We've confirmed that all systems are back to normal as of 03/17, 19:54 UTC. Our logs show the incident started on 03/17, 19:14 UTC and that during this timeline subset of customers in East US experienced data access issues and possible missed alerts.
Root Cause: The failure was due to backend component that needed to be restarted.
Incident Timeline: 40 minutes - 03/17, 19:14 UTC through 03/17, 19:54 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.