@Override
    public boolean equals(Object o) {
        if (o == null || getClass() != o.getClass()) return false;

        PingSession that = (PingSession) o;
        return sessionId == that.sessionId;
    }
@author Woonduk Kang(emeroad)
@author jaehong.kim
collector/src/main/java/com/navercorp/pinpoint/collector/grpc/lifecycle/PingSession.java