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require 'prometheus/client'
module Gitlab
module Metrics
module Prometheus
include Gitlab::CurrentSettings
def metrics_folder_present?
multiprocess_files_dir = ::Prometheus::Client.configuration.multiprocess_files_dir
multiprocess_files_dir &&
::Dir.exist?(multiprocess_files_dir) &&
::File.writable?(multiprocess_files_dir)
end
def prometheus_metrics_enabled?
return @prometheus_metrics_enabled if defined?(@prometheus_metrics_enabled)
@prometheus_metrics_enabled = prometheus_metrics_enabled_unmemoized
end
def registry
@registry ||= ::Prometheus::Client.registry
end
def counter(name, docstring, base_labels = {})
provide_metric(name) || registry.counter(name, docstring, base_labels)
end
def summary(name, docstring, base_labels = {})
provide_metric(name) || registry.summary(name, docstring, base_labels)
end
def gauge(name, docstring, base_labels = {}, multiprocess_mode = :all)
provide_metric(name) || registry.gauge(name, docstring, base_labels, multiprocess_mode)
end
def histogram(name, docstring, base_labels = {}, buckets = ::Prometheus::Client::Histogram::DEFAULT_BUCKETS)
provide_metric(name) || registry.histogram(name, docstring, base_labels, buckets)
end
def provide_metric(name)
if prometheus_metrics_enabled?
registry.get(name)
else
NullMetric.new
end
end
private
def prometheus_metrics_enabled_unmemoized
metrics_folder_present? && current_application_settings[:prometheus_metrics_enabled] || false
end
end
end
end
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