Final Update: Thursday, 22 November 2018 16:59 UTC
We've confirmed that all systems are back to normal with no customer impact as of 11/22, 15:50 UTC. Our logs show the incident started on 11/22, 15:10 UTC and that during the 40 min that it took to resolve the issue Approximately 7% of customers in West Europe might have experienced data access issues in Azure Portal for Application Insights.
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Root Cause: The failure was due to issues with one of the dependent service.
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Incident Timeline: 40 minutes - 11/22, 15:10 UTC through 11/22, 15:50 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
-Venkat