Seonglae ChoGit Notes: git's coolest, most unloved feature - Tyler Cipriani
the short of it is: they're cool for appending notes from automated systems (like ticket or build systems) but not really for having interactive conversations with other developers (at least not yet) - Scott Chacon, GitHub.blog, Aug. 2010 Git notes are almost a secret. They're buried by their own distressing usability.
https://tylercipriani.com/blog/2022/11/19/git-notes-gits-coolest-most-unloved-feature/
The refs/notes/review namespace
refs/notes/review is a special reference that this plugin creates on repositories to store information about code reviews. When a repository is cloned from Gerrit, the refs/notes/review reference is not included by default.
https://gerrit.googlesource.com/plugins/reviewnotes/+/refs/heads/master/src/main/resources/Documentation/refs-notes-review.md