Class: PrometheusExporter::Server::PumaCollector

Inherits:
TypeCollector show all
Defined in:
lib/prometheus_exporter/server/puma_collector.rb

Constant Summary collapse

MAX_PUMA_METRIC_AGE = 
30
PUMA_GAUGES = 
{
  workers: "Number of puma workers.",
  booted_workers: "Number of puma workers booted.",
  old_workers: "Number of old puma workers.",
  running_threads: "Number of puma threads currently running.",
  request_backlog: "Number of requests waiting to be processed by a puma thread.",
  thread_pool_capacity: "Number of puma threads available at current scale.",
  max_threads: "Number of puma threads at available at max scale.",
}

Instance Method Summary collapse

Constructor Details

#initialize ⇒ PumaCollector

Returns a new instance of PumaCollector.



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# File 'lib/prometheus_exporter/server/puma_collector.rb', line 16

def initialize
  @puma_metrics = []
end

Instance Method Details

#collect(obj) ⇒ Object 



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# 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 ⇒ Object 



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# 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 ⇒ Object 



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# File 'lib/prometheus_exporter/server/puma_collector.rb', line 20

def type
  "puma"
end