de_4_0_0">Upgrading to 4.0.0 from any version 3.3.x through 3.9.x</a> for more info.
        </li>
        <li>
            Apache Kafka 4.0 ships with a brand-new group coordinator implementation (See <a href="https://cwiki.apache.org/confluence/x/HhD1D">here</a>).
            Functionally speaking, it implements all the same APIs. There are reasonable defaults, but the behavior of the new
            group coordinator can be tuned by setting the configurations with prefix <code>group.coordinator</code>.
 