Package io.prometheus.client.exemplars
Interface HistogramExemplarSampler
- All Known Subinterfaces:
ExemplarSampler
- All Known Implementing Classes:
DefaultExemplarSampler
public interface HistogramExemplarSampler
Exemplar sampler for histogram metrics.
-
Method Summary
-
Method Details
-
sample
- Parameters:
value
- the value to be observed.bucketFrom
- upper boundary of the previous bucket in the histogram. Will beDouble.NEGATIVE_INFINITY
if there is no previous bucket.bucketTo
- upper boundary of this histogram bucket. Will beDouble.POSITIVE_INFINITY
if this is the last bucket.previous
- the previously sampled exemplar, ornull
if there is none.- Returns:
- an Exemplar to be sampled, or
null
if the previous exemplar does not need to be updated. Returningnull
and returningprevious
is equivalent.
-