Can I build a report that will list all of the Suggested Action Items for the environment by PM Cluster?
If you look in the Inventory view, you can expand the "Physical Machines" section of the Inventory flyout, and then select the PM Cluster that you're interested in. The bottom left panel here shows the list of To Do actions for entities related to this PM Cluster.
If you then click this button (at the top of the Inventory flyout where you selected the PM Cluster), this will generate a PDF or XLSX (your choice) report version of everything you see in the four panels to the right. This includes all of the To Do actions.
Retrieving data ...