GitHub added a warning to the display of commits not belonging to any branch on a repository. It's a workaround for how they add commits from pull requests to the repository where they're being proposed. Makes sense but not a solution for this.
However... they forgot about tags.
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So, you get a concerning warning for a commit that is referenced via a tag but not a branch. This is normal. For example, when we tag our stable releases, we need to tag a manifest referring to the other repositories. It's part of the tagged release and is an immutable object.
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There's no reason for us to push a branch with the manifest containing the revisions of all the other repositories. It would require creating a branch for every tagged release. The newest commit is always specific to the tagged release. Oh well, now there are annoying warnings...
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