@Override
    public int hashCode() {
        return Objects.hashCode(renewalIntervalInSecs, durationInSecs, registrationTimestamp,
                                lastRenewalTimestamp, evictionTimestamp, serviceUpTimestamp);
    }
Returns the service UP timestamp represented as the number of milliseconds since the epoch.
eureka/src/main/java/com/linecorp/armeria/common/eureka/LeaseInfo.java