watcher, err := fsnotify.NewWatcher()
	if err != nil {
		return nil, err
	}

	ret := &SecretManagerClient{
		queue:         queue.NewDelayed(queue.DelayQueueBuffer(0)),
		caClient:      caClient,
		configOptions: options,
		existingCertificateFile: security.SdsCertificateConfig{
			CertificatePath:   options.CertChainFilePath,
			PrivateKeyPath:    options.KeyFilePath,