/lib/systemd/system/systemd-journal-upload.service is in systemd-journal-remote 229-4ubuntu4.
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 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | #  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.
[Unit]
Description=Journal Remote Upload Service
Documentation=man:systemd-journal-upload(8)
After=network.target
[Service]
ExecStart=/lib/systemd/systemd-journal-upload \
          --save-state
User=systemd-journal-upload
SupplementaryGroups=systemd-journal
PrivateTmp=yes
PrivateDevices=yes
WatchdogSec=3min
# If there are many split up journal files we need a lot of fds to
# access them all and combine
LimitNOFILE=16384
[Install]
WantedBy=multi-user.target
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