Management of our AD environment, is now the responsibility of a 3rd party. We need from an independent assurance point of view, to ensure they have effective management and monitoring operations in place to identify and resolve any issues with AD in a timely manner. I know for example a general server admin would like alerts on free space, CPU usage, memory usage, to alert on any dangerous thresholds reached. But for AD, is there a list anywhere on the types of events/metrics they should be monitoring for, so we can check whether they are or are not doing so? If you use an automated tool for monitoring AD health, it would be useful to know the priority alerts it checks for/alerts on.