Second, we've changed the 'protected' portions of git to primarily
focus on refs/tags/rel - thus any tags under rel, will have their
entire commit history. This provides the provenance that the ASF needs
for releases, while still giving projects the ability to mold their
repository in the way they see fit.
Thus when a release vote is successful - part of the release process
should become tagging the voted upon commit SHA under rel/ to make it
indelible. ('# git tag rel/v15.4.2 ' or something similar.)
Make sure our documentation and scripts correctly tell us to make the final tag start with "rel/"