/// <summary>
/// Generates <paramref name="count"/> count buckets, the first having the upper-incluse bound of start, others having an upper-inclusive bound that is the multiple of the previous bucket's upper-incluseive bound by <paramref name="factor"/>.
/// An extra bucket is implicitly generated for values over the specified buckets (<see href="https://prometheus.io/docs/instrumenting/writing_clientlibs/#histogram"/>).
///
/// The generated buckets are registered to <paramref name="builder"/>.
/// </summary>
/// <param name="builder">The builder to assign the buckets to.</param>
/// <param name="start">Inclusive upper bound of lowest bucket. Must be positive, non-zero, finite number.</param>
/// <param name="factor">The factor for scaling upper-inclusive bounds of subsequent buckets. Must be finite, greater than 1.</param>
/// <param name="count">Number of intervals create buckets for. At least 1</param>
/// <returns>the builder supplied in <paramref name="builder"/></returns>
public static IHistogramBuilder ExponentialBuckets(this IHistogramBuilder builder, double start, double factor, int count)
{
if (builder == null)
{
throw new ArgumentNullException(nameof(builder));
}
var generator = new ExponentialBucketGenerator();
var buckets = generator.ExponentialBuckets(start, factor, count);
builder.Buckets(buckets);
return(builder);
}
public void ExponentialBuckets_for_invalid_count_throws(int count)
{
Assert.Throws <ArgumentException>("count", () => generator.ExponentialBuckets(1, 10, count));
}