KeyRotationWorkersWait time.Duration `json:"keyRotationWorkersWait"`
	ExpirationWorkersWait  time.Duration `json:"expirationWorkersWait"`
}

// ExpirationWait returns the duration for which a batch expiration worker
// would wait before working on next object.
func (opts Config) ExpirationWait() time.Duration {
	configMu.RLock()
	defer configMu.RUnlock()

	return opts.ExpirationWorkersWait
}

	}

	var i int
	for toExpire := range expireCh {
		select {
		case <-ctx.Done():
			return
		default:
		}
		if i > 0 {
			if wait := globalBatchConfig.ExpirationWait(); wait > 0 {
				time.Sleep(wait)
			}
		}
		i++
		wk.Take()
		go func(toExpire []expireObjInfo) {
			defer wk.Give()

			toExpireAll := make([]ObjectInfo, 0, len(toExpire))