(This question may betray a complete failure to
comprehend our caching
structure, but...)
This information is taken from data served by the squids... don't
logged-in users mostly bypass the squid servers in some way or
another, or is that only when actively editing?
As I understand it, they don't technically bypass the squids, but the
squids pass their requests straight through to the main servers rather
than returning cached pages. The squids should be able to gather stats
on logged in users.