The admission rules are executed within the add_micheline_job function of OAR's IO lib. See https://github.com/oar-team/oar/blob/2.5/sources/core/common-libs/lib/OAR/IO.pm#L1507.
The following perl variables can be used in admission rules:
Unfortunately, this is not a polished API… and the names of the variables may not give obvious hints of what they are for or want they contains.
Please use the Perl Data::Dumper in your trial and erros coding…
Also, see the following pages for examples:
oaradmissionrules -S -f
command