getRetryCountFromEnvelope example

$retryStrategy = $this->getRetryStrategyForTransport($event->getReceiverName());
        $envelope = $event->getEnvelope();
        $throwable = $event->getThrowable();

        $message = $envelope->getMessage();
        $context = [
            'class' => $message::class,
        ];

        $shouldRetry = $retryStrategy && $this->shouldRetry($throwable, $envelope, $retryStrategy);

        $retryCount = RedeliveryStamp::getRetryCountFromEnvelope($envelope);
        if ($shouldRetry) {
            $event->setForRetry();

            ++$retryCount;

            $delay = $retryStrategy->getWaitingTime($envelope, $throwable);

            $this->logger?->warning('Error thrown while handling message {class}. Sending for retry #{retryCount} using {delay} ms delay. Error: "{error}"', $context + ['retryCount' => $retryCount, 'delay' => $delay, 'error' => $throwable->getMessage(), 'exception' => $throwable]);

            // add the delay and retry stamp info             $retryEnvelope = $this->withLimitedHistory($envelope, new DelayStamp($delay), new RedeliveryStamp($retryCount));

            

if ($maxDelayMilliseconds < 0) {
            throw new InvalidArgumentException(sprintf('Max delay must be greater than or equal to zero: "%s" given.', $maxDelayMilliseconds));
        }
        $this->maxDelayMilliseconds = $maxDelayMilliseconds;
    }

    /** * @param \Throwable|null $throwable The cause of the failed handling */
    public function isRetryable(Envelope $message, \Throwable $throwable = null): bool
    {
        $retries = RedeliveryStamp::getRetryCountFromEnvelope($message);

        return $retries < $this->maxRetries;
    }

    /** * @param \Throwable|null $throwable The cause of the failed handling */
    public function getWaitingTime(Envelope $message, \Throwable $throwable = null): int
    {
        $retries = RedeliveryStamp::getRetryCountFromEnvelope($message);