We've confirmed that all systems are back to normal with no customer impact as of 05/30, 06:11 UTC. Our logs show the incident started on 05/28, 21:20 UTC and that during the 2 hours 10 minutes that it took to resolve the issue ~3% of subscriptions got impacted and experienced data gaps in availability results.
Root Cause: The failure was due to issue in one of our backend services.
Incident Timeline: 2 Hours & 10 minutes - 05/28, 21:20 UTC through 05/28, 23:30 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.