Why is needs-upstream-report tag kubuntu-specific?

[Savvas Radevic]

dholbach has just explained why:
09:07:42 < dholbach> savvas: I don't see why the tag should be used at
all - we can simply open en empty upstream task
09:08:14 < dholbach> savvas: and can query it from the advanced bug page
09:10:23 < dholbach> savvas: on the advanced bug page it's "Show bugs
that need to be forwarded to an upstream bug tracker

So it's easy to find:
https://bugs.launchpad.net/ubuntu/+bugs?field.status_upstream-empty-marker=1

We simply open an empty upstream task by clicking on "Also affects
project" on the bug page!