Bug#870147: Pending fixes for bugs in the prometheus package

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tag 870147 + pending
thanks

Some bugs in the prometheus package are closed in revision
ded51c78efbe9ca96680b5a10bb81bff40a8fc7f 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=ded51c7

Commit message:

debian/default: Update description of flags. Closes: #870147.