The online info seems a bit terse. If you don't mind reading the case documentation, this link brings you to the email describing the first amendment to the project. The initial project notes are not open to the public.
Look under the Debugging link for the project on opensolaris.org. Although you rarely get in-depth discussion on relatively obscure projects, there might be some notes on the meaning of the kstats. If not, pretty much you hope the source code has some useful comments.