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Histogram

elara_runtime::observability::metrics

Struct Histogram 

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

A histogram metric for tracking distributions of observations.

Histograms are used to track the distribution of values, such as:

  • Request latencies
  • Message sizes
  • Processing times

The histogram maintains counts in predefined buckets and can calculate percentiles (p50, p95, p99).

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impl Histogram

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pub fn new( name: String, buckets: Vec<f64>, labels: Vec<(String, String)>, ) -> Self

Creates a new histogram with the given name, buckets, and labels.

§Panics

Panics if buckets are empty or not sorted in ascending order.

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pub fn observe(&self, value: f64)

Records an observation in the histogram.

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pub fn get_count(&self) -> u64

Returns the total count of observations.

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pub fn get_sum(&self) -> f64

Returns the sum of all observations.

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pub fn get_buckets(&self) -> &[f64]

Returns the bucket boundaries.

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pub fn get_bucket_counts(&self) -> Vec<u64>

Returns the count for each bucket.

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

Calculates the specified percentile from the histogram data.

§Arguments
  • percentile - A value between 0.0 and 1.0 (e.g., 0.95 for p95)
§Returns

An estimated value at the given percentile, or 0.0 if no observations.

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pub fn name(&self) -> &str

Returns the name of the histogram.

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pub fn labels(&self) -> &HashMap<String, String>

Returns the labels associated with this histogram.

Trait Implementations§

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impl Clone for Histogram

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fn clone(&self) -> Histogram

Returns a duplicate of the value. Read more
1.0.0 · Source§

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

Performs copy-assignment from source. Read more

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fn into_request(self) -> Request<T>

Wrap the input message T in a tonic::Request
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