We've confirmed that all systems are back to normal with no customer impact to query data as of 10/26, 12:10 UTC to 17:50 UTC. Our logs show the incident started on 10/26, 12:10 UTC and that during the 5 hours and 10 mins that it took to resolve the issue 3% of customers experienced Data access issues or delayed/missed Log Search alerts for resources hosted in PRODWUS2.
Root Cause: The failure was due to instances of a backend service became unhealthy
Incident Timeline: 10/26,12:10 UTC through 17:50 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.