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# encoding: UTF-8
require 'prometheus/client/metric'
module Prometheus
module Client
# Counter is a metric that exposes merely a sum or tally of things.
class Counter < Metric
def type
:counter
end
def increment(labels = {}, by = 1)
raise ArgumentError, 'increment must be a non-negative number' if by < 0
label_set = label_set_for(labels)
synchronize { @values[label_set].increment(by) }
end
private
def default(labels)
value_object(type, @name, @name, labels)
end
end
end
end
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