I am trying to debug an cluster communicaiton failed in my domain betwen Weblogic and Webcenter Content and an useful fonctionality for WLSDM can be as an important tool for it.
I have SystemCpuLoad rise up to 100% and make node failed. So with WLSDL, there is a tool (in green) which can suggest a "possible root cause".

But I need a license to use it.
So I'm doing step to obtain free license and processing all of best functionality of WLSDM,

You can analyze high CPU consumers and backend events in the "possible root cause page"/ "thread analyze page". This page gives you important tips for errors/hogger/stuck threads.

You need to have a valid license to monitor these pages.