Add billable members count to group type

doc/api/graphql/reference/index.md

@@ -3054,6 +3054,7 @@ Autogenerated return type of GitlabSubscriptionActivate.
 | `additionalPurchasedStorageSize` | [`Float`](#float) | Additional storage purchased for the root namespace in bytes. |
 | `autoDevopsEnabled` | [`Boolean`](#boolean) | Indicates whether Auto DevOps is enabled for all projects within this group. |
 | `avatarUrl` | [`String`](#string) | Avatar URL of the group. |
+| `billableMembersCount` | [`Int`](#int) | The number of billable users in the group. |
 | `board` | [`Board`](#board) | A single board of the group. |
 | `boards` | [`BoardConnection`](#boardconnection) | Boards of the group. |
 | `codeCoverageActivities` | [`CodeCoverageActivityConnection`](#codecoverageactivityconnection) | Represents the code coverage activity for this group. |

ee/app/graphql/ee/types/group_type.rb

@@ -89,6 +89,10 @@ module EE
               null: true,
               description: 'Group statistics.',
               method: :itself
+
+        field :billable_members_count, ::GraphQL::INT_TYPE,
+              null: true,
+              description: 'The number of billable users in the group.'
       end
     end
   end

ee/changelogs/unreleased/vij-billable-count-gql.yml

+---
+title: Add billable_members_count to GraphQL Group type
+merge_request: 57712
+author:
+type: changed

ee/spec/graphql/ee/types/group_type_spec.rb

@@ -20,6 +20,7 @@ RSpec.describe GitlabSchema.types['Group'] do
   it { expect(described_class).to have_graphql_field(:vulnerability_grades) }
   it { expect(described_class).to have_graphql_field(:code_coverage_activities) }
   it { expect(described_class).to have_graphql_field(:stats) }
+  it { expect(described_class).to have_graphql_field(:billable_members_count) }
 
   describe 'timelogs field' do
     subject { described_class.fields['timelogs'] }