Final Update: Saturday, 28 September 2019 02:19 UTC
We've confirmed that all systems are back to normal with no customer impact as of 09/28, 01:50 UTC.Our logs show the incident started on 09/27,04:00 UTC and that during the 21 hours and 50 minutes that it took to resolve the issue a subset of customers in North Europe region using Log Analytics may have experienced issues with metric alerts not being delivered or may have received false positive alerts.
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Root Cause: The failure was due to increase on load on the dependent service.
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Incident Timeline: 21 Hours & 50 minutes - 09/27, 04:00 UTC through 09/28, 01:50 UTC
We understand that customers rely on Metric Alerts as a critical service and apologize for any impact this incident caused.
-Jayadev