Default histogram buckets:

iex(2)> Prometheus.Buckets.default()
[0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.5, 1, 2.5, 5, 10]

Please note these buckets are floats and represent seconds so you’ll have to use Prometheus.Metric.Histogram.dobserve/2 or configure duration_unit as :seconds.

Creates count buckets, where the lowest bucket has an upper bound of start and each following bucket’s upper bound is factor times the previous bucket’s upper bound. The returned list is meant to be used for the :buckets key of histogram constructors options.

iex(2)> Prometheus.Buckets.exponential(100, 1.2, 3)
[100, 120, 144]

The function raises Prometheus.InvalidValueError if count is 0 or negative, if start is 0 or negative, or if factor is less than or equals to 1.

Creates count buckets, each width wide, where the lowest bucket has an upper bound of start. The returned list is meant to be used for the :buckets key of histogram constructors options.

iex(2)> Prometheus.Buckets.linear(10, 5, 6)
[10, 15, 20, 25, 30, 35]

The function raises Prometheus.InvalidValueError exception if count is zero or negative.