Do you use Endpoint monitoring for your Azure web apps? On April 4, 2016, we’re replacing them with the new and more powerful Availability tests. We already created your new tests. However, please note they will be disabled until we switch over on April 4, 2016.
You can edit the new tests and do the switch yourself if you want. In particular, you should check the notification email address because we’ve set it to the subscription owner. You'll find the tests in the Azure portal in the Default-ApplicationInsights-CentralUS resource group.
Learn more about this switch in the Azure documentation.