const (
	ActionLabelScaleUp   ActionLabel = "scale_up"
	ActionLabelScaleDown ActionLabel = "scale_down"
	ActionLabelNone      ActionLabel = "none"

	// ErrorLabelSpec represents an error due to an invalid spec of HPA object.
	ErrorLabelSpec ErrorLabel = "spec"
	// ErrorLabelInternal represents an error from an internal computation or communication with other component.
	ErrorLabelInternal ErrorLabel = "internal"
	ErrorLabelNone     ErrorLabel = "none"
)

type ActionLabel string

type ErrorLabel string

type Monitor interface {
	ObserveReconciliationResult(action ActionLabel, err ErrorLabel, duration time.Duration)
	ObserveMetricComputationResult(action ActionLabel, err ErrorLabel, duration time.Duration, metricType v2.MetricSourceType)
	ObserveHPAAddition()
	ObserveHPADeletion()
	ObserveDesiredReplicas(namespace, hpaName string, desiredReplicas int32)
}