I'm looking for a solution to monitor Active Diretory servers. I've found the post with the DCDiag tool, http://www.squidworks.net/2012/11/kaseya-agent-procedure-free-active-directory-health-monitor-script/ but I am looking for something that is more realtime.

What services should be monitored?

Are there particular functions, such as number of login requests in a given time, that should be watched? If so, what are best practice thresholds to place on these?

Thank you in advance for any help!