man: explain what kind of data is actually included in "systemd-analyze plot" output

Prompted by: https://lists.freedesktop.org/archives/systemd-devel/2023-January/048736.html
This commit is contained in:
Lennart Poettering 2023-01-11 13:52:12 +01:00 committed by Zbigniew Jędrzejewski-Szmek
parent e069c57f06
commit c96ec6308c

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@ -284,6 +284,13 @@ Timestamp units-load-finish: Thu 2019-03-14 23:28:07 CET
$ eog bootup.svg&
</programlisting>
</example>
<para>Note that this plot is based on the most recent per-unit timing data of loaded units. This means
that if a unit gets started, then stopped and then started again the information shown will cover the
most recent start cycle, not the first one. Thus it's recommended to consult this information only
shortly after boot, so that this distinction doesn't matter. Moreover, units that are not referenced by
any other unit through a dependency might be unloaded by the service manager once they terminate (and
did not fail). Such units will not show up in the plot.</para>
</refsect2>
<refsect2>