Struct GapStats 

pub struct GapStats {
    pub count: u64,
    pub retained: usize,
    pub mean_ms: f64,
    pub stddev_ms: f64,
    pub max_ms: f64,
    pub p50_ms: f64,
    pub p90_ms: f64,
    pub p99_ms: f64,
}

2026-09-26: One response’s (or one pool’s) arrival-gap distribution, in ms.

Fields

count: u64

2026-09-26: Gaps observed.

retained: usize

2026-09-26: Gaps the percentiles were computed over (< count only when a response ran past RETAIN_CAP).

mean_ms: f64

stddev_ms: f64

max_ms: f64

2026-09-26: A stall is a tail event; the mean hides it and this does not.

p50_ms: f64

p90_ms: f64

p99_ms: f64

Implementations

impl GapStats

pub fn stability(&self) -> Option<f64>

2026-09-26: stability = (p99 − p50) / p50: the arrival-gap tail spread relative to its median. Dimensionless, so it compares runs whose absolute step times differ.

Lower is better: it is a dispersion measure, and 0 means no tail at all. None unless p50 is positive and finite and p99 is finite.

pub fn cv(&self) -> Option<f64>

2026-09-26: Coefficient of variation, σ / mean. Also a dispersion measure: lower is better. None unless the mean is positive.

pub fn metrics(&self, prefix: &str, m: &mut BTreeMap<String, f64>)

2026-09-26: The record keys, under prefix (e.g. "c8_" or ""). The primitives always; the two derived ratios only when defined.

Trait Implementations

impl Clone for GapStats

fn clone(&self) -> GapStats

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for GapStats

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

Formats the value using the given formatter.

impl Default for GapStats

fn default() -> GapStats

Returns the “default value” for a type.

impl PartialEq for GapStats

fn eq(&self, other: &GapStats) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for GapStats

impl StructuralPartialEq for GapStats