Final Update: Saturday, 04 December 2021 03:11 UTC
We've confirmed that all systems are back to normal with no customer impact as of 12/4, 03:00 UTC. Our logs show the incident started on 12/3, 20:00 UTC and that during this time customers may have experienced delayed or missed Log Search Alerts and Data Latency in East US.
Root Cause: An instance on a dependent backend service became unhealthy, preventing requests from completing.
Incident Timeline: 8 Hours - 12/3, 20:00 UTC through 12/4, 03:00 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Initial Update: Saturday, 04 December 2021 02:30 UTC
We are aware of issues within Application Insights and are actively investigating. Some customers may experience delayed or missed Log Search Alerts and Data Latency in East US.
Work Around: none
Next Update: Before 12/04 05:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Ian