First published on MSDN on Jul 18, 2018
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.
  • Root Cause: The failure was due to scaling issues on our server side.
  • Lessons Learned: We are adding more monitoring to the detect scaling issues.
  • 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