79 lines
2.7 KiB
Ruby
79 lines
2.7 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Metrics
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module Samplers
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class ThreadsSampler < BaseSampler
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DEFAULT_SAMPLING_INTERVAL_SECONDS = 5
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KNOWN_PUMA_THREAD_NAMES = ['puma worker check pipe', 'puma server',
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'puma threadpool reaper', 'puma threadpool trimmer',
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'puma worker check pipe', 'puma stat payload'].freeze
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SIDEKIQ_WORKER_THREAD_NAME = 'sidekiq_worker_thread'
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METRIC_PREFIX = "gitlab_ruby_threads_"
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METRIC_DESCRIPTIONS = {
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max_expected_threads: "Maximum number of threads expected to be running and performing application work",
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running_threads: "Number of running Ruby threads by name"
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}.freeze
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def metrics
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@metrics ||= METRIC_DESCRIPTIONS.each_with_object({}) do |(name, description), result|
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result[name] = ::Gitlab::Metrics.gauge(:"#{METRIC_PREFIX}#{name}", description)
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end
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end
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def sample
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metrics[:max_expected_threads].set({}, Gitlab::Runtime.max_threads)
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threads_by_name.each do |name, threads|
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uses_db, not_using_db = threads.partition { |thread| thread[:uses_db_connection] }
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set_running_threads(name, uses_db_connection: "yes", size: uses_db.size)
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set_running_threads(name, uses_db_connection: "no", size: not_using_db.size)
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end
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end
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private
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def set_running_threads(name, uses_db_connection:, size:)
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metrics[:running_threads].set({ thread_name: name, uses_db_connection: uses_db_connection }, size)
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end
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def threads_by_name
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Thread.list.group_by { |thread| name_for_thread(thread) }
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end
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def uses_db_connection(thread)
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thread[:uses_db_connection] ? "yes" : "no"
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end
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def name_for_thread(thread)
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thread_name = thread.name.to_s.presence
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if thread_name.presence.nil?
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'unnamed'
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elsif thread_name =~ /puma threadpool \d+/
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# These are the puma workers processing requests
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'puma threadpool'
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elsif use_thread_name?(thread_name)
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thread_name
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else
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'unrecognized'
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end
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end
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def use_thread_name?(thread_name)
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thread_name == SIDEKIQ_WORKER_THREAD_NAME ||
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# Samplers defined in `lib/gitlab/metrics/samplers`
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thread_name.ends_with?('sampler') ||
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# Exporters from `lib/gitlab/metrics/exporter`
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thread_name.ends_with?('exporter') ||
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KNOWN_PUMA_THREAD_NAMES.include?(thread_name)
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end
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end
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end
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end
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end
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