These are some dummy scripts to find which gems that GitLab is using, are missing from Fedora repositories.
On a Fedora machine, clone the repository, cd into it and run:
sudo yum install python2 python-bugzilla python-pkgwat-api
chmod +x run.sh
./run.sh
Note that it could take some time because it queries both Fedora's repos and rubygems.org.
Gitlab runtime gems : 145
Gems in Fedora repos : 386
Common gems : 69
To be packaged : 76
Pending review in BZ : 11
When BZ go in repos : 65