prometheus
Interface for MetricVec (and subclasses)
Having an interface for MetricVec funcs like [Must]CurryWith, With[LabelValues], etc. -- parallel to ObserverVec -- would make it possible to generate mocks and thus facilitate unit testing for CounterVec, GaugeVec, HistogramVec, and SummaryVec.
Possibly related to #223?
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This would still be lovely to have. Will we survive with out it? For sure. But we would include a lot more unit tests around our metrics code, which we don't do much of today because it's Hard™.
The whole type structure could be improved indeed, but that would require an invasive change, which can only happen with a v2 major release.
In the meantime, you could make use of the fact that Go interfaces don't have to be defined in a particular package. You can define your own MetricVec interface and use it in your code as if they were defined in the client_golang/prometheus package itself.
Closing for now as promised, let us know if you need this to be reopened! 🤗