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# frozen_string_literal: true
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_multi(event)
observe(:read_multi, event)
return unless current_transaction
labels = { store: extract_store_name(event) }
current_transaction.observe(:gitlab_cache_read_multikey_count, event.payload[:key].size, labels) do
buckets [10, 50, 100, 1000]
docstring 'Number of keys for mget in read_multi/fetch_multi'
end
end
def cache_read(event)
observe(:read, event)
return unless current_transaction
return if event.payload[:super_operation] == :fetch
track_cache_miss(event) unless event.payload[:hit]
end
def cache_write(event)
observe(:write, event)
end
def cache_delete(event)
observe(:delete, event)
end
def cache_exist?(event)
observe(:exists, event)
end
def cache_fetch_hit(event)
return unless current_transaction
labels = { store: extract_store_name(event) }
current_transaction.increment(:gitlab_transaction_cache_read_hit_count_total, 1, labels)
end
def cache_generate(event)
return unless current_transaction
track_cache_miss(event)
labels = { store: extract_store_name(event) }
current_transaction.increment(:gitlab_transaction_cache_read_miss_count_total, 1, labels)
end
def observe(key, event)
return unless current_transaction
labels = { operation: key, store: extract_store_name(event) }
current_transaction.increment(:gitlab_cache_operations_total, 1, labels) do
docstring 'Cache operations'
label_keys labels.keys
end
metric_cache_operation_duration_seconds.observe(labels, event.duration / 1000.0)
end
private
def track_cache_miss(event)
# avoid passing in labels to ensure metric has consistent set of labels
labels = { store: extract_store_name(event) }
current_transaction.increment(:gitlab_cache_misses_total, 1, labels) do
docstring 'Cache read miss'
end
end
def extract_store_name(event)
# see payload documentation in https://guides.rubyonrails.org/active_support_instrumentation.html#active-support
event.payload[:store].to_s.split('::').last
end
def current_transaction
::Gitlab::Metrics::WebTransaction.current
end
def metric_cache_operation_duration_seconds
@metric_cache_operation_duration_seconds ||= ::Gitlab::Metrics.histogram(
:gitlab_cache_operation_duration_seconds,
'Cache access time',
{},
Gitlab::Instrumentation::Redis::QUERY_TIME_BUCKETS
)
end
end
end
end
end
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