Data.Metrics.Histogram.Internal

The pure interface for histograms. This module is typically not as useful as the stateful implementation since reservoir updates require retrieving the current time.

Documentation

data Histogram

A pure histogram that maintains a bounded reservoir of samples and basic statistical data about the samples.

Instances

HasHistogram Timer Histogram

Methods

histogram :: Lens' Timer Histogram

histogram :: Reservoir -> Histogram

Create a histogram using a custom reservoir.

clear :: NominalDiffTime -> Histogram -> Histogram

Reset all statistics, in addition to the underlying reservoir.

update :: Double -> NominalDiffTime -> Histogram -> Histogram

Update statistics and the reservoir with a new sample.

mean :: Histogram -> Double

Get the average of all samples since the histogram was created.

stddev :: Histogram -> Double

Get the standard deviation of all samples.

variance :: Histogram -> Double

Get the variance of all samples.

minVal :: Histogram -> Double

Get the minimum value of all samples.

maxVal :: Histogram -> Double

Get the maximum value of all samples

count :: Histogram -> Int

Get the number of samples that the histogram has been updated with.

snapshot :: Histogram -> Snapshot

Get a snapshot of the current reservoir's samples.