Once you select your object of interest (cluster, virtual data center et al) you can select the "Reports" tab. Within that tab you will see a report templates and Generate Reports button as well...
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Once you select your object of interest (cluster, virtual data center et al) you can select the "Reports" tab. Within that tab you will see a report templates and Generate Reports button as well as actions designated with icons (New Template etc). Below that you should see a list of pre create report names including oversized and stressed vm reports. If you highlight the report then select the Run template icon, the completed report should show up in the generated reports area. Once the report is complete you can then open as a pdf or csv. It is also possible to create a custom report that could show both oversized and stressed in the same report but I have not had the chance to try that yet. Hope I did not over state the obvious!