transmit_subscription_confirmation

# File actioncable/lib/action_cable/channel/base.rb, line 276
        def transmit_subscription_confirmation
          unless subscription_confirmation_sent?
            logger.info "#{self.class.name} is transmitting the subscription confirmation"

            ActiveSupport::Notifications.instrument("transmit_subscription_confirmation.action_cable", channel_class: self.class.name) do
              connection.transmit identifier: @identifier, type: ActionCable::INTERNAL[:message_types][:confirmation]
              @subscription_confirmation_sent = true
            end
          end
        end