We've confirmed that all systems are back to normal with no customer impact as of 02/04, 01:40 UTC. Our logs show the incident started on 02/03, 21:31 UTC and that during the 4 hours 9 minutes hours that it took to resolve the issue, some customers in West US, WestUS2, East US and South Central US experienced Data Latency, data gaps and incorrect alert activation.
Root Cause: The failure was due to one of the dependent service.
Incident Timeline: 4 Hours & 9 minutes - 02/03, 21:31 UTC through 02/04, 01:40 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Initial Update: Monday, 03 February 2020 23:53 UTC
We are aware of issues within Application Insights and are actively investigating. Some customers in West US 2 and East US may experience Data Latency,data gaps and incorrect alert activation.
Next Update: Before 02/04 04:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Subhash