perform_across_services

# File activestorage/lib/active_storage/service/mirror_service.rb, line 84
      def perform_across_services(method, *args)
        tasks = each_service.collect do |service|
          Concurrent::Promise.execute(executor: @executor) do
            service.public_send method, *args
          end
        end
        tasks.each(&:value!)
      end