I have been informed that the reported issue has been addressed in controller version 20.3.0. There is a property which needs to be enabled for the ER to be effective, so in case of a SaaS controller you need to contact Appdynamics Support team. In case of an OnPrem controller instead, here the steps to enable it: 1. Login to <controllerURL>/controller/private/ControllerFlagsServlet 2. Use root@system and controller root password for login 3. Look for the following property and set it to 'true' com.appdynamics.metric.query.metricexpressions.tolerateNull 4. Save it.
... View more