87 lines
2.3 KiB
Ruby
87 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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# Instrumentation for cache efficiency metrics
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module Gitlab
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module Cache
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class Metrics
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DEFAULT_BUCKETS = [0, 1, 5].freeze
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VALID_BACKING_RESOURCES = [:cpu, :database, :gitaly, :memory, :unknown].freeze
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DEFAULT_BACKING_RESOURCE = :unknown
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def initialize(
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caller_id:,
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cache_identifier:,
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feature_category: ::Gitlab::FeatureCategories::FEATURE_CATEGORY_DEFAULT,
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backing_resource: DEFAULT_BACKING_RESOURCE
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)
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@caller_id = caller_id
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@cache_identifier = cache_identifier
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@feature_category = Gitlab::FeatureCategories.default.get!(feature_category)
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@backing_resource = fetch_backing_resource!(backing_resource)
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end
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# Increase cache hit counter
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#
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def increment_cache_hit
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counter.increment(labels.merge(cache_hit: true))
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end
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# Increase cache miss counter
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#
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def increment_cache_miss
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counter.increment(labels.merge(cache_hit: false))
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end
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# Measure the duration of cacheable action
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#
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# @example
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# observe_cache_generation do
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# cacheable_action
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# end
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#
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def observe_cache_generation(&block)
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real_start = Gitlab::Metrics::System.monotonic_time
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value = yield
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histogram.observe({}, Gitlab::Metrics::System.monotonic_time - real_start)
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value
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end
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private
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attr_reader :caller_id, :cache_identifier, :feature_category, :backing_resource
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def counter
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@counter ||= Gitlab::Metrics.counter(:redis_hit_miss_operations_total, "Hit/miss Redis cache counter")
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end
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def histogram
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@histogram ||= Gitlab::Metrics.histogram(
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:redis_cache_generation_duration_seconds,
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'Duration of Redis cache generation',
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labels,
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DEFAULT_BUCKETS
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)
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end
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def labels
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@labels ||= {
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caller_id: caller_id,
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cache_identifier: cache_identifier,
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feature_category: feature_category,
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backing_resource: backing_resource
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}
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end
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def fetch_backing_resource!(resource)
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return resource if VALID_BACKING_RESOURCES.include?(resource)
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raise "Unknown backing resource: #{resource}" if Gitlab.dev_or_test_env?
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DEFAULT_BACKING_RESOURCE
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end
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end
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end
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end
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