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There is no documentation of the configuration options other than in the config directories.

in particular the option AUTOEXCLUDE_MULTIPATH which was suggested in a ticket to a customer is not documented in any Red Hat documentation.

I would like to have all the options fully documented.

AUTOEXCLUDE_MULTIPATH is documented in the user guide, https://github.com/rear/rear/blob/master/doc/user-guide/06-layout-configuration.adoc
One problem is, the user guide is not included in the installed package. This is a problem with the Fedora package as well. I filed a pull request for Fedora, https://src.fedoraproject.org/rpms/rear/pull-request/1 and will look at getting it into the RHEL package.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3293