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Final Update: Thursday, 21 February 2019 09:03 UTC

We've confirmed that all systems are back to normal with no customer impact as of 02/21, 05:46 UTC. Our logs show the incident started on 02/20, 09:15 UTC and that during the 20 hours & 31 minutes that it took to resolve the issue customers would have experienced alerting issue where notifications are not received.
  • Root Cause: The failure was due to deployment within Azure Monitor environment.
  • Incident Timeline: 20 Hours & 31 minutes - 02/20, 09:15 UTC through 02/21, 05:46 UTC
We understand that customers rely on Azure Monitor as a critical service and apologize for any impact this incident caused.

-Naresh

Update: Thursday, 21 February 2019 03:34 UTC

We continue to investigate issues within Log Analytics. Root cause is not fully understood at this time. Some customers continue to experience alerting issue where email is not received. 
  • Next Update: Before 02/21 06:00 UTC
-Arvind

Initial Update: Thursday, 21 February 2019 00:29 UTC

We are aware of issues within Log Analytics and are actively investigating. Some customers might not have received alerting emails even though the alert is in active state. We provide more updates as we learn.
  • Next Update: Before 02/21 02:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience.
-Jayadev