Struct Histogram 

pub struct Histogram { /* private fields */ }

Fixed-bucket latency histogram (microsecond samples).

Buckets are cumulative on render, per Prometheus convention.

Implementations

impl Histogram

pub fn new(bounds_us: &[u64]) -> Self

Create a histogram with the given bucket upper bounds (µs, ascending).

pub fn observe_us(&self, us: u64)

Record a sample in microseconds.

pub fn count(&self) -> u64

Total number of samples.

pub fn quantile_us(&self, q: f64) -> u64

Approximate quantile (µs) from bucket boundaries. Returns the upper bound of the bucket containing quantile q (0.0–1.0); a target that lands above every bounded bucket returns the sentinel below.

A q whose target is served only by samples in the implicit +Inf bucket returns u64::MAX as a sentinel: this signals “beyond top bucket” instead of silently under-reporting bounds_us.last().

Trait Implementations

impl Debug for Histogram

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.