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Histogram

scirs2_core::structured_logging::metrics

Struct Histogram 

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pub struct Histogram { /* private fields */ }
Expand description

A histogram that distributes observations into configurable buckets.

Follows the Prometheus/OTel convention: each bucket counts observations whose value is ≤ upper_bound (i.e. cumulative).

A +Inf bucket is always added implicitly.

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impl Histogram

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pub fn new(name: impl Into<String>, boundaries: &[f64]) -> Self

Create a histogram with the given name and bucket boundaries.

boundaries are sorted internally; duplicates are removed.

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pub fn record(&self, value: f64)

Record a single observation.

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pub fn buckets(&self) -> Vec<(f64, u64)>

Return (upper_bound, cumulative_count) pairs for each bucket.

The last bucket always has f64::INFINITY as the upper bound.

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pub fn count(&self) -> u64

Total number of observations recorded.

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pub fn sum(&self) -> f64

Sum of all recorded values.

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pub fn name(&self) -> &str

Return the metric name.

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pub fn percentile(&self, p: f64) -> f64

Compute an approximate percentile from retained samples.

p should be in [0.0, 100.0]. Returns 0.0 when no samples have been recorded.

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pub fn p50(&self) -> f64

50th percentile (median).

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pub fn p95(&self) -> f64

95th percentile.

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pub fn p99(&self) -> f64

99th percentile.

Trait Implementations§

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impl Debug for Histogram

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

Formats the value using the given formatter. Read more

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