If you are a GNOME Maintainer—you have a GNOME account, you are part of the GNOME group, and you are listed in a project’s DOAP file—how do you keep up with what the rest of the project contributors (maintainers, designers, translators, documentation authors, etc) are doing?
Well the criteria is “do you have a GNOME account, you are part of the GNOME group, and you are listed in a project’s DOAP file?” so I’d say maintainers only.
I cannot put everything into the title, can I? That’s why I specified who are the interested parties—people who contribute to GNOME from within the GNOME group on GitLab. Those aren’t just “maintainers” in the strict developer sense: designers and translation team coordinators also have access to the GNOME group on GitLab, for instance.