Add ee metric definitions

ee/config/metrics/counts_all/geo_nodes.yml

+name: geo_nodes
+description: Total number of sites in a Geo deployment
+value_type: integer
+product_category: disaster_recovery
+stage: enablement
+status: data_available
+default_generation: generation_1
+full_path:
+  generation_1: counts.geo_nodes
+milestone: 11.2
+group: 'group::geo'
+time_frame: all
+data_source: database
+distribution: [ee]
+tier: ['premium', 'ultimate']

ee/lib/ee/gitlab/usage/metric_definition.rb

+# frozen_string_literal: true
+
+module EE
+  module Gitlab
+    module Usage
+      module MetricDefinition
+        extend ActiveSupport::Concern
+        class_methods do
+          extend ::Gitlab::Utils::Override
+
+          override :paths
+          def paths
+            @ee_paths ||= [Rails.root.join('ee', 'config', 'metrics', '**', '*.yml')] + super
+          end
+        end
+      end
+    end
+  end
+end

lib/gitlab/usage/metric_definition.rb

@@ -82,3 +82,5 @@ module Gitlab
     end
   end
 end
+
+Gitlab::Usage::MetricDefinition.prepend_if_ee('EE::Gitlab::Usage::MetricDefinition')