This unit is provided by:
Options
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    [Service]- 
        ExecStart=journalctl --flush
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        ExecStop=journalctl --smart-relinquish-var
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        RemainAfterExit=yes
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        TimeoutSec=90s
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        Type=oneshot
 
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    [Unit]- 
        After=systemd-journald.service systemd-remount-fs.service
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        Before=systemd-tmpfiles-setup.service
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        ConditionPathExists=!/etc/initrd-release
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        DefaultDependencies=no
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        Description=Flush Journal to Persistent Storage
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        Documentation=man:systemd-journald.service(8) man:journald.conf(5)
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        RequiresMountsFor=/var/log/journal
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        Wants=systemd-journald.service
 
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Additionnal notes
Nothing here.