BigW Consortium Gitlab

prometheus.rb 1.68 KB
Newer Older
1 2 3 4 5 6 7
require 'prometheus/client'

module Gitlab
  module Metrics
    module Prometheus
      include Gitlab::CurrentSettings

8
      def metrics_folder_present?
9 10 11 12 13
        multiprocess_files_dir = ::Prometheus::Client.configuration.multiprocess_files_dir

        multiprocess_files_dir &&
          ::Dir.exist?(multiprocess_files_dir) &&
          ::File.writable?(multiprocess_files_dir)
14 15
      end

16
      def prometheus_metrics_enabled?
17 18 19
        return @prometheus_metrics_enabled if defined?(@prometheus_metrics_enabled)

        @prometheus_metrics_enabled = prometheus_metrics_enabled_unmemoized
20 21 22 23 24 25 26 27 28 29 30 31 32 33
      end

      def registry
        @registry ||= ::Prometheus::Client.registry
      end

      def counter(name, docstring, base_labels = {})
        provide_metric(name) || registry.counter(name, docstring, base_labels)
      end

      def summary(name, docstring, base_labels = {})
        provide_metric(name) || registry.summary(name, docstring, base_labels)
      end

34 35
      def gauge(name, docstring, base_labels = {}, multiprocess_mode = :all)
        provide_metric(name) || registry.gauge(name, docstring, base_labels, multiprocess_mode)
36 37 38 39 40 41 42 43 44 45 46 47 48
      end

      def histogram(name, docstring, base_labels = {}, buckets = ::Prometheus::Client::Histogram::DEFAULT_BUCKETS)
        provide_metric(name) || registry.histogram(name, docstring, base_labels, buckets)
      end

      def provide_metric(name)
        if prometheus_metrics_enabled?
          registry.get(name)
        else
          NullMetric.new
        end
      end
49 50 51 52 53 54

      private

      def prometheus_metrics_enabled_unmemoized
        metrics_folder_present? && current_application_settings[:prometheus_metrics_enabled] || false
      end
55 56
    end
  end
57
end