Struct LatencyHistogram 

pub struct LatencyHistogram { /* private fields */ }

HDR histogram for recording request latencies.

Records durations in microseconds. Covers 1µs to 1 hour at 3 significant digits of precision. Provides exact quantile queries with bounded error.

Implementations

impl LatencyHistogram

pub fn new() -> Self

Creates a new histogram covering 1µs to 1 hour at 3 significant digits.

pub fn record(&mut self, d: Duration)

Records a duration. Values are clamped to [1µs, 1 hour].

pub fn quantile_ms(&self, q: f64) -> f64

Returns the value at quantile q (0.0–1.0) in milliseconds.

pub fn min_ms(&self) -> f64

Returns the minimum recorded value in milliseconds.

pub fn max_ms(&self) -> f64

Returns the maximum recorded value in milliseconds.

pub fn mean_ms(&self) -> f64

Returns the arithmetic mean of recorded values in milliseconds.

pub fn total_count(&self) -> u64

Returns the total number of recorded values.

pub fn is_empty(&self) -> bool

Returns true if no values have been recorded.

pub fn iter_recorded_us(&self) -> impl Iterator<Item = (u64, u64)> + '_

Returns (value_us, count) pairs for all recorded distinct values. Used by the CLI to render the latency bar chart.

Trait Implementations

impl Default for LatencyHistogram

fn default() -> Self

Returns the “default value” for a type.