module Gitlab module Metrics # Class for tracking timing information about method calls class MethodCall include Gitlab::Metrics::Methods BASE_LABELS = { module: nil, method: nil }.freeze attr_reader :real_time, :cpu_time, :call_count, :labels define_histogram :gitlab_method_call_duration_seconds do docstring 'Method calls real duration' base_labels Transaction::BASE_LABELS.merge(BASE_LABELS) buckets [0.01, 0.05, 0.1, 0.5, 1] with_feature :prometheus_metrics_method_instrumentation end # name - The full name of the method (including namespace) such as # `User#sign_in`. # def initialize(name, module_name, method_name, transaction) @module_name = module_name @method_name = method_name @transaction = transaction @name = name @labels = { module: @module_name, method: @method_name } @real_time = 0.0 @cpu_time = 0.0 @call_count = 0 end # Measures the real and CPU execution time of the supplied block. def measure start_real = System.monotonic_time start_cpu = System.cpu_time retval = yield real_time = System.monotonic_time - start_real cpu_time = System.cpu_time - start_cpu @real_time += real_time @cpu_time += cpu_time @call_count += 1 if above_threshold? self.class.gitlab_method_call_duration_seconds.observe(@transaction.labels.merge(labels), real_time) end retval end # Returns a Metric instance of the current method call. def to_metric Metric.new( Instrumentation.series, { duration: real_time.in_milliseconds.to_i, cpu_duration: cpu_time.in_milliseconds.to_i, call_count: call_count }, method: @name ) end # Returns true if the total runtime of this method exceeds the method call # threshold. def above_threshold? real_time.in_milliseconds >= Metrics.method_call_threshold end end end end