/usr/share/menu/xmonad is in xmonad 0.12-5+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | ?package(xmonad):needs="wm" \
section="Window Managers" \
title="Xmonad" \
command="/usr/bin/xmonad"
|