/etc/apparmor.d/abstractions/mdns is in apparmor 2.12-4ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | # ------------------------------------------------------------------
#
# Copyright (C) 2002-2006 Novell/SUSE
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License published by the Free Software Foundation.
#
# ------------------------------------------------------------------
# mdnsd
/etc/nss_mdns.conf r,
/{,var/}run/mdnsd w,
|