Merge branch 'fix_copy_active_methods' into 'master'

Fix auto-loading of Gitlab::Metrics::Methods

See merge request gitlab-org/gitlab!53798

lib/gitlab/metrics/methods.rb

@@ -39,7 +39,7 @@ module Gitlab
           options.evaluate(&block)
 
           if disabled_by_feature(options)
-            synchronized_cache_fill(name) { NullMetric.instance }
+            synchronized_cache_fill(name) { ::Gitlab::Metrics::NullMetric.instance }
           else
             synchronized_cache_fill(name) { build_metric!(type, name, options) }
           end