We've confirmed that all systems are back to normal with no customer impact as of 3/19, 14:36 UTC. Our logs show the incident started on 03/19, 07:00 UTC and that during the 7 hours and 36 minutes that it took to resolve the issue customers of Application Insights might have experienced a delay in data availability, missed or incorrect alerts, or data access API unavailability.
Root Cause: The failure was due to a software flaw in a back-end system. A patch has been rolled out to the affected system and the problem is mitigated.
Incident Timeline: 7 Hours & 36 minutes - 03/19, 07:00 UTC through 03/19, 14:36 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Update: Friday, 19 March 2021 11:17 UTC
Root cause has been isolated to a backend service which was impacting East US, East US2, West Europe and West US2. Some Customers may experience intermittent data access issues and intermittent data latency. Customers may also experience missing or delayed alerts.