routines

type NormalizationArg struct {
	Key               model.MpaID
	ScaleUpBehavior   *autoscalingv2.HPAScalingRules
	ScaleDownBehavior *autoscalingv2.HPAScalingRules
	MinReplicas       int32
	MaxReplicas       int32
	CurrentReplicas   int32
	DesiredReplicas   int32
}

type Recommender interface {
	// RunOnce performs one iteration of recommender duties followed by update of recommendations in MPA objects.
	RunOnce(workers int)
	// GetClusterState returns ClusterState used by Recommender
	GetClusterState() *model.ClusterState
	// GetClusterStateFeeder returns ClusterStateFeeder used by Recommender
	GetClusterStateFeeder() input.ClusterStateFeeder
	// UpdateMPAs computes recommendations and sends MPAs status updates to API Server
	UpdateMPAs(ctx context.Context)
	// MaintainCheckpoints stores current checkpoints in API Server and garbage collect old ones
	// MaintainCheckpoints writes at least minCheckpoints if there are more checkpoints to write.
	// Checkpoints are written until ctx permits or all checkpoints are written.
	MaintainCheckpoints(ctx context.Context, minCheckpoints int)
}

type RecommenderFactory struct {
	ClusterState *model.ClusterState

	ClusterStateFeeder     input.ClusterStateFeeder
	ControllerFetcher      controllerfetcher.ControllerFetcher
	CheckpointWriter       checkpoint.CheckpointWriter
	PodResourceRecommender logic.PodResourceRecommender
	MpaClient              mpa_api.MultidimPodAutoscalersGetter

	CheckpointsGCInterval time.Duration
	UseCheckpoints        bool

	// For HPA.
	EvtNamespacer                 v1core.EventsGetter
	PodInformer                   coreinformers.PodInformer
	MetricsClient                 metricsclient.MetricsClient
	ResyncPeriod                  time.Duration
	DownscaleStabilisationWindow  time.Duration
	Tolerance                     float64
	CpuInitializationPeriod       time.Duration
	DelayOfInitialReadinessStatus time.Duration
}