact as of 02/04, 19:38 UTC. Our logs show the incident started on 02/04, 19:18 UTC and that during the 20 minutes that it took to resolve the issue some customers ingesting telemetry in West Europe region may have experienced intermittent data latency, data gaps and incorrect alert activation.
Root Cause: The failure was due to issues with one of the backend services.
Incident Timeline: 20 minutes - 02/04, 19:18 UTC through 02/04, 19:38 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.