71 lines
2.1 KiB
Ruby
71 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Metrics
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module Subscribers
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class LoadBalancing < ActiveSupport::Subscriber
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attach_to :load_balancing
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PROMETHEUS_COUNTER = :gitlab_transaction_caught_up_replica_pick_count_total
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LOG_COUNTERS = { true => :caught_up_replica_pick_ok, false => :caught_up_replica_pick_fail }.freeze
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def caught_up_replica_pick(event)
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return unless Gitlab::SafeRequestStore.active?
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result = event.payload[:result]
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counter_name = counter(result)
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increment(counter_name)
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end
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# we want to update Prometheus counter after the controller/action are set
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def web_transaction_completed(_event)
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return unless Gitlab::SafeRequestStore.active?
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LOG_COUNTERS.keys.each { |result| increment_prometheus_for_result_label(result) }
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end
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def self.load_balancing_payload
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return {} unless Gitlab::SafeRequestStore.active?
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{}.tap do |payload|
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LOG_COUNTERS.values.each do |counter|
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value = Gitlab::SafeRequestStore[counter]
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payload[counter] = value.to_i if value
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end
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end
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end
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private
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def increment(counter)
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Gitlab::SafeRequestStore[counter] = Gitlab::SafeRequestStore[counter].to_i + 1
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end
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def increment_prometheus_for_result_label(label_value)
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counter_name = counter(label_value)
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return unless (counter_value = Gitlab::SafeRequestStore[counter_name])
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increment_prometheus(labels: { result: label_value }, value: counter_value.to_i)
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end
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def increment_prometheus(labels:, value:)
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current_transaction&.increment(PROMETHEUS_COUNTER, value, labels) do
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docstring 'Caught up replica pick result'
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label_keys labels.keys
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end
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end
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def counter(result)
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LOG_COUNTERS[result]
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end
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def current_transaction
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::Gitlab::Metrics::WebTransaction.current
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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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