types.go

/*
Copyright 2018 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

// +k8s:openapi-gen=true

package v1alpha1

import (
	admregv1b "k8s.io/api/admissionregistration/v1beta1"
	v1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

// +genclient
// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object

// GeneralPodAutoscaler is the configuration for a general pod
// autoscaler, which automatically manages the replica count of any resource
// implementing the scale subresource based on the metrics specified.
type GeneralPodAutoscaler struct {
	metav1.TypeMeta `json:",inline"`
	// metadata is the standard object metadata.
	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
	// +optional
	metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`

	// spec is the specification for the behaviour of the autoscaler.
	// More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#spec-and-status.
	// +optional
	Spec GeneralPodAutoscalerSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`

	// status is the current information about the autoscaler.
	// +optional
	Status GeneralPodAutoscalerStatus `json:"status,omitempty" protobuf:"bytes,3,opt,name=status"`
}

// GeneralPodAutoscalerSpec describes the desired functionality of the GeneralPodAutoscaler.
type GeneralPodAutoscalerSpec struct {
	// DrivenMode is the mode the open autoscaling mode if we do not need scaling according to metrics.
	// including MetricMode, TimeMode, EventMode, WebhookMode
	// +optional
	AutoScalingDrivenMode `json:",inline"`

	// scaleTargetRef points to the target resource to scale, and is used to the pods for which metrics
	// should be collected, as well as to actually change the replica count.
	ScaleTargetRef CrossVersionObjectReference `json:"scaleTargetRef" protobuf:"bytes,1,opt,name=scaleTargetRef"`

	// minReplicas is the lower limit for the number of replicas to which the autoscaler
	// can scale down.  It defaults to 1 pod.  minReplicas is allowed to be 0 if the
	// alpha feature gate GPAScaleToZero is enabled and at least one Object or External
	// metric is configured.  Scaling is active as long as at least one metric value is
	// available.
	// +optional
	MinReplicas *int32 `json:"minReplicas,omitempty" protobuf:"varint,2,opt,name=minReplicas"`

	// maxReplicas is the upper limit for the number of replicas to which the autoscaler can scale up.
	// It cannot be less that minReplicas.
	MaxReplicas int32 `json:"maxReplicas" protobuf:"varint,3,opt,name=maxReplicas"`

	// behavior configures the scaling behavior of the target
	// in both Up and Down directions (scaleUp and scaleDown fields respectively).
	// If not set, the default GPAScalingRules for scale up and scale down are used.
	// +optional
	Behavior *GeneralPodAutoscalerBehavior `json:"behavior,omitempty" protobuf:"bytes,4,opt,name=behavior"`
}

// ExternalAutoScalingDrivenMode defines the mode to trigger auto scaling
type AutoScalingDrivenMode struct {
	// EventMode is the metric driven mode.
	// +optional
	MetricMode *MetricMode `json:"metric,omitempty" protobuf:"bytes,1,opt,name=metric"`

	// Webhook defines webhook mode the allow us to revive requests to scale.
	// +optional
	WebhookMode *WebhookMode `json:"webhook,omitempty" protobuf:"bytes,2,opt,name=webhook"`

	// Time defines the time driven mode, pod would auto scale to max if time reached
	// +optional
	TimeMode *TimeMode `json:"time,omitempty" protobuf:"bytes,3,opt,name=time"`

	// EventMode is the event driven mode
	// +optional
	EventMode *EventMode `json:"event,omitempty" protobuf:"bytes,4,opt,name=event"`
}

type MetricMode struct {
	// metrics contains the specifications for which to use to calculate the
	// desired replica count (the maximum replica count across all metrics will
	// be used).  The desired replica count is calculated multiplying the
	// ratio between the target value and the current value by the current
	// number of pods.  Ergo, metrics used must decrease as the pod count is
	// increased, and vice-versa.  See the individual metric source types for
	// more information about how each type of metric must respond.
	// If not set, the default metric will be set to 80% average CPU utilization.
	// +optional
	Metrics []MetricSpec `json:"metrics,omitempty" protobuf:"bytes,1,opt,name=metrics"`
}

// EventMode is the event driven mode
type EventMode struct {
	// Triggers are thr event triggers
	Triggers []ScaleTriggers `json:"triggers"`
}

