We've confirmed that all systems are back to normal with no customer impact as of 5/17, 21:26 UTC. Our logs show the incident started on 5/16, 21:53 UTC and that during the 23 hours 27 minutes that it took to resolve the issue 3% of customers ingesting data with non-retrying SDK's in USGov Virginia region might have experienced data loss.
Root Cause: The failure was identified due to a stuck node that needed restart.
Incident Timeline: 23 Hours & 27 minutes - 5/16, 21:53 UTC through 5/17, 21:26 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.