First published on MSDN on Apr 24, 2018
Between 04/24, 11:00 UTC till 04/24/2018, 16:30 UTC, a small number of customers may have experienced failures in Availability Web Test results executing from these regions : East US, North Central US, Brazil South, South Central US & West US. We root caused this to a backend resource utilization problem which has now been mitigated and all systems are back to normal from 04/24/2018 16:30 UTC.
-Deepesh