During an upgrade of the F5 web hosted service, 3 of the 4 nodes behind the VIP started returning HTTP 500s after the VIP swap.  Prior to the VIP swap, 12 consecutive tests against the staging slot passed.  The previous deployment was restarted and VIP swapped back in to mitigate.  The team will investigate why this has happened in the F5 hosted service but the same code was successful in 4 other hosted services (including one in the same region/VNet).

Start Date & Time: 07/11/2014 23:44:45 (UTC)
End Date & Time: 07/11/2014 23:50:08 (UTC)

We apologize for the inconvenience this may have caused.

- Application Insights Service Delivery Team