$git tag new old 

$git tag -d old 

$git push origin :refs/tags/old 

$git push --tags

Fetch and prune
git fetch --prune
git fetch --tags origin

git diff --name-only release-5.0.0 refs/tags/R5.0.0 --pretty=oneline

tag an old commit
$ git tag -a v1.2 9fceb02 -m "Message here"