This file is indexed.

/usr/lib/tmpfiles.d/tmp.conf is in systemd 237-3ubuntu10.

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

The actual contents of the file can be viewed below.

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#  This file is part of systemd.
#
#  systemd is free software; you can redistribute it and/or modify it
#  under the terms of the GNU Lesser General Public License as published by
#  the Free Software Foundation; either version 2.1 of the License, or
#  (at your option) any later version.

# See tmpfiles.d(5) for details

# Clear tmp directories separately, to make them easier to override
D /tmp 1777 root root -
#q /var/tmp 1777 root root 30d

# Exclude namespace mountpoints created with PrivateTmp=yes
x /tmp/systemd-private-%b-*
X /tmp/systemd-private-%b-*/tmp
x /var/tmp/systemd-private-%b-*
X /var/tmp/systemd-private-%b-*/tmp

# Remove top-level private temporary directories on each boot
R! /tmp/systemd-private-*
R! /var/tmp/systemd-private-*