if selector == "" {
		errMsg := "selector is required"
		a.eventRecorder.Event(hpa, v1.EventTypeWarning, "SelectorRequired", errMsg)
		setCondition(hpa, autoscalingv2.ScalingActive, v1.ConditionFalse, "InvalidSelector", "the HPA target's scale is missing a selector")
		return nil, fmt.Errorf(errMsg)
	}