Yeah, possibly. I think that it could be tricky though to get that at a global level in a cheap way. It makes also little sense to only show the temp namespace OID if that information is not enough.
We could I guess add a field specifically for temp_namespace_xid or such. The question is if it's worth the overhead to do that.
Just having the namespace oid is at least enough to know that there is potentially something to go look at it. But it doesn't make for automated monitoring very well, at least not in systems that have a larger number of databases.
You can get the namespace oid today with a JOIN, the issue is that this isn't enough information to go an look at - at the end of the day it's useless unless you can remove the temp table or terminate the session which owns it.
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