Oncilla 8ef02a61aa prometheus: add histogram support to exporter (#601) ... 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 #487 Co-authored-by: Rahul Patel <rahulpa@google.com>		2020-04-01 14:36:37 -07:00
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metric	prometheus: add histogram support to exporter (#601)	2020-04-01 14:36:37 -07:00
trace	Update License header for all source files (#586)	2020-03-23 22:41:10 -07:00