as mentioned you could create a data explorer table result which provides all your hosts and sort them, even export them to excel where you can then use advanced data sets to isolate hosts with a lack of disk space.
At a large insurance company we had a particular team that was responsible for all the resources of the hosts. We, the Dynatrace Team formulated a Custom Event for alerting (Metric Event) to alert if and when a host has less than x% of disk space on the target drive. These problems were then raised and routed to the Resource Team that raised the allocations. This allowed us to streamline the process to alert the actionable team when resources needed to be raised and included static verbiage related to the Dynatrace upgrade coming in the next week.
You can make some pretty cool solution in Dynatrace, sometimes you just need to sit back and look at the problem from out side the box.
We typically activated this custom event 2 weeks prior to our upgrade and turned it off shortly there after
-Chad
