Andrew's git / gitweb.git / Documentation/config/showbranch.txt
?
Documentation / config / showbranch.txton commit trace2:data: add trace2 instrumentation to index read/write (42fee7a)
   1showBranch.default::
   2        The default set of branches for linkgit:git-show-branch[1].
   3        See linkgit:git-show-branch[1].