Final Update: Saturday, 19 January 2019 07:30 UTC
We've confirmed that all systems are back to normal with no customer impact as of 01/19, 07:30 UTC. Our logs show the incident started on 01/19, 05:45 UTC and that during the 1 hour 45 minutes hours that it took to resolve the issue 5% of customers using API keys experienced query failures.
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Root Cause: The failure was due to the issue with one of backend system.
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Incident Timeline: 1 Hours & 45 minutes - 01/19, 05:45 UTC through 01/19, 07:30 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
-Monish