From https://docs.pagure.org/rpkg-util/v3/quick_start.html#new-project we see:
If you now display the tags, you get: $ git tag 0.1 0.2 0.3 0.4
But actually, there is no tags pushed so far.
They are present. You can see them here:
https://pagure.io/hello_rpkg_existing/releases
Actually, the problem in docs
https://docs.pagure.org/rpkg-util/v3/quick_start.html#new-project
where requested "git clone https://pagure.io/hello_rpkg.git" (where I see no tags) or may be https://pagure.io/hello_rpkg.git project, so the issue must be moved to https://pagure.io/hello_rpkg.git
Yes, but the tags are only needed for https://docs.pagure.org/rpkg-util/v3/quick_start.html#existing-project section in which hello_rpkg_existing is cloned. They are not needed for https://docs.pagure.org/rpkg-util/v3/quick_start.html#new-project where hello_rpkg is cloned.
hello_rpkg_existing
hello_rpkg
The git tag command is in #existing-project section so I think everything should be OK.
git tag
#existing-project