Comment # 3 on bug 1142761 from Stephan Kulow

https://build.opensuse.org/package/show/openSUSE:Tools/osc-plugins-gnome was
last touched 5 years ago and the actively maintained part lives in
osc-plugin-collab.

So uninstalling it is the best you can do. It also fails to build on all of
code15. So I don't think it has an active maintainer