Merge pull request #45 from kitianFresh/feature/support-cron-for-ehpa

support cron for ehpa

Author: kitianFresh

artifacts/deploy/autoscaling.crane.io_effectivehorizontalpodautoscalers.yaml

@@ -181,6 +181,43 @@ spec:
                         type: integer
                     type: object
                 type: object
+              crons:
+                description: Crons contains cron specs to use crontab to scale workloads
+                items:
+                  description: CronSpec defines the cron scale info
+                  properties:
+                    description:
+                      description: Description is the description of the cron
+                      type: string
+                    end:
+                      description: End is a crontab format, see https://en.wikipedia.org/wiki/Cron
+                        Define the cron schedule end, when it ended, EHPA will stop
+                        to trigger hpa to scale. Between the start and end, EHPA will
+                        keep replicas of the targetRef to equal to TargetReplicas,
+                        a scaling is a process rather than a instant action, make
+                        it as a final consistent system.
+                      type: string
+                    name:
+                      description: Name is the identifier of this cron scale. name
+                        must be unique in the same ehpa
+                      type: string
+                    start:
+                      description: Start is a crontab format, see https://en.wikipedia.org/wiki/Cron
+                        Define the cron schedule start, when the cron start is triggered,
+                        hpa will reconcile targetRef to scale to the TargetReplicas
+                        continuously.
+                      type: string
+                    targetReplicas:
+                      description: TargetReplicas is the target replicas when it is
+                        time to do scale between cron start and end
+                      format: int32
+                      type: integer
+                    timezone:
+                      description: TimeZone is the time zone of this cron schedule
+                        running in, default is UTC time.
+                      type: string
+                  type: object
+                type: array
               maxReplicas:
                 description: MaxReplicas is the upper limit replicas to the scale
                   target which the autoscaler can scale up to. It cannot be less that

autoscaling/v1alpha1/ehpa_types.go

@@ -7,6 +7,8 @@ import (
 	_ "k8s.io/metrics/pkg/apis/custom_metrics"
 	_ "k8s.io/metrics/pkg/apis/custom_metrics/v1beta1"
 	_ "k8s.io/metrics/pkg/apis/custom_metrics/v1beta2"
+	_ "k8s.io/metrics/pkg/apis/external_metrics"
+	_ "k8s.io/metrics/pkg/apis/external_metrics/v1beta1"
 	_ "k8s.io/metrics/pkg/apis/metrics"
 	_ "k8s.io/metrics/pkg/apis/metrics/v1beta1"
 
@@ -56,6 +58,9 @@ type EffectiveHorizontalPodAutoscalerSpec struct {
 	// If not set, the default metric will be set to 80% average CPU utilization.
 	// +optional
 	Metrics []autoscalingv2.MetricSpec `json:"metrics,omitempty"`
+	// Crons contains cron specs to use crontab to scale workloads
+	// +optional
+	Crons  []CronSpec `json:"crons,omitempty"`
 	// behavior configures the scaling behavior of the target
 	// in both Up and Down directions (scaleUp and scaleDown fields respectively).
 	// If not set, the default HPAScalingRules for scale up and scale down are used.
@@ -66,6 +71,33 @@ type EffectiveHorizontalPodAutoscalerSpec struct {
 	Prediction *Prediction `json:"prediction,omitempty"`
 }
 
+// CronSpec defines the cron scale info
+type CronSpec struct {
+	// Name is the identifier of this cron scale. name must be unique in the same ehpa
+	// +kubebuilder:validation:Type=string
+	Name 			string `json:"name,omitempty"`
+	// Description is the description of the cron
+	// +optional
+	// +kubebuilder:validation:Type=string
+	Description     string 	`json:"description,omitempty"`
+	// TimeZone is the time zone of this cron schedule running in, default is UTC time.
+	// +optional
+	// +kubebuilder:validation:Type=string
+	TimeZone		*string `json:"timezone,omitempty"`
+	// Start is a crontab format, see https://en.wikipedia.org/wiki/Cron
+	// Define the cron schedule start, when the cron start is triggered, hpa will reconcile targetRef to scale to the TargetReplicas continuously.
+	// +kubebuilder:validation:Type=string
+	Start  		string	`json:"start,omitempty"`
+	// End is a crontab format, see https://en.wikipedia.org/wiki/Cron
+	// Define the cron schedule end, when it ended, EHPA will stop to trigger hpa to scale.
+	// Between the start and end, EHPA will keep replicas of the targetRef to equal to TargetReplicas, a scaling is a process rather than a instant action, make it as a final consistent system.
+	// +kubebuilder:validation:Type=string
+	End 		string	`json:"end,omitempty"`
+	// TargetReplicas is the target replicas when it is time to do scale between cron start and end
+	// +kubebuilder:validation:Type=integer
+	TargetReplicas  int32	`json:"targetReplicas,omitempty"`
+}
+
 // Prediction defines configurations for predict resources
 type Prediction struct {
 	// PredictionWindowSeconds is the time window seconds to predict metrics in the future.