Put View instrumentation and transaction memory use behind feature

lib/gitlab/metrics/subscribers/action_view.rb

@@ -4,9 +4,11 @@ module Gitlab
       # Class for tracking the rendering timings of views.
       class ActionView < ActiveSupport::Subscriber
         include Gitlab::Metrics::Concern
-        histogram :gitlab_view_rendering_duration_seconds, 'View rendering time',
+        define_histogram :gitlab_view_rendering_duration_seconds,
+                         docstring: 'View rendering time',
                          base_labels: Transaction::BASE_LABELS.merge({ path: nil }),
-                  buckets: [0.001, 0.002, 0.005, 0.01, 0.02, 0.05, 0.1, 0.500, 2.0, 10.0]
+                         buckets: [0.001, 0.01, 0.1, 10.0],
+                         with_feature: :prometheus_metrics_view_instrumentation
 
         attach_to :action_view
 
@@ -24,7 +26,7 @@ module Gitlab
           values = values_for(event)
           tags   = tags_for(event)
 
-          gitlab_view_rendering_duration_seconds.observe(current_transaction.labels.merge(tags), event.duration)
+          self.class.gitlab_view_rendering_duration_seconds.observe(current_transaction.labels.merge(tags), event.duration)
 
           current_transaction.increment(:view_duration, event.duration)
           current_transaction.add_metric(SERIES, values, tags)

lib/gitlab/metrics/transaction.rb

@@ -140,13 +140,13 @@ module Gitlab
       define_histogram :gitlab_transaction_duration_seconds,
                        docstring: 'Transaction duration',
                        base_labels: BASE_LABELS,
-                       buckets: [0.001, 0.01, 0.1, 0.5, 10.0],
-                       with_feature: :prometheus_metrics_method_instrumentation
+                       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]
+                       buckets: [100, 1000, 10000, 100000, 1000000, 10000000],
+                       with_feature: :prometheus_metrics_transaction_allocated_memory
 
       def self.transaction_metric(name, type, prefix: nil, tags: {})
         metric_name = "gitlab_transaction_#{prefix}#{name}_total".to_sym