Add a pull controller, use it for Prometheus #751
Merged
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This is a simplification of the existing code. Pulling updates is backwards for the usual Export() API.
*pull.Controller
implements aCollect()
andForEach()
methods, used by Prometheus. TheNewRawExporter()
function is removed, as a*prometheus.Exporter
always includes its Provider. This can be extended in the future, either to support a more configurable integrators or multiple integrators.