There is a pull request[1] for centpkg-sig to change the gitbaseurl from git.centos.org to gitlab.com/CentOS
I have no idea how many CentOS SIG's are using centpkg-sig. And of those that do use it, if you are using git.centos.org or gitlab.com/CentOS.
If your SIG is making rpm's, can you please let me know if you are using centpkg-sig. And if you are, what your gitbaseurl is set to.
Thank You Troy