Custom WMI Monitors

Custom WMI Monitors

Hi All!
How can i create a custom WMI monitor (site 24x7 plugin right?) to monitor one of the several WMI options that a Windows Server has?, can you give me an example for the average disk queue length of a hard diks?

https://www.site24x7.com/help/admin/adding-a-monitor/plugins/custom-plugins.html

I just cant make it work.

Thanks!