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# frozen_string_literal: true
# Instrumentation for cache efficiency metrics
module Gitlab
module Cache
class Metrics
DEFAULT_BUCKETS = [0, 1, 5].freeze
def initialize(cache_metadata)
@cache_metadata = cache_metadata
end
# Increase cache hit counter
#
def increment_cache_hit(labels = {})
counter.increment(base_labels.merge(labels, cache_hit: true))
end
# Increase cache miss counter
#
def increment_cache_miss(labels = {})
counter.increment(base_labels.merge(labels, cache_hit: false))
end
# Measure the duration of cacheable action
#
# @example
# observe_cache_generation do
# cacheable_action
# end
#
def observe_cache_generation(labels = {}, &block)
real_start = Gitlab::Metrics::System.monotonic_time
value = yield
histogram.observe(base_labels.merge(labels), Gitlab::Metrics::System.monotonic_time - real_start)
value
end
private
attr_reader :cache_metadata
def counter
@counter ||= Gitlab::Metrics.counter(
:redis_hit_miss_operations_total,
"Hit/miss Redis cache counter",
base_labels
)
end
def histogram
@histogram ||= Gitlab::Metrics.histogram(
:redis_cache_generation_duration_seconds,
'Duration of Redis cache generation',
base_labels,
DEFAULT_BUCKETS
)
end
def base_labels
@base_labels ||= {
cache_identifier: cache_metadata.cache_identifier,
feature_category: cache_metadata.feature_category,
backing_resource: cache_metadata.backing_resource
}
end
end
end
end
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