106 lines
2.8 KiB
Ruby
106 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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require 'prometheus/client'
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module Gitlab
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module Metrics
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module Prometheus
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extend ActiveSupport::Concern
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REGISTRY_MUTEX = Mutex.new
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PROVIDER_MUTEX = Mutex.new
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class_methods do
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include Gitlab::Utils::StrongMemoize
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def metrics_folder_present?
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multiprocess_files_dir = ::Prometheus::Client.configuration.multiprocess_files_dir
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multiprocess_files_dir &&
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::Dir.exist?(multiprocess_files_dir) &&
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::File.writable?(multiprocess_files_dir)
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end
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def prometheus_metrics_enabled?
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strong_memoize(:prometheus_metrics_enabled) do
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prometheus_metrics_enabled_unmemoized
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end
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end
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def reset_registry!
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clear_memoization(:registry)
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REGISTRY_MUTEX.synchronize do
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::Prometheus::Client.reset!
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end
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end
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def registry
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strong_memoize(:registry) do
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REGISTRY_MUTEX.synchronize do
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strong_memoize(:registry) do
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::Prometheus::Client.registry
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end
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end
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end
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end
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def counter(name, docstring, base_labels = {})
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safe_provide_metric(:counter, name, docstring, base_labels)
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end
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def summary(name, docstring, base_labels = {})
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safe_provide_metric(:summary, name, docstring, base_labels)
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end
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def gauge(name, docstring, base_labels = {}, multiprocess_mode = :all)
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safe_provide_metric(:gauge, name, docstring, base_labels, multiprocess_mode)
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end
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def histogram(name, docstring, base_labels = {}, buckets = ::Prometheus::Client::Histogram::DEFAULT_BUCKETS)
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safe_provide_metric(:histogram, name, docstring, base_labels, buckets)
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end
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def error_detected!
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set_error!(true)
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end
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def clear_errors!
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set_error!(false)
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end
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def set_error!(status)
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clear_memoization(:prometheus_metrics_enabled)
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PROVIDER_MUTEX.synchronize do
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@error = status
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end
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end
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private
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def safe_provide_metric(method, name, *args)
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metric = provide_metric(name)
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return metric if metric
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PROVIDER_MUTEX.synchronize do
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provide_metric(name) || registry.method(method).call(name, *args)
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end
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end
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def provide_metric(name)
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if prometheus_metrics_enabled?
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registry.get(name)
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else
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NullMetric.instance
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end
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end
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def prometheus_metrics_enabled_unmemoized
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!error? && metrics_folder_present? && Gitlab::CurrentSettings.prometheus_metrics_enabled || false
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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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