Using Reading/Web/Sunsetting a project and Phabricator/Project management: Archiving a project as guides.
- Mark the Skin:Blueprint as unmaintained
- Phabricator
- Gerrit
- Abandon open patchsets on Gerrit:
- Archive on Gerrit
- Replicas on Github & Phabricator too
- Drop from CI
The skin was never deployed so no extra step of removing from cluster.