@Override
    public String toString() {
        return String.format(
            "KafkaStreamsAssignment{%s, %s, %s}",
            processId,
            Arrays.toString(tasks.values().toArray(new AssignedTask[0])),
            followupRebalanceDeadline
        );
    }
@return the followup rebalance deadline in epoch time, after which this KafkaStreams
client will trigger a new rebalance.
streams/src/main/java/org/apache/kafka/streams/processor/assignment/KafkaStreamsAssignment.java