@Override
    public void ping(PingSession pingSession) {
        Objects.requireNonNull(pingSession, "pingSession");
        if (pingSession.firstPing()) {
            connect(pingSession);
        } else {
            updatePing(pingSession);
        }
    }
@author Woonduk Kang(emeroad)
@author jaehong.kim
collector/src/main/java/com/navercorp/pinpoint/collector/grpc/lifecycle/DefaultPingEventHandler.java