This file is indexed.

/etc/apparmor.d/tunables/kernelvars 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.

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#    Copyright (C) 2012 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.
#
# ------------------------------------------------------------------

# This file should contain declarations to kernel vars or variables
# that will become kernel vars at some point

# until kernel vars are implemented
# and until the parser supports nested groupings like
#   @{pid}=[1-9]{[0-9]{[0-9]{[0-9]{[0-9]{[0-9],},},},},}
# use
@{pid}={[1-9],[1-9][0-9],[1-9][0-9][0-9],[1-9][0-9][0-9][0-9],[1-9][0-9][0-9][0-9][0-9],[1-9][0-9][0-9][0-9][0-9][0-9],[1-4][0-9][0-9][0-9][0-9][0-9][0-9]}

#same pattern as @{pid} for now
@{tid}=@{pid}

#A pattern for pids that can appear
@{pids}=@{pid}