histogram: expose FindBucket in Histogram API #3
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In order to record observations into multiple histograms efficiently,
it is helpful to be able to execute the
findBucket
call on theclient-side and then use the bucket to update multiple histogram
instances.
This change makes
FindBucket
andObserveInternal
public andintroduces the
HistogramInternal
interface to expose them sinceHistogram
itself is implemented by many implementations we want toavoid modifying.