Steps to request space on the mirror network
Same process as for -testing, except that current process is getting notification that pkgs are tagged in -release tag, and so would push to mirror.centos.org network (and so external mirrors) and also sign packages with correct SIG GPG key.
It will also push debuginfo pkgs to debuginfo.centos.org and src.rpm packages to vault.centos.org
Worth noting that for CentOS 7 only, x86_64 will be pushed to mirror.centos.org/centos/$path while other arches like ppc64le/ppc64/aarch64 will be pushed to mirror.centos.org/altarch/$path. The $contentdir yum variable can be used in your .repo files to select the branch (centos or altarch).