Commits on Oct 15, 2020

1. Export MetricVec (again) …

   MetricVec was already exported in early versions of this library, but
   nobody really used it to implement vectors of custom Metric
   implementations. Now #796 has shown up with a fairly special use case
   for which I'd prefer a custom implementation of a special
   "auto-sampling histogram" outside of this library. Therefore, I'd like
   to reinstate support for creating vectors of custom Metric
   implementations.
   
   I played around for quite some while with the option of a separate
   package providing the tools one would need to create vectors of custom
   Metric implementations. However, with the current structure of the
   prometheus/client_golang/prometheus package, this leads to a lot of
   complications with circular dependencies. (The new package would need
   the primitives from the prometheus package, while the existing metric
   vectors like GaugeVec need to import the new vector package to not
   duplicate the implementation. Separating vector types from the main
   prometheus package is out of the question at this point because that
   would be a breaking change.)
   
   Signed-off-by: beorn7 <beorn@grafana.com>

   

   beorn7 committed Oct 15, 2020
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