There is no specific SPLUNK plugin/extended solution per say, but there are a couple of different ways you can send data to SPLUNK.. primarily via a Database Summary but there are potentially other methods depending on the volume of data and frequency it needs to be pushed.
You would absolutely want to do it from the Managing Node and not directly from the Monitoring Node; in this case the Nonstop.
If can be more specific about what you are passing onto Splunk (filtered or not) and the version of Prognosis you are on we might be able to provide some more guidance. Contacting your Account Manager can put you in more direct contact with services to work out in detial.
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Christopher R Souser - Payments and Infrastructure Consultant – MSci. PA, CISSP, ITIL.