[pkg-go] Bug#921522: prometheus: promtool does not have an update command (?)

[Santiago Vila]

> > Maybe this feature could be backported from the backport to the
> > version in buster? :-)
> 
> So I checked with upstream, they decided to remove it because for them
> it is already obsolete.. I will try to backport this, but it could be
> tricky as the codebase has evolved since this was removed.

If that becomes very tricky, another option would be to upload the
current version in stretch-backports with the name prometheus-promtool
and essentially remove everything but /usr/bin/promtool from the .deb.

Thanks.