We've confirmed that all systems are back to normal with no customer impact at present. Our logs show the incident started on 03/13, 17:26 UTC and during the 56 minutes that it took to resolve the issue a subset of customers experienced data loss for metrics data in West Europe. This data was never ingested to our system so they would see gaps in charts in Azure portal for impacted duration.
Root Cause: The failure was due to an issue in our streaming services.
Incident Timeline: 56 minutes - 03/13, 17:26 UTC through 03/13, 18:22 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.