Class: LogStash::Outputs::Prometheus

Inherits:
Base
  • Object
show all
Defined in:
lib/logstash/outputs/prometheus.rb

Overview

An prometheus output that does nothing.

Instance Method Summary collapse

Instance Method Details

#kill_thread ⇒ Object

def register



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# File 'lib/logstash/outputs/prometheus.rb', line 92

def kill_thread()
	@thread.kill
	$prom_servers[@port] = nil
end

#receive(event) ⇒ Object 



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# File 'lib/logstash/outputs/prometheus.rb', line 111

def receive(event)
  @increment.each do |metric_name, val|
    labels = setup_event_labels(val, event)
    $metrics[port.to_s + metric_name].increment(labels: labels)
  end

  @decrement.each do |metric_name, val|
    labels = setup_event_labels(val, event)
    $metrics[port.to_s + metric_name].decrement(labels: labels)
  end

  @set.each do |metric_name, val|
    labels = setup_event_labels(val, event)
    $metrics[port.to_s + metric_name].set(event.sprintf(val['value']).to_f,labels: labels)
  end

  @timer.each do |metric_name, val|
    labels = setup_event_labels(val, event)
    $metrics[port.to_s + metric_name].observe(event.sprintf(val['value']).to_f,labels: labels)
  end
end

#register ⇒ Object 



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# File 'lib/logstash/outputs/prometheus.rb', line 24

def register
  $prom_servers ||= {}
  $metrics ||= {}

  if $prom_servers[@port].nil?
    $prom_servers[@port] = Prometheus::Client::Registry.new
    prom_server = $prom_servers[@port]

    app =
    Rack::Builder.new(@port) do
      use ::Rack::Deflater
      use ::Prometheus::Middleware::Exporter, registry: prom_server

      run ->(_) { [200, {'Content-Type' => 'text/html'}, ['Please access /metrics to see exposed metrics for this Logstash instance.']] }
    end.to_app

    @thread = Thread.new do
      Rack::Handler::WEBrick.run(app, Port: @port, BindAddress: "0.0.0.0", Host: "0.0.0.0")
    end
  end

  prom_server = $prom_servers[@port]

  @increment.each do |metric_name, val|
  	val = setup_registry_labels(val)
    if $metrics[port.to_s + metric_name].nil?
      if val['type'] == "gauge"
        metric = prom_server.gauge(metric_name.to_sym, docstring: val['description'], labels: val['labels'].keys)
      else
        metric = prom_server.counter(metric_name.to_sym, docstring: val['description'], labels: val['labels'].keys)
      end
      $metrics[port.to_s + metric_name] = metric
    end
  end

  @decrement.each do |metric_name, val|
    val = setup_registry_labels(val)
    if $metrics[port.to_s + metric_name].nil?
      metric = prom_server.gauge(metric_name.to_sym, docstring: val['description'], labels: val['labels'].keys)

      $metrics[port.to_s + metric_name] = metric
    end
  end

  @set.each do |metric_name, val|
    val = setup_registry_labels(val)
    if $metrics[port.to_s + metric_name].nil?
      metric = prom_server.gauge(metric_name.to_sym, docstring: val['description'], labels: val['labels'].keys)

      $metrics[port.to_s + metric_name] = metric
    end
  end

  @timer.each do |metric_name, val|
    val = setup_registry_labels(val)

    if $metrics[port.to_s + metric_name].nil?
      if val['type'] == "histogram"
        metric = prom_server.histogram(metric_name.to_sym, docstring: val['description'], labels: val['labels'].keys, buckets: val['buckets'])
      else
        metric = prom_server.summary(metric_name.to_sym, labels: val['labels'].keys, docstring: val['description'])
      end

      $metrics[port.to_s + metric_name] = metric
    end
  end
end