Refactor metrics to use metrics dsl notation

lib/gitlab/metrics/method_call.rb

@@ -8,11 +8,12 @@ module Gitlab
       BASE_LABELS = { module: nil, method: nil }.freeze
       attr_reader :real_time, :cpu_time, :call_count, :labels
 
-      define_histogram :gitlab_method_call_duration_seconds,
-                       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
+      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`.

lib/gitlab/metrics/subscribers/action_view.rb

@@ -4,11 +4,12 @@ module Gitlab
       # Class for tracking the rendering timings of views.
       class ActionView < ActiveSupport::Subscriber
         include Gitlab::Metrics::Concern
-        define_histogram :gitlab_view_rendering_duration_seconds,
-                         docstring: 'View rendering time',
-                         base_labels: Transaction::BASE_LABELS.merge({ path: nil }),
-                         buckets: [0.001, 0.01, 0.1, 10.0],
-                         with_feature: :prometheus_metrics_view_instrumentation
+        define_histogram :gitlab_view_rendering_duration_seconds do
+          docstring 'View rendering time'
+          base_labels Transaction::BASE_LABELS.merge({ path: nil })
+          buckets [0.001, 0.01, 0.1, 10.0]
+          with_feature :prometheus_metrics_view_instrumentation
+        end
 
         attach_to :action_view
 

lib/gitlab/metrics/transaction.rb

@@ -137,16 +137,18 @@ module Gitlab
         "#{labels[:controller]}##{labels[:action]}" if labels && !labels.empty?
       end
 
-      define_histogram :gitlab_transaction_duration_seconds,
-                       docstring: 'Transaction duration',
-                       base_labels: BASE_LABELS,
-                       buckets: [0.001, 0.01, 0.1, 0.5, 10.0]
-
-      define_histogram :gitlab_transaction_allocated_memory_bytes,
-                       docstring: 'Transaction allocated memory bytes',
-                       base_labels: BASE_LABELS,
-                       buckets: [100, 1000, 10000, 100000, 1000000, 10000000],
-                       with_feature: :prometheus_metrics_transaction_allocated_memory
+      define_histogram :gitlab_transaction_duration_seconds do
+        docstring 'Transaction duration'
+        base_labels BASE_LABELS
+        buckets [0.001, 0.01, 0.1, 0.5, 10.0]
+      end
+
+      define_histogram :gitlab_transaction_allocated_memory_bytes do
+        docstring 'Transaction allocated memory bytes'
+        base_labels BASE_LABELS
+        buckets [100, 1000, 10000, 100000, 1000000, 10000000]
+        with_feature :prometheus_metrics_transaction_allocated_memory
+      end
 
       def self.transaction_metric(name, type, prefix: nil, tags: {})
         metric_name = "gitlab_transaction_#{prefix}#{name}_total".to_sym