We've confirmed that all systems are back to normal with no customer impact as of 02/16, 21:30 UTC. Our logs show the incident started on 02/16, 20:17 UTC and that during the 1 hour and 13 minutes that it took to resolve the issue customers experienced in the West US 2 Region with workspace-enabled Application Insights resources experienced intermittent data gaps as well as possible misfiring of alerts based on resulting data gaps or latencies.
Root Cause: The failure was due to an ingestion backend resource that was in a bad state due to cached data.
Incident Timeline: 1 Hours & 13 minutes - 02/16, 20:17 UTC through 02/16, 21:30 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Initial Update: Tuesday, 16 February 2021 21:22 UTC
We are aware of issues within Application Insights and are actively investigating. Some customers in West US 2 may experience delayed or missed Log Search Alerts and Data Gaps.
Work Around: None
Next Update: Before 02/16 22:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Jeff