Interface HistogramExemplarSampler

All Known Subinterfaces:

ExemplarSampler

All Known Implementing Classes:

DefaultExemplarSampler

public interface HistogramExemplarSampler

Exemplar sampler for histogram metrics.

Method Summary

Modifier and Type	Method	Description
Exemplar	sample(double value, double bucketFrom, double bucketTo, Exemplar previous)

Method Details

sample

Exemplar sample(double value,
 double bucketFrom,
 double bucketTo,
 Exemplar previous)

Parameters:

value - the value to be observed.

bucketFrom - upper boundary of the previous bucket in the histogram. Will be Double.NEGATIVE_INFINITY if there is no previous bucket.

bucketTo - upper boundary of this histogram bucket. Will be Double.POSITIVE_INFINITY if this is the last bucket.

previous - the previously sampled exemplar, or null if there is none.

Returns:

an Exemplar to be sampled, or null if the previous exemplar does not need to be updated. Returning null and returning previous is equivalent.