Class: GitLab::Exporter::SidekiqProber

Inherits:
Object
  • Object
show all
Defined in:
lib/gitlab_exporter/sidekiq.rb

Overview

A prober for Sidekiq queues

It takes the Redis URL Sidekiq is connected to

Constant Summary collapse

PROBE_JOBS_LIMIT =

The maximum depth (from the head) of each queue to probe. Probing the entirety of a very large queue will take longer and run the risk of timing out. But when we have a very large queue, we are most in need of reliable metrics. This trades off completeness for predictability by only taking a limited amount of items from the head of the queue.

1_000
POOL_SIZE = 
3
POOL_TIMEOUT =

This timeout is configured to higher interval than scrapping of Prometheus to ensure that connection is kept instead of needed to be re-initialized

90
SIDEKIQ_REDIS_LOCK =

Lock for Sidekiq.redis which we need to modify, but is not concurrency safe.

Mutex.new

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(metrics: PrometheusMetrics.new, logger: nil, **opts) ⇒ SidekiqProber

Returns a new instance of SidekiqProber.



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# File 'lib/gitlab_exporter/sidekiq.rb', line 40

def initialize(metrics: PrometheusMetrics.new, logger: nil, **opts)
  @opts    = opts
  @metrics = metrics
  @logger  = logger
end

Class Method Details

.connection_pool ⇒ Object 



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# File 'lib/gitlab_exporter/sidekiq.rb', line 32

def self.connection_pool
  @@connection_pool ||= Hash.new do |h, connection_hash| # rubocop:disable Style/ClassVars
    config = connection_hash.merge(pool_timeout: POOL_TIMEOUT, size: POOL_SIZE)

    h[connection_hash] = Sidekiq::RedisConnection.create(config)
  end
end

Instance Method Details

#probe_dead ⇒ Object 



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# File 'lib/gitlab_exporter/sidekiq.rb', line 167

def probe_dead
  puts "[DEPRECATED] probe_dead is now considered obsolete and will be removed in future major versions,"\
       " please use probe_stats instead"

  with_sidekiq do
    @metrics.add("sidekiq_dead_jobs", Sidekiq::Stats.new.dead_size)
  end

  self
end

#probe_future_sets ⇒ Object 



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# File 'lib/gitlab_exporter/sidekiq.rb', line 84

def probe_future_sets
  now = Time.now.to_f
  with_sidekiq do
    Sidekiq.redis do |conn|
      Sidekiq::Scheduled::SETS.each do |set|
        # Default to 0; if all jobs are due in the future, there is no "negative" delay.
        delay = 0

        _job, timestamp = conn.zrangebyscore(set, "-inf", now.to_s, limit: [0, 1], withscores: true).first
        delay = now - timestamp if timestamp

        @metrics.add("sidekiq_#{set}_set_processing_delay_seconds", delay)

        # zcount is O(log(N)) (prob. binary search), so is still quick even with large sets
        @metrics.add("sidekiq_#{set}_set_backlog_count",
                     conn.zcount(set, "-inf", now.to_s))
      end
    end
  end
end

#probe_jobs ⇒ Object 



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# File 'lib/gitlab_exporter/sidekiq.rb', line 77

def probe_jobs
  puts "[REMOVED] probe_jobs is now considered obsolete and does not emit any metrics,"\
       " please use probe_jobs_limit instead"

  self
end

#probe_jobs_limit ⇒ Object

Count worker classes present in Sidekiq queues. This only looks at the first PROBE_JOBS_LIMIT jobs in each queue. This means that we run a single LRANGE command for each queue, which does not block other commands. For queues over PROBE_JOBS_LIMIT in size, this means that we will not have completely accurate statistics, but the probe performance will also not degrade as the queue gets larger.



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# File 'lib/gitlab_exporter/sidekiq.rb', line 111

def probe_jobs_limit
  with_sidekiq do
    job_stats = Hash.new(0)

    Sidekiq::Queue.all.each do |queue|
      Sidekiq.redis do |conn|
        conn.lrange("queue:#{queue.name}", 0, PROBE_JOBS_LIMIT).each do |job|
          job_class = Sidekiq.load_json(job)["class"]

          job_stats[job_class] += 1
        end
      end
    end

    job_stats.each do |class_name, count|
      @metrics.add("sidekiq_enqueued_jobs", count, name: class_name)
    end
  end

  self
end

#probe_queues ⇒ Object 



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# File 'lib/gitlab_exporter/sidekiq.rb', line 65

def probe_queues
  with_sidekiq do
    Sidekiq::Queue.all.each do |queue|
      @metrics.add("sidekiq_queue_size", queue.size, name: queue.name)
      @metrics.add("sidekiq_queue_latency_seconds", queue.latency, name: queue.name)
      @metrics.add("sidekiq_queue_paused", queue.paused? ? 1 : 0, name: queue.name)
    end
  end

  self
end

#probe_retries ⇒ Object 



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# File 'lib/gitlab_exporter/sidekiq.rb', line 151

def probe_retries
  with_sidekiq do
    retry_stats = Hash.new(0)

    Sidekiq::RetrySet.new.map do |job|
      retry_stats[job.klass] += 1
    end

    retry_stats.each do |class_name, count|
      @metrics.add("sidekiq_to_be_retried_jobs", count, name: class_name)
    end
  end

  self
end

#probe_stats ⇒ Object 



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# File 'lib/gitlab_exporter/sidekiq.rb', line 46

def probe_stats
  with_sidekiq do
    stats = Sidekiq::Stats.new

    @metrics.add("sidekiq_jobs_processed_total", stats.processed)
    @metrics.add("sidekiq_jobs_failed_total", stats.failed)
    @metrics.add("sidekiq_jobs_enqueued_size", stats.enqueued)
    @metrics.add("sidekiq_jobs_scheduled_size", stats.scheduled_size)
    @metrics.add("sidekiq_jobs_retry_size", stats.retry_size)
    @metrics.add("sidekiq_jobs_dead_size", stats.dead_size)

    @metrics.add("sidekiq_default_queue_latency_seconds", stats.default_queue_latency)
    @metrics.add("sidekiq_processes_size", stats.processes_size)
    @metrics.add("sidekiq_workers_size", stats.workers_size)
  end

  self
end

#probe_workers ⇒ Object 



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# File 'lib/gitlab_exporter/sidekiq.rb', line 133

def probe_workers
  with_sidekiq do
    worker_stats = Hash.new(0)

    Sidekiq::Workers.new.map do |_pid, _tid, work|
      job_klass = work["payload"]["class"]

      worker_stats[job_klass] += 1
    end

    worker_stats.each do |class_name, count|
      @metrics.add("sidekiq_running_jobs", count, name: class_name)
    end
  end

  self
end

#write_to(target) ⇒ Object 



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# File 'lib/gitlab_exporter/sidekiq.rb', line 178

def write_to(target)
  target.write(@metrics.to_s)
end