 default <code>linger.ms</code> changed from 0 to 5 in Apache Kafka 4.0 as the efficiency gains from larger batches typically result in 
                            similar or lower producer latency despite the increased linger.
                        </li>
                    </ul>
                </li>
                <li><a id="upgrade_400_notable_admin_client" href="#upgrade_400_notable_admin_client"><b>Admin client</b></a>
                    <ul>
                        <li>
                         