We have confirmed the issue is resolved on all affected instances.
A fix has been applied to all affected Global Monitoring Points. We are seeing Experience Monitoring test results stabilizing, and will continue to monitor.
We have identified the root cause of the issue and are working on a patch.
We are aware of a defect introduced by this evenings release; Experience Monitoring (formerly AppView) tests from a subset of Global Monitoring Points are failing. We are actively investigating, and will provided updates as the become available.