prometheus-net

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namespace Prometheus;
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public interface IHistogram : IObserver
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{
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    /// <summary>
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    /// Observe multiple events with a given value.
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    /// 
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    /// Intended to support high frequency or batch processing use cases utilizing pre-aggregation.
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    /// </summary>
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    /// <param name="val">Measured value.</param>
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    /// <param name="count">Number of observations with this value.</param>
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    void Observe(double val, long count);
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    /// <summary>
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    /// Observe an event with an exemplar
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    /// </summary>
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    /// <param name="val">Measured value.</param>
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    /// <param name="exemplar">
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    /// A set of labels representing an exemplar, created using Exemplar.From().
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    /// If null, the default exemplar provider associated with the metric is asked to provide an exemplar.
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    /// Pass Exemplar.None to explicitly record an observation without an exemplar.
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    /// </param>
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    void Observe(double val, Exemplar? exemplar);
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    /// <summary>
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    /// Gets the sum of all observed events.
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    /// </summary>
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    double Sum { get; }
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    /// <summary>
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    /// Gets the count of all observed events.
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    /// </summary>
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    long Count { get; }
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}
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