Class: Fluent::Plugin::Prometheus::Counter

Inherits:
Metric
  • Object
show all
Defined in:
lib/fluent/plugin/prometheus.rb

Instance Attribute Summary

Attributes inherited from Metric

#desc, #key, #name, #type

Instance Method Summary collapse

Methods inherited from Metric

get, #labels

Constructor Details

#initialize(element, registry, labels) ⇒ Counter

Returns a new instance of Counter.



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# File 'lib/fluent/plugin/prometheus.rb', line 224

def initialize(element, registry, labels)
  super
  begin
    @counter = registry.counter(element['name'].to_sym, docstring: element['desc'], labels: @base_labels.keys)
  rescue ::Prometheus::Client::Registry::AlreadyRegisteredError
    @counter = Fluent::Plugin::Prometheus::Metric.get(registry, element['name'].to_sym, :counter, element['desc'])
  end
end

Instance Method Details

#instrument(record, expander) ⇒ Object 



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# File 'lib/fluent/plugin/prometheus.rb', line 233

def instrument(record, expander)
  # use record value of the key if key is specified, otherwise just increment
  if @key.nil?
    value = 1
  elsif @key.is_a?(String)
    value = record[@key]
  else
    value = @key.call(record)
  end

  # ignore if record value is nil
  return if value.nil?

  @counter.increment(by: value, labels: labels(record, expander))
end