debian-mirror-gitlab/lib/gitlab/metrics/prometheus.rb

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