class Fluent::Plugin::Prometheus::Gauge

Public Class Methods

new(element, registry, labels) click to toggle source
Calls superclass method Fluent::Plugin::Prometheus::Metric::new
# File lib/fluent/plugin/prometheus.rb, line 279
def initialize(element, registry, labels)
  super
  if @key.nil?
    raise ConfigError, "gauge metric requires 'key' option"
  end

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

  if @initialized
    Fluent::Plugin::Prometheus::Metric.init_label_set(@gauge, @base_initlabels, @base_labels)
  end
end

Public Instance Methods

instrument(record, expander) click to toggle source
# File lib/fluent/plugin/prometheus.rb, line 296
def instrument(record, expander)
  if @key.is_a?(String)
    value = record[@key]
  else
    value = @key.call(record)
  end
  if value
    @gauge.set(value, labels: labels(record, expander))
  end
end