remove build_relabeled_recipients

app/services/notification_recipient_service.rb

@@ -14,10 +14,6 @@ module NotificationRecipientService
     Builder::Default.new(*a).recipient_users
   end
 
-  def self.build_relabeled_recipients(*a)
-    Builder::Relabeled.new(*a).recipient_users
-  end
-
   def self.build_new_note_recipients(*a)
     Builder::NewNote.new(*a).recipient_users
   end
@@ -246,21 +242,6 @@ module NotificationRecipientService
       end
     end
 
-    class Relabeled < Base
-      attr_reader :target
-      attr_reader :current_user
-      attr_reader :labels
-      def initialize(target, current_user, labels:)
-        @target = target
-        @current_user = current_user
-        @labels = labels
-      end
-
-      def build!
-        add_labels_subscribers(labels: labels)
-      end
-    end
-
     class NewNote < Base
       attr_reader :note
       def initialize(note)

app/services/notification_service.rb

@@ -368,7 +368,13 @@ class NotificationService
   end
 
   def relabeled_resource_email(target, labels, current_user, method)
-    recipients = NotificationRecipientService.build_relabeled_recipients(target, current_user, labels: labels)
+    recipients = labels.flat_map { |l| l.subscribers(target.project) }
+    recipients = NotificationRecipientService.notifiable_users(
+      recipients, :subscription,
+      target: target,
+      acting_user: current_user,
+    )
+
     label_names = labels.map(&:name)
 
     recipients.each do |recipient|