Rewrote ./bin/ta_ontap/OntapPerf.py to query system:node instead of system (as held in the objectType parameter), when ontap v8.3+ is detected. Amended OntapClinet.py as well (to manage querying the ontap version). Not a 100% fix, as it appears some of the resulting attributes are different - not a perfect 1:1 match for data structure - but good enough for us.
Small print in the hardware and software requirements for the Splunk app do actually note that only up to 8.2 is supported...
Splunk App developers have been contacted with details of my workaround.
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