@Override
        public String toString() {
            return "Node{" +
                "nodeId=" + nodeId +
                ", endpoints=" + endpoints +
                '}';
        }
Return the last millisecond timestamp at which this replica was known to be
caught up with the leader.
@return The value of the lastCaughtUpTime if known, empty otherwise
clients/src/main/java/org/apache/kafka/clients/admin/QuorumInfo.java