This doc not talk about consumer tag. But the method of consumer,has the third param for consumer tag.
If you want to set the consumer tag,see the example.
$consume_tag = sprintf("%s_%s_%s", php_uname('n'), time(), getmypid());
$queue->consume($callback, \AMQP_NOPARAM, $consume_tag)
public function consume(
callable $callback = null,
$flags = AMQP_NOPARAM,
$consumerTag = null
) {}