Add setting to control the referrer origin (#34731)

app/models/form/admin_settings.rb

@@ -29,6 +29,7 @@ class Form::AdminSettings
     trendable_by_default
     show_domain_blocks
     show_domain_blocks_rationale
+    allow_referrer_origin
     noindex
     require_invite_text
     media_cache_retention_period
@@ -50,6 +51,7 @@ class Form::AdminSettings
   ).freeze
 
   BOOLEAN_KEYS = %i(
+    allow_referrer_origin
     timeline_preview
     activity_api_enabled
     peers_api_enabled

app/views/admin/settings/discovery/show.html.haml

@@ -35,6 +35,8 @@
               as: :boolean,
               wrapper: :with_label
 
+  %h4= t('admin.settings.discovery.privacy')
+
   .fields-group
     = f.input :noindex,
               as: :boolean,
@@ -42,6 +44,13 @@
               label: t('admin.settings.default_noindex.title'),
               wrapper: :with_label
 
+  .fields-group
+    = f.input :allow_referrer_origin,
+              as: :boolean,
+              hint: t('admin.settings.allow_referrer_origin.desc'),
+              label: t('admin.settings.allow_referrer_origin.title'),
+              wrapper: :with_label
+
   %h4= t('admin.settings.discovery.publish_statistics')
 
   .fields-group
@@ -50,8 +59,6 @@
               wrapper: :with_label,
               recommended: :recommended
 
-  %h4= t('admin.settings.discovery.publish_discovered_servers')
-
   .fields-group
     = f.input :peers_api_enabled,
               as: :boolean,