// ScaleTriggers reference the scaler that will be used
type ScaleTriggers struct {
	// Type are the trigger type
	Type string `json:"type"`
	// Name is the trigger name
	// +optional
	Name string `json:"name,omitempty"`
	// Metadata contains the trigger config
	Metadata map[string]string `json:"metadata"`
}

// WebhookMode allow users to provider a server
type WebhookMode struct {
	*admregv1b.WebhookClientConfig `json:",inline"`
	// Parameters are the webhook parameters
	Parameters map[string]string `json:"parameters,omitempty" protobuf:"bytes,1,opt,name=parameters"`
}

// TimeMode is a mode allows user to define a crontab regular
type TimeMode struct {
	// TimeRanges defines a array that for time driven mode
	TimeRanges []TimeRange `json:"ranges,omitempty" protobuf:"bytes,1,opt,name=ranges"`
}

// TimeTimeRange is a mode allows user to define a crontab regular
type TimeRange struct {
	// Schedule should match crontab format
	Schedule string `json:"schedule,omitempty" protobuf:"bytes,1,opt,name=schedule"`

	// DesiredReplicas is the desired replicas required by timemode,
	DesiredReplicas int32 `json:"desiredReplicas,omitempty" protobuf:"varint,2,opt,name=desiredReplicas"`
}

// CrossVersionObjectReference contains enough information to let you identify the referred resource.
type CrossVersionObjectReference struct {
	// Kind of the referent; More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds"
	Kind string `json:"kind" protobuf:"bytes,1,opt,name=kind"`
	// Name of the referent; More info: http://kubernetes.io/docs/user-guide/identifiers#names
	Name string `json:"name" protobuf:"bytes,2,opt,name=name"`
	// API version of the referent
	// +optional
	APIVersion string `json:"apiVersion,omitempty" protobuf:"bytes,3,opt,name=apiVersion"`
}

// MetricSpec specifies how to scale based on a single metric
// (only `type` and one other matching field should be set at once).
type MetricSpec struct {
	// type is the type of metric source.  It should be one of "Object",
	// "Pods" or "Resource", each mapping to a matching field in the object.
	Type MetricSourceType `json:"type" protobuf:"bytes,1,name=type"`

	// object refers to a metric describing a single kubernetes object
	// (for example, hits-per-second on an Ingress object).
	// +optional
	Object *ObjectMetricSource `json:"object,omitempty" protobuf:"bytes,2,opt,name=object"`
	// pods refers to a metric describing each pod in the current scale target
	// (for example, transactions-processed-per-second).  The values will be
	// averaged together before being compared to the target value.
	// +optional
	Pods *PodsMetricSource `json:"pods,omitempty" protobuf:"bytes,3,opt,name=pods"`
	// resource refers to a resource metric (such as those specified in
	// requests and limits) known to Kubernetes describing each pod in the
	// current scale target (e.g. CPU or memory). Such metrics are built in to
	// Kubernetes, and have special scaling options on top of those available
	// to normal per-pod metrics using the "pods" source.
	// +optional
	Resource *ResourceMetricSource `json:"resource,omitempty" protobuf:"bytes,4,opt,name=resource"`
	// external refers to a global metric that is not associated
	// with any Kubernetes object. It allows autoscaling based on information
	// coming from components running outside of cluster
	// (for example length of queue in cloud messaging service, or
	// QPS from loadbalancer running outside of cluster).
	// +optional
	External *ExternalMetricSource `json:"external,omitempty" protobuf:"bytes,5,opt,name=external"`
	// container resource refers to a resource metric (such as those specified in
	// requests and limits) known to Kubernetes describing a single container in
	// each pod of the current scale target (e.g. CPU or memory). Such metrics are
	// built in to Kubernetes, and have special scaling options on top of those
	// available to normal per-pod metrics using the "pods" source.
	// This is an alpha feature and can be enabled by the HPAContainerMetrics feature flag.
	// +optional
	ContainerResource *ContainerResourceMetricSource `json:"containerResource,omitempty" protobuf:"bytes,6,opt,name=containerResource"`
}

