prometheus: add histogram support to exporter #601
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This PR adds histogram support to the prometheus exporter. - Adds a new aggregator selector that returns a histogram for `MeasureKind`. The selector can be constructed using `simple.NewWithHistogramMeasure` - Adds support for histogram aggregators in prometheus collect method. With this PR, the default selector is changed to use histograms. In order to support the prometheus histogram, the `aggregator.Histogram` interface is extended with the `Sum` method. fixes open-telemetry#487
oncilla
requested review from
jmacd,
krnowak,
lizthegrey,
MrAlias,
paivagustavo,
rghetia and
tedsuo
as code owners
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rghetia
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Apr 1, 2020
paivagustavo
approved these changes
Apr 1, 2020
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This PR adds histogram support to the prometheus exporter.
MeasureKind.The selector can be constructed using
simple.NewWithHistogramMeasureWith this PR, the default selector is changed to use histograms.
In order to support the prometheus histogram, the
aggregator.Histograminterface is extended with the
Summethod.fixes #487
This change is