We've confirmed that all systems are back to normal with no customer impact as of 4/8, 16:40 UTC. Our logs show the incident started on 4/8, 14:30 UTC and that during the 2 hours that it took to resolve the issue a very small number of requests failed on the Failure and Log Search blades (approximately .02% of requests).
Root Cause: The failure was due to a configuration error in a back-end service.
Incident Timeline: 2 Hours & 10 minutes - 4/8, 14:30 UTC through 4/8, 16:40 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Initial Update: Monday, 08 April 2019 17:46 UTC
We are aware of issues within Application Insights and are actively investigating. Some customers may see error retrieving data in Application Insights Failure and Log Search blades. This seems to only affect applications in the East US region at this point.
Work Around: none at this time
Next Update: Before 04/08 20:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Jack Cantwell