We've confirmed that all systems are back to normal with no customer impact as of 06/27, 05:30 UTC. Our logs show the incident started on 06/26, 16:00 UTC and that during the 13 and a half hours that it took to resolve the issue some customers have stopped receiving alert emails..
Root Cause: The failure was due to recent change in our email template.
Incident Timeline: 13 Hours & 30 minutes - 06/26, 16:00 UTC through 06/27, 05:30 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Wednesday, 27 June 2018 05:17 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers would have stopped receiving alert emails.
Work Around: Customers can directly check the alert status on the OMS Portal. Other actions like webhook/runbook/ITSM are not impacted, only the alert emails are impacted.
Next Update: Before 06/27 07:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience.