rubygem-haml-rails is required to implement Subscription Asset Manager (SAM) functionality.
This package should have really the lowest priority IMO, since this is just development package, by no means necessary for runtime. Not mentioning that this package is not yet in Fedora.
Added as part of the katello packaging effort
Package found in brew: https://brewweb.devel.redhat.com/taginfo?tagID=3408
getting rid of 6.0.0 version since that doesn't exist