We've confirmed that all systems are back to normal with no customer impact as of 10/06, 21:45 UTC. Our logs show the incident started on 10/06, 18:45 UTC and that during the 3 hours that it took to resolve the issue some of customers experienced in East US may experience intermittent data gap and incorrect metric alert activation.
Root Cause: The failure was due to one of dependent service .
Incident Timeline: 3 Hours & 0 minutes - 10/06, 18:45 UTC through 10/06, 21:45 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Initial Update: Tuesday, 06 October 2020 19:55 UTC
We are aware of issues within Application Insights and are actively investigating. Some customers in East US may experience intermittent data gap and incorrect metric alert activation starting 18:45 UTC.
Work Around: NA
Next Update: Before 10/07 00:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Subhash