Hey,
Since not all of us can afford computers with IPMI, a while back there was some interest in using Linux's lm_sensors as the source of diagnostics for the computer_monitor node (currently in the pr2 stacks).
I have put together a parser for using lm_sensors data in the pr2_computer_monitor package, as well as updating the nvidia-smi parser to use the new XML format.
Code is available in my personal stack, pending deciding what to do with it:
Attached is an example of the sensors node running on my local machine and outputting to /diagnostics.
~mc
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Michael Carroll