private void connect(PingSession pingSession) {
        pingSession.setLastPingTimeMillis(System.currentTimeMillis());
        lifecycleListener.connect(pingSession);
    }
@author Woonduk Kang(emeroad)
@author jaehong.kim
collector/src/main/java/com/navercorp/pinpoint/collector/grpc/lifecycle/DefaultPingEventHandler.java