This file is indexed.

/etc/apparmor.d/tunables/ntpd is in ntp 1:4.2.6.p3+dfsg-1ubuntu3.

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

The actual contents of the file can be viewed below.

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# vim:syntax=apparmor
# ------------------------------------------------------------------
#
#    Copyright (C) 2002-2005 Novell/SUSE
#    Copyright (C) 2011 Canonical, Ltd.
#
#    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.
#
# ------------------------------------------------------------------

#Add your ntpd devices here eg. if you have a DCF clock
# @{NTPD_DEVICE}="/dev/ttyS1"
@{NTPD_DEVICE}="/dev/null"