how to create a chart that will display CPU usage from many nodes?
You can add the "Multiple Object Chart" resource to a view, and let it display "Average CPU load" for nodes you select.
It is possible by using the Custom HTML resource. You would click on the CPU gauge of a node for instance and copy the HTML code of the guage from the web page source code. You could then add another gauge below the one before, or format the box using HTML table tags etc. It is quite a bit of messing around but it might be an option.
