public long lastConnectAttemptMs(String id) {
        NodeConnectionState nodeState = this.nodeState.get(id);
        return nodeState == null ? 0 : nodeState.lastConnectAttemptMs;
    }
Get the timestamp of the latest connection attempt of a given node
@param id the connection to fetch the state for
clients/src/main/java/org/apache/kafka/clients/ClusterConnectionStates.java