class Crometheus::Counter

• Crometheus::Counter
• Crometheus::Metric
• Reference
• Object

Overview

Counter is a Metric type that stores a single value internally. This value can be reset to zero, but otherwises increases monotonically, and only when #inc is called.

require "crometheus/counter"

flowers_planted = Crometheus::Counter.new(
  :flowers_planted, "Number of flowers planted")
flowers_planted.inc 10
flowers_planted.inc
flowers_planted.inc
flowers_planted.get # => 12.0

Defined in:

Class Method Summary

• .type

  Returns Type::Counter.

Instance Method Summary

• #count_exceptions(&)

  Yields to the block, calling #inc if an exception is raised.

• #get : Float64

  Fetches the current counter value.

• #inc(x : Number::Primitive = 1.0)

  Increments the counter value by the given number, or 1.0.

• #reset

  Sets the counter value to 0.0.

• #samples(&block : Sample -> Nil) : Nil

  Yields a single Sample bearing the counter value.

Macro Summary

• count_exceptions_of_type(counter, ex_type, &block)

  Yields to the block, incrementing the given counter when an exception matching the given type is raised.

Class Method Detail

Instance Method Detail

require "crometheus/counter"
include Crometheus

def risky_code
  x = 1 / [1, 0].sample
end

counter = Counter.new :example, ""
100.times do
  begin
    counter.count_exceptions { risky_code }
  rescue DivisionByZero
  end
end
puts counter.get # approximately 50

Macro Detail