This file is indexed.

/etc/news/localgroups is in inn2 2.5.2+20110413-1build1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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##  $Id: localgroups 8441 2009-05-03 22:12:50Z iulius $
##
##  Put your local newsgroups, along with their descriptions,
##  in this file (formatted like the newsgroups file) if you want
##  them to be recognized by docheckgroups.  They would otherwise
##  be mentioned for removal.
##
##  There is no need to put here local newsgroups of hierarchies
##  for which no checkgroups control messages are sent (unless
##  you manually process checkgroups texts for them).
##
##  Lines beginning with a hash sign (#) are not taken into account.
##
##  See the docheckgroups man page for more information.

#comp.group.to.add	An additional local newsgroup in comp.*.
#comp.other.group	Another local newsgroup in comp.*.