Is there a way to get the disk usage of a particular appliance via REST API? Also to get the processing and rate of each appliance.?
I've moved this thread to the RSA NetWitness Platform community so that you can get an answer to your question.
It depends on the service, but you can simply connect via a browser to the REST port and navigate around until you find the stats you need. For instance, a Decoder will show disk usage and other useful stats here:
Rui Ataide from RSA created a script that can do this for you. You can find out more about it here. Modify it for your exact needs.
SA REST Stats Collection nwstatusreport.py
Retrieving data ...