Final Update: Tuesday, 22 January 2019 19:10 UTC
We've confirmed that all systems are back to normal with no customer impact as of 01/22, 19:00 UTC. Our logs show the incident started on 01/22, 17:30 UTC and that during the 1 hour 30 min that it took to resolve the issue some customers might have experienced Data access and Latency issues in portal(Azure and OMS) for East US region.
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Root Cause: The failure was due to an issue with dependent service.
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Incident Timeline: 1 Hour & 30 minutes - 01/22, 17:30 UTC through 01/22, 19:00 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
-Venkat