Customer Self-Service Portal

How to display the "Performance" metric in the Site24x7 home "Monitor Status" page?

I'm looking to display the Performance data on the Site24x7 home page, like it does for non-plugin monitors. Non-plugin monitors will show things like disk space utilization, network I/O, CPU usage etc. I've included the following picture for a clearer idea of what I'm looking at:

 

Some things, like the mailbox monitor, return only one unit: a number. The Group Check monitor I have returns multiple units of numbers. I'd like to apply the same logic the non-plugin monitors show, as server monitors have more than one unit (CPU, disk, network, etc) and the website chooses which to display dynamically (I'm guessing whatever is highest). How do I do this with my plugin monitors?