We've confirmed that all systems are back to normal with no customer impact as of 5/21, 13:15 UTC. Our logs show the incident started on 5/21, 12:15 UTC and that during the 1 hour that it took to resolve the issue some of customers may have experienced Delayed or Missed smart alerts issues in multiple regions.
Root Cause: The failure was due to an issue in one of our dependent services.
Incident Timeline: 1 Hour - 5/21, 12:15 UTC through 5/21, 13:15 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Initial Update: Thursday, 21 May 2020 13:47 UTC
We are aware of issues within Application Insights and are actively investigating. Some customers may experience Delayed or missed smart alerts issues in multiple regions.
Work Around: None.
Next Update: Before 05/21 16:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Madhuri