Final Update: Friday, 17 January 2020 00:45 UTC
We've confirmed that all systems are back to normal with no customer impact as of 1/17, 00:00 UTC. Our logs show the incident started on 1/16, 23:17 UTC and that during the ~43 mins that it took to resolve the issue customers experienced data access issue while accessing application insights in East US region.
- Root Cause: The failure was due to heavy query load on the backend service.
- Incident Timeline: 43 minutes - 1/16, 23:17 UTC through 1/17, 00:00 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
-Anupama