class Prometheus::Histogram

• Prometheus::Histogram
• Prometheus::Metric
• Reference
• Object

Overview

A Histogram samples observations (usually things like request durations or response sizes) and counts them in configurable buckets.

Use a Histogram to track size distributions, such as:

• Request duration
• Response sizes
• Queue length variations

Example:

# Create with custom buckets
histogram = Histogram.new(
  "response_time",
  "Response time in seconds",
  [0.1, 0.5, 1.0, 2.0, 5.0]
)

# Observe values
histogram.observe(0.25)

Histograms track:

• Count per bucket (number of values <= bucket upper bound)
• Total sum of all observed values
• Count of all observed values

Defined in:

Constructors

• .new(name : String, help : String, buckets : Array(Float64), labels = LabelSet.new)

Instance Method Summary

• #collect : Array(Sample)
• #observe(value : Number)
• #type : String

Constructor Detail

Instance Method Detail