We've confirmed that all systems are back to normal with no customer impact as of 3/19, 05:10 UTC. Our logs show the incident started on 3/19, 04:30 UTC and that during the 40 minutes that it took to resolve the issue some of the customers may have experienced intermittent data latency, data access and missed or delayed alerts in East US region.
Root Cause: The failure was due to a backend dependency.
Incident Timeline: 40 Minutes - 19/3, 04:30 UTC through 19/3, 05:10 UTC
We understand that customers rely on Application insights as a critical service and apologize for any impact this incident caused.