type ThresholdOperator string

const (
	// OpLessThan is the operator that expresses a less than operator.
	OpLessThan ThresholdOperator = "LessThan"
)

// OpForSignal maps Signals to ThresholdOperators.
// Today, the only supported operator is "LessThan". This may change in the future,
// for example if "consumed" (as opposed to "available") type signals are added.

func parseThresholdStatement(signal evictionapi.Signal, val string) (*evictionapi.Threshold, error) {
	if !validSignal(signal) {
		return nil, fmt.Errorf(unsupportedEvictionSignal, signal)
	}
	operator := evictionapi.OpForSignal[signal]
	if strings.HasSuffix(val, "%") {
		// ignore 0% and 100%
		if val == "0%" || val == "100%" {
			return nil, nil
		}
		percentage, err := parsePercentage(val)
		if err != nil {
			return nil, err