Final Update: Wednesday, 18 July 2018 19:27 UTC
We've confirmed that all systems are back to normal with no customer impact in the West US region as of 07/18, 19:28 UTC.
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Root Cause: The failure was due to scaling issues on our server side.
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Lessons Learned: We are adding more monitoring to the detect scaling issues.
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Incident Timeline: 07/16, 00:00 UTC through 07/18, 19:28 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
-Application Insights