Struct Histogram 

pub struct Histogram {
    pub name: String,
    pub count: u64,
    pub sum_ns: u64,
    pub min_ns: u64,
    pub max_ns: u64,
    pub buckets: [u64; 11],
}

Histogram primitive — exponential buckets (powers of 10) plus sum/count/min/max. Deliberately minimalistic: no hdrhistogram dependency, but [u64; 10] buckets for 1ns..10s in 10x steps.

For full p99/p999 resolution the consumer can use hdrhistogram as a downstream sink — here we provide only the aggregate-free summable format that maps directly to OTLP Histogram.

Fields

name: String

Logical name (e.g. "dds.write.latency").

count: u64

Number of all records.

sum_ns: u64

Sum of all records (in the unit; default: ns).

min_ns: u64

Min value.

max_ns: u64

Max value.

buckets: [u64; 11]

Bucket counts: buckets[i] = how many records <= 10^i ns. 10 buckets for 1ns (10^0) to 10s (10^10).

Implementations

impl Histogram

pub fn new(name: impl Into<String>) -> Self

Constructor with name.

pub fn record_ns(&mut self, ns: u64)

Records a value in nanoseconds.

pub fn mean_ns(&self) -> u64

Mean in nanoseconds, or 0 if count=0.

pub fn bucket_bounds() -> [u64; 11]

Bucket boundaries as an array — for OTLP export. bounds[i] is the upper cutoff of buckets[i] in nanoseconds.

pub fn reset(&mut self)

Reset to empty state.

Trait Implementations

impl Clone for Histogram

fn clone(&self) -> Histogram

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Histogram

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

Formats the value using the given formatter.