osg-release is the yum repository setup required to install OSG software.  
This release includes:
 - Production (named 'osg') (default)
 - Testing
 - Development
 - Minefield (Directly off koji)
 - Pre-Release (Directly off koji)
 - Upcoming
 - Upcoming Testing
 - Upcoming Development
 - Upcoming Minefield (Directly off koji)
 - Upcoming Pre-Release (Directly off koji)
 - Contrib
 - Devops
 - Devops ITB
 - Next (Future release series, possibly not yet existing)
 - Next Testing
 - Next Development
 - Next Minefield (Directly off koji)

The osg-release is designed for both el7 and el8.  It only installs the
appropriate repo files for the platform.

By default, only the Production repo is enabled.  This can be changed by 
editing the yum.repos.d/osg-*.repo files and setting:
enabled=1