Bug#866920: Pending fixes for bugs in the prometheus package

[pkg-go-maintainers]

tag 866920 + pending
thanks

Some bugs in the prometheus package are closed in revision
7c4dc9744d5921978827cfb1db4d6431a433aaa9 in branch 'debian/sid' by
Martín Ferrari

The full diff can be seen at
https://anonscm.debian.org/cgit/pkg-go/packages/prometheus.git/commit/?id=7c4dc97

Commit message:

    Use new goleveldb package name. Closes: #866920.