We've confirmed that all systems are back to normal with no customer impact as of 02/12, 05:24 UTC. Our logs show the incident started on 02/12, 01:52 UTC and that during the 3 hours & 32 minutes that it took to resolve the issue some customers may have experienced Data Latency, Data Access and delayed or misfired Alerts in West US region.
Root Cause: The failure was due to one of our backend dependent service.
Incident Timeline: 3Hours & 32 minutes - 02/12, 01:52 UTC through 02/12, 05:24 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Initial Update: Friday, 12 February 2021 01:35 UTC
We are aware of issues within Azure Monitor Services and are actively investigating. Some customers in West US Region may experience Data Latency, Data Access and delayed or misfired Alerts.
Next Update: Before 02/12 06:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Jayadev