if err == nil && len(metadata.GetResourceVersion()) > 0 {
			prevUsage, innerErr := evaluator.Usage(prevItem)
			if innerErr != nil {
				return quotas, innerErr
			}
			deltaUsage = quota.SubtractWithNonNegativeResult(deltaUsage, prevUsage)
		}
	}

	// ignore items in deltaUsage with zero usage
	deltaUsage = quota.RemoveZeros(deltaUsage)
	// if there is no remaining non-zero usage, short-circuit and return