We've confirmed that all systems are back to normal as of 03/17 21:21 UTC. Our logs show the incident started on 03/17 20:07 UTC and that during the timeline that it took to resolve the issue 10% of active customers in the East US region experienced data access issues and missed alerts.
Root Cause: The failure was due to stability issues in one of our backend systems.
Incident Timeline: 03/17 20:07 UTC through 03/17 21:21 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.