Taylor Blau [off-list ref] writes:

(As an aside, we should consider whether or not the experiment started
in d255105c99 (SubmittingPatches: release-notes entry experiment,
2024-03-25) can yet be declared a success, and if so, graduate it.)

Thanks.  I haven't seen this used very often, though.  Perhaps it
was a failed experiment that needs to be retracted?