We are on V8 and use the Cockpit to monitor blocked process flows and Agent availability. There is an associated Time Event that acquires the needed information and populates a Variable.
I am not aware of anything specifically provided by Automic, i.e. pre-canned, to perform any type of monitoring beyond the documented examples for the Cockpit object.
We don't specifically monitor for disk space since we have other non-UC4 process that do that and send alerts. However, since there are Script functions, such as GET_FILESYSTEM, this could be easily added. Just remember that the Cockpit displays the numerical contents of the Variable.