Final Update: Friday, 25 October 2019 12:05 UTC
We've confirmed that all systems are back to normal with no customer impact as of 10/25, 11:20 UTC. Our logs show the incident started on 10/25, 03:35 UTC and that during the 7 hours and 45 minutes that it took to resolve the issue Customers experienced alerting failure from Log Analytics Metric alerts in East US region.
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Root Cause: The failure was due to issue with our backend service.
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Incident Timeline: 7 Hours & 45 minutes - 10/25, 03:35 UTC through 10/25, 11:20 UTC
We understand that customers rely on Metric Alerts as a critical service and apologize for any impact this incident caused.
-Rama