The best way to do this is to use feature value. With feature value you could send in any metric from the client you want, in your case CPU usage and thread count. You could also choose only to do this during the processes in the application that you care about, ones that potentially causes heavy load on the client system. Just bear in mind that you shouldn't send it in too often since this could cause extra load on the client system. I will suggest that you do it during selected periods or perhaps calculate average, min and max and send this in with longer intervals.
EQATEC Application Analytics is now Telerik Analytics
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