Final Update: Friday, 18 January 2019 15:16 UTC
We've confirmed that all systems are back to normal with no customer impact as of 01/18, 14:30 UTC. Our logs show the incident started on 01/18, 12:30 UTC and that during the 2 hours that it took to resolve the issue most of the customers experienced delay in notification delivery and the status was incorrectly displayed.
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Root Cause: The failure was due to issues in one of our dependent service .
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Incident Timeline: 2Hours - M/D, 01/18, 12:30 UTC through 01/18, 14:30 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
-Monish