@Override
    public String toString() {
        return "BrokerHeartbeatReply(isCaughtUp=" + isCaughtUp +
            ", isFenced=" + isFenced +
            ", inControlledShutdown=" + inControlledShutdown +
            ", shouldShutDown = " + shouldShutDown +
            ")";
    }
True if the heartbeat reply should tell the broker that it should shut down.
metadata/src/main/java/org/apache/kafka/metadata/BrokerHeartbeatReply.java