module Gitlab module Metrics module Subscribers # Class for tracking the total time spent in Rails cache calls # http://guides.rubyonrails.org/active_support_instrumentation.html class RailsCache < ActiveSupport::Subscriber attach_to :active_support def cache_read(event) observe(:read, event.duration) return unless current_transaction return if event.payload[:super_operation] == :fetch if event.payload[:hit] current_transaction.increment(:cache_read_hit_count, 1, false) else metric_cache_misses_total.increment(current_transaction.labels) current_transaction.increment(:cache_read_miss_count, 1, false) end end def cache_write(event) observe(:write, event.duration) end def cache_delete(event) observe(:delete, event.duration) end def cache_exist?(event) observe(:exists, event.duration) end def cache_fetch_hit(event) return unless current_transaction current_transaction.increment(:cache_read_hit_count, 1) end def cache_generate(event) return unless current_transaction metric_cache_misses_total.increment(current_transaction.labels) current_transaction.increment(:cache_read_miss_count, 1) end def observe(key, duration) return unless current_transaction metric_cache_operation_duration_seconds.observe(current_transaction.labels.merge({ operation: key }), duration / 1000.0) current_transaction.increment(:cache_duration, duration, false) current_transaction.increment(:cache_count, 1, false) current_transaction.increment("cache_#{key}_duration".to_sym, duration, false) current_transaction.increment("cache_#{key}_count".to_sym, 1, false) end private def current_transaction Transaction.current end def metric_cache_operation_duration_seconds @metric_cache_operation_duration_seconds ||= Gitlab::Metrics.histogram( :gitlab_cache_operation_duration_seconds, 'Cache access time', Transaction::BASE_LABELS.merge({ action: nil }), [0.001, 0.01, 0.1, 1, 10] ) end def metric_cache_misses_total @metric_cache_misses_total ||= Gitlab::Metrics.counter( :gitlab_cache_misses_total, 'Cache read miss', Transaction::BASE_LABELS ) end end end end end