This setting was removed in systemd v205 as a part of the control group
rework. Improving documentation of what it did in v204 is likely not
worth the effort.
My guess is that it did not have effects like "result in all descendants
of the main service daemon to be killed", but only mattered if you
Package: systemd
Version: 204-5
Severity: minor
systemd.exec(5) says this:
ControlGroupPersistent=
Takes a boolean argument. If true, the control groups created for
this unit will be marked to be persistent, i.e. systemd will not
remove them when stopping t
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