2017-10-16 13:57:33 +00:00
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module Gitlab
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module Metrics
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# Class for storing metrics information of a single transaction.
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2017-10-19 09:24:15 +00:00
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class Transaction
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2017-10-17 14:06:52 +00:00
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# base labels shared among all transactions
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BASE_LABELS = { controller: nil, action: nil }.freeze
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2017-10-16 13:57:33 +00:00
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THREAD_KEY = :_gitlab_metrics_transaction
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2017-10-24 07:20:49 +00:00
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METRICS_MUTEX = Mutex.new
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2017-10-16 13:57:33 +00:00
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# The series to store events (e.g. Git pushes) in.
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EVENT_SERIES = 'events'.freeze
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attr_reader :tags, :values, :method, :metrics
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def self.current
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Thread.current[THREAD_KEY]
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end
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2017-10-17 14:06:52 +00:00
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def initialize
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2017-10-16 13:57:33 +00:00
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@metrics = []
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@methods = {}
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@started_at = nil
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@finished_at = nil
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@values = Hash.new(0)
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@tags = {}
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@memory_before = 0
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@memory_after = 0
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end
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def duration
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@finished_at ? (@finished_at - @started_at) : 0.0
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end
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2017-12-12 17:12:49 +00:00
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def duration_milliseconds
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2017-12-19 18:40:43 +00:00
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duration.in_milliseconds.to_i
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2017-12-12 17:12:49 +00:00
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end
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2017-10-16 13:57:33 +00:00
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def allocated_memory
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@memory_after - @memory_before
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end
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def run
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Thread.current[THREAD_KEY] = self
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@memory_before = System.memory_usage
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@started_at = System.monotonic_time
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yield
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ensure
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@memory_after = System.memory_usage
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@finished_at = System.monotonic_time
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2018-01-16 07:50:42 +00:00
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self.class.gitlab_transaction_duration_seconds.observe(labels, duration)
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self.class.gitlab_transaction_allocated_memory_bytes.observe(labels, allocated_memory * 1024.0)
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2017-10-16 13:57:33 +00:00
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Thread.current[THREAD_KEY] = nil
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end
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def add_metric(series, values, tags = {})
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@metrics << Metric.new("#{Metrics.series_prefix}#{series}", values, tags)
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end
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# Tracks a business level event
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#
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# Business level events including events such as Git pushes, Emails being
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# sent, etc.
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#
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# event_name - The name of the event (e.g. "git_push").
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# tags - A set of tags to attach to the event.
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def add_event(event_name, tags = {})
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2018-01-16 07:50:42 +00:00
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self.class.transaction_metric(event_name, :counter, prefix: 'event_', tags: tags).increment(tags.merge(labels))
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2017-10-16 13:57:33 +00:00
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@metrics << Metric.new(EVENT_SERIES, { count: 1 }, tags.merge(event: event_name), :event)
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end
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# Returns a MethodCall object for the given name.
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def method_call_for(name, module_name, method_name)
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unless method = @methods[name]
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@methods[name] = method = MethodCall.new(name, module_name, method_name, self)
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end
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method
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end
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def increment(name, value, use_prometheus = true)
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2018-01-16 07:50:42 +00:00
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self.class.transaction_metric(name, :counter).increment(labels, value) if use_prometheus
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2017-10-16 13:57:33 +00:00
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@values[name] += value
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end
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def set(name, value, use_prometheus = true)
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2018-01-16 07:50:42 +00:00
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self.class.transaction_metric(name, :gauge).set(labels, value) if use_prometheus
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2017-10-16 13:57:33 +00:00
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@values[name] = value
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end
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def finish
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track_self
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submit
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end
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def track_self
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2017-12-12 17:12:49 +00:00
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values = { duration: duration_milliseconds, allocated_memory: allocated_memory }
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2017-10-16 13:57:33 +00:00
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@values.each do |name, value|
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values[name] = value
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end
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add_metric('transactions', values, @tags)
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end
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def submit
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submit = @metrics.dup
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@methods.each do |name, method|
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submit << method.to_metric if method.above_threshold?
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end
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submit_hashes = submit.map do |metric|
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hash = metric.to_hash
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hash[:tags][:action] ||= action if action && !metric.event?
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hash
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end
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Metrics.submit_metrics(submit_hashes)
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end
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2017-10-17 14:06:52 +00:00
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def labels
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BASE_LABELS
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end
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# returns string describing the action performed, usually the class plus method name.
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def action
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"#{labels[:controller]}##{labels[:action]}" if labels && !labels.empty?
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end
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2018-01-16 07:50:42 +00:00
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histogram :gitlab_transaction_duration_seconds, 'Transaction duration',
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base_labels: BASE_LABELS,
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buckets: [0.001, 0.01, 0.1, 0.5, 10.0],
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with_feature: :prometheus_metrics_method_instrumentation
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2017-10-24 07:20:49 +00:00
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2018-01-16 07:50:42 +00:00
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histogram :gitlab_transaction_allocated_memory_bytes, 'Transaction allocated memory bytes',
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base_labels: BASE_LABELS,
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buckets: [100, 1000, 10000, 100000, 1000000, 10000000]
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2017-10-16 13:57:33 +00:00
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2018-01-16 07:50:42 +00:00
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def self.transaction_metric(name, type, prefix: nil, tags: {})
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return @transaction_metric[name] if @transaction_metric[name]&.has_key?(name)
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2017-10-24 07:20:49 +00:00
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METRICS_MUTEX.synchronize do
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2018-01-16 07:50:42 +00:00
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@transaction_metric ||= {}
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@transaction_metric[name] ||= if type == :counter
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Gitlab::Metrics.counter("gitlab_transaction_#{prefix}#{name}_total".to_sym,
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"Transaction #{prefix}#{name} counter", tags.merge(BASE_LABELS))
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else
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Gitlab::Metrics.gauge("gitlab_transaction_#{name}".to_sym,
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"Transaction gauge #{name} ", tags.merge(BASE_LABELS), :livesum)
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end
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2017-10-24 07:20:49 +00:00
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end
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2017-10-16 13:57:33 +00:00
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end
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end
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end
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end
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