// GeneralPodAutoscalerBehavior configures the scaling behavior of the target
// in both Up and Down directions (scaleUp and scaleDown fields respectively).
type GeneralPodAutoscalerBehavior struct {
	// scaleUp is scaling policy for scaling Up.
	// If not set, the default value is the higher of:
	//   * increase no more than 4 pods per 60 seconds
	//   * double the number of pods per 60 seconds
	// No stabilization is used.
	// +optional
	ScaleUp *GPAScalingRules `json:"scaleUp,omitempty" protobuf:"bytes,1,opt,name=scaleUp"`
	// scaleDown is scaling policy for scaling Down.
	// If not set, the default value is to allow to scale down to minReplicas pods, with a
	// 300 second stabilization window (i.e., the highest recommendation for
	// the last 300sec is used).
	// +optional
	ScaleDown *GPAScalingRules `json:"scaleDown,omitempty" protobuf:"bytes,2,opt,name=scaleDown"`
}

// ScalingPolicySelect is used to specify which policy should be used while scaling in a certain direction
type ScalingPolicySelect string

const (
	// MaxPolicySelect selects the policy with the highest possible change.
	MaxPolicySelect ScalingPolicySelect = "Max"
	// MinPolicySelect selects the policy with the lowest possible change.
	MinPolicySelect ScalingPolicySelect = "Min"
	// DisabledPolicySelect disables the scaling in this direction.
	DisabledPolicySelect ScalingPolicySelect = "Disabled"
)

// GPAScalingRules configures the scaling behavior for one direction.
// These Rules are applied after calculating DesiredReplicas from metrics for the GPA.
// They can limit the scaling velocity by specifying scaling policies.
// They can prevent flapping by specifying the stabilization window, so that the
// number of replicas is not set instantly, instead, the safest value from the stabilization
// window is chosen.
type GPAScalingRules struct {
	// StabilizationWindowSeconds is the number of seconds for which past recommendations should be
	// considered while scaling up or scaling down.
	// StabilizationWindowSeconds must be greater than or equal to zero and less than or equal to 3600 (one hour).
	// If not set, use the default values:
	// - For scale up: 0 (i.e. no stabilization is done).
	// - For scale down: 300 (i.e. the stabilization window is 300 seconds long).
	// +optional
	StabilizationWindowSeconds *int32 `json:"stabilizationWindowSeconds" protobuf:"varint,3,opt,name=stabilizationWindowSeconds"`
	// selectPolicy is used to specify which policy should be used.
	// If not set, the default value MaxPolicySelect is used.
	// +optional
	SelectPolicy *ScalingPolicySelect `json:"selectPolicy,omitempty" protobuf:"bytes,1,opt,name=selectPolicy"`
	// policies is a list of potential scaling polices which can be used during scaling.
	// At least one policy must be specified, otherwise the GPAScalingRules will be discarded as invalid
	// +optional
	Policies []GPAScalingPolicy `json:"policies,omitempty" protobuf:"bytes,2,rep,name=policies"`
}

// GPAScalingPolicyType is the type of the policy which could be used while making scaling decisions.
type GPAScalingPolicyType string

const (
	// PodsScalingPolicy is a policy used to specify a change in absolute number of pods.
	PodsScalingPolicy GPAScalingPolicyType = "Pods"
	// PercentScalingPolicy is a policy used to specify a relative amount of change with respect to
	// the current number of pods.
	PercentScalingPolicy GPAScalingPolicyType = "Percent"
)

// GPAScalingPolicy is a single policy which must hold true for a specified past interval.
type GPAScalingPolicy struct {
	// Type is used to specify the scaling policy.
	Type GPAScalingPolicyType `json:"type" protobuf:"bytes,1,opt,name=type,casttype=GPAScalingPolicyType"`
	// Value contains the amount of change which is permitted by the policy.
	// It must be greater than zero
	Value int32 `json:"value" protobuf:"varint,2,opt,name=value"`
	// PeriodSeconds specifies the window of time for which the policy should hold true.
	// PeriodSeconds must be greater than zero and less than or equal to 1800 (30 min).
	PeriodSeconds int32 `json:"periodSeconds" protobuf:"varint,3,opt,name=periodSeconds"`
}

// MetricSourceType indicates the type of metric.
type MetricSourceType string

const (
	// ObjectMetricSourceType is a metric describing a kubernetes object
	// (for example, hits-per-second on an Ingress object).
	ObjectMetricSourceType MetricSourceType = "Object"
	// PodsMetricSourceType is a metric describing each pod in the current scale
	// target (for example, transactions-processed-per-second).  The values
	// will be averaged together before being compared to the target value.
	PodsMetricSourceType MetricSourceType = "Pods"
	// ResourceMetricSourceType is a resource metric known to Kubernetes, as
	// specified in requests and limits, describing each pod in the current
	// scale target (e.g. CPