The scheduler allows to define when a process should run. It can be either
a timestamp in RFC3339 format or a crontab expression. If a scheduler is
given, reconnect and the reconnect delay will only apply to processes that
exited as failed.
The timeout allows to define when a process should be gracefully stopped.
It is measured from the actual start of that process including all reconnects
due to failures. If the process finished regularly, the timeout will be
reset.
If a process has some cleanup with purge-on-delete defined, the purge
has to wait until the process actually exited. Otherwise it may happen
that the process got the signal, files are purged, but the process is
still writing some files in order to exit cleanly. This would lead to
some artefacts left on the filesystem.
