Integer.toHexString(System.identityHashCode(this));
    }
    
    public long getNextSequenceNumber() {
        return sequenceNumber.incrementAndGet();
    }
    
    public void updateHeartbeat() {
        this.lastHeartbeat = System.currentTimeMillis();
    }
    
    public boolean isExpired(long timeoutMs) {
        return System.currentTimeMillis() - lastHeartbeat > timeoutMs;
    }
    

            WitnessHeartbeatResponse response = rpcClient.heartbeat(request);

            if (response != null && response.isSuccess()) {
                registration.updateHeartbeat();
            } else {
                log.warn("Witness heartbeat failed for: {}", registration.getRegistrationId());
                registration.incrementHeartbeatFailures();
            }