Final Update: Saturday, 25 January 2020 12:53 UTC
We've confirmed that all systems are back to normal with no customer impact as of 01/26, 04:50 UTC. Our logs show the incident started on 01/25, 05:00 UTC and that during the 23 hours and 50 minutes that it took to resolve the issue most of the customers may have experienced issues with missed or delayed Alerts notification for Azure Monitor service.
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Root Cause: The failure was due to one of our internal services impacted due to the SQL DB outage happened in US Govt regions.
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Incident Timeline: 23 Hours & 50 minutes - 01/25, 05:00 UTC through 01/26, 04:50 UTC
We understand that customers rely on Azure Monitor as a critical service and apologize for any impact this incident caused.
-Anmol