@Override
    protected String toStringBase() {
        return super.toStringBase() + ", future=" + future + ", deadlineMs=" + deadlineMs;
    }
<em>Note</em>: the {@code deadlineMs} is the future time of expiration, <em>not</em> a timeout.
clients/src/main/java/org/apache/kafka/clients/consumer/internals/events/CompletableApplicationEvent.java