Expose mentions_disabled via group GraphQL API

app/graphql/types/group_type.rb

@@ -17,6 +17,9 @@ module Types
             group.avatar_url(only_path: false)
           end
 
+    field :mentions_disabled, GraphQL::BOOLEAN_TYPE, null: true,
+          description: 'Indicates if a group is disabled from getting mentioned'
+
     field :parent, GroupType, null: true,
           description: 'Parent group',
           resolve: -> (obj, _args, _ctx) { Gitlab::Graphql::Loaders::BatchModelLoader.new(Group, obj.parent_id).find }

doc/api/graphql/reference/gitlab_schema.graphql

@@ -2594,6 +2594,11 @@ type Group {
   """
   lfsEnabled: Boolean
 
+  """
+  Indicates if a group is disabled from getting mentioned
+  """
+  mentionsDisabled: Boolean
+
   """
   Name of the namespace
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -3460,6 +3460,20 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "mentionsDisabled",
+              "description": "Indicates if a group is disabled from getting mentioned",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "SCALAR",
+                "name": "Boolean",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "name",
               "description": "Name of the namespace",

doc/api/graphql/reference/index.md

@@ -393,6 +393,7 @@ Autogenerated return type of EpicTreeReorder
 | `userPermissions` | GroupPermissions! | Permissions for the current user on the resource |
 | `webUrl` | String! | Web URL of the group |
 | `avatarUrl` | String | Avatar URL of the group |
+| `mentionsDisabled` | Boolean | Indicates if a group is disabled from getting mentioned |
 | `parent` | Group | Parent group |
 | `epicsEnabled` | Boolean | Indicates if Epics are enabled for namespace |
 | `groupTimelogsEnabled` | Boolean | Indicates if Group timelogs are enabled for namespace |

spec/graphql/types/group_type_spec.rb

@@ -8,4 +8,10 @@ describe GitlabSchema.types['Group'] do
   it { expect(described_class.graphql_name).to eq('Group') }
 
   it { expect(described_class).to require_graphql_authorizations(:read_group) }
+
+  it 'has the expected fields' do
+    expected_fields = %w[web_url avatar_url mentions_disabled parent]
+
+    is_expected.to include_graphql_fields(*expected_fields)
+  end
 end