After working for many days on this case with a netapp supporter, we could not find an "easy" way to identify these uids but i was presented with a workaround.
This involves a tcpdump on a node and filtering through the tracefile with wireshark.
Not really what i was looking for but this works for now and the supporter even created a feature request from our findings.
We'll see how that comes out...
I would say that they care at netapp, but it involves work on both sides.