Final Update: Wednesday, 27 June 2018 06:10 UTC
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..
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Root Cause: The failure was due to recent change in our email template.
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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.
-Varun