In list-units we can see a load column. There's no documentation on what it means and it's possible values. This must be documented in systemctl man page.
See my response on the ML: http://lists.freedesktop.org/archives/systemd-devel/2015-January/026805.html
I think an addition to the man page would be nice, but it has to contain the disclaimer that this list of states is not stable and new states can be added, and old states can be removed.
Fixed by https://github.com/systemd/systemd/pull/8408
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