Add direct members metric to VSD counts

Persist direct group members count on database,
this will later be used on Value Streams Dashboard.

EE: true
Changelog: added

ee/app/models/analytics/value_stream_dashboard/count.rb

@@ -14,7 +14,7 @@ class Count < ApplicationRecord
 
       validates :namespace_id, :count, :metric, :recorded_at, presence: true
 
-      enum metric: { projects: 1, issues: 2, groups: 3, merge_requests: 4, pipelines: 5 }
+      enum metric: { projects: 1, issues: 2, groups: 3, merge_requests: 4, pipelines: 5, direct_members: 6 }
 
       scope :latest_first_order, -> { order(recorded_at: :desc, id: :desc) }
       scope :for_period, ->(metric, from, to) {

ee/app/services/analytics/value_stream_dashboard/top_level_group_counter_service.rb

@@ -69,6 +69,13 @@ class TopLevelGroupCounterService
           inner_namespace_query: PROJECT_SELECT_SCOPE,
           count_batching_column: :id,
           count_scope: ->(namespace) { Ci::Pipeline.where(project_id: namespace.tmp_project_id) }
+        }.freeze,
+        direct_members: {
+          metric: ::Analytics::ValueStreamDashboard::Count.metrics[:direct_members],
+          namespace_class: Group,
+          inner_namespace_query: GROUP_SELECT_SCOPE,
+          count_batching_column: :id,
+          count_scope: ->(namespace) { GroupMember.non_invite.non_request.where(source_id: namespace.id) }
         }.freeze
       }.freeze
       # rubocop: enable CodeReuse/ActiveRecord

ee/spec/services/analytics/value_stream_dashboard/top_level_group_counter_service_spec.rb

@@ -13,15 +13,6 @@
   let_it_be(:project_in_subsubgroup) { create(:project, group: subsubgroup) }
 
   let_it_be(:issue_in_group) { create(:issue, project: project_in_group) }
-  let_it_be(:another_issue_in_group) { create(:issue, project: project_in_group) }
-  let_it_be(:issue_in_subsubgroup) { create(:issue, project: project_in_subsubgroup) }
-
-  let_it_be(:mr_in_subsubgroup1) { create(:merge_request, :unique_branches, source_project: project_in_subsubgroup) }
-  let_it_be(:mr_in_subsubgroup2) { create(:merge_request, :unique_branches, source_project: project_in_subsubgroup) }
-
-  let_it_be(:ci_pipeline1) { create(:ci_pipeline, project: project_in_group) }
-  let_it_be(:ci_pipeline2) { create(:ci_pipeline, project: project_in_group) }
-  let_it_be(:ci_pipeline3) { create(:ci_pipeline, project: project_in_group) }
 
   let_it_be(:aggregation) { create(:value_stream_dashboard_aggregation, namespace: group, last_run_at: nil) }
 
@@ -56,7 +47,10 @@
       { metric: 'pipelines', namespace_id: project_in_group.project_namespace.id, count: 3 },
       { metric: 'pipelines', namespace_id: project_in_subgroup.project_namespace.id, count: 0 },
       { metric: 'pipelines', namespace_id: another_project_in_subgroup.project_namespace.id, count: 0 },
-      { metric: 'pipelines', namespace_id: project_in_subsubgroup.project_namespace.id, count: 0 }
+      { metric: 'pipelines', namespace_id: project_in_subsubgroup.project_namespace.id, count: 0 },
+      { metric: 'direct_members', namespace_id: group.id, count: 1 },
+      { metric: 'direct_members', namespace_id: subgroup.id, count: 2 },
+      { metric: 'direct_members', namespace_id: subsubgroup.id, count: 0 }
     ]
   end
 
@@ -66,6 +60,25 @@
       .order(:namespace_id)
   end
 
+  before_all do
+    # Issues
+    create(:issue, project: project_in_group)
+    create(:issue, project: project_in_subsubgroup)
+    # Group members
+    create(:group_member, group: group)
+    create(:group_member, :access_request, group: group) # Not included
+    create(:group_member, :invited, :developer, group: group) # Not included
+    create(:group_member, group: subgroup)
+    create(:group_member, group: subgroup)
+    # Merge Requests
+    create(:merge_request, :unique_branches, source_project: project_in_subsubgroup)
+    create(:merge_request, :unique_branches, source_project: project_in_subsubgroup)
+    # Pipelines
+    create(:ci_pipeline, project: project_in_group)
+    create(:ci_pipeline, project: project_in_group)
+    create(:ci_pipeline, project: project_in_group)
+  end
+
   it 'returns successful response' do
     service_response = run_service