class PrometheusExporter::Server::PumaCollector

Constants

MAX_PUMA_METRIC_AGE
PUMA_GAUGES

Public Class Methods

new() click to toggle source
# File lib/prometheus_exporter/server/puma_collector.rb, line 16
def initialize
  @puma_metrics = []
end

Public Instance Methods

collect(obj) click to toggle source
# File lib/prometheus_exporter/server/puma_collector.rb, line 53
def collect(obj)
  now = ::Process.clock_gettime(::Process::CLOCK_MONOTONIC)

  obj["created_at"] = now

  @puma_metrics.delete_if do |current|
    (obj["pid"] == current["pid"] && obj["hostname"] == current["hostname"]) ||
      (current["created_at"] + MAX_PUMA_METRIC_AGE < now)
  end

  @puma_metrics << obj
end
metrics() click to toggle source
# File lib/prometheus_exporter/server/puma_collector.rb, line 24
def metrics
  return [] if @puma_metrics.length == 0

  metrics = {}

  @puma_metrics.map do |m|
    labels = {}
    if m["phase"]
      labels.merge!(phase: m["phase"])
    end
    if m["custom_labels"]
      labels.merge!(m["custom_labels"])
    end
    if m["metric_labels"]
      labels.merge!(m["metric_labels"])
    end

    PUMA_GAUGES.map do |k, help|
      k = k.to_s
      if v = m[k]
        g = metrics[k] ||= PrometheusExporter::Metric::Gauge.new("puma_#{k}", help)
        g.observe(v, labels)
      end
    end
  end

  metrics.values
end
type() click to toggle source
# File lib/prometheus_exporter/server/puma_collector.rb, line 20
def type
  "puma"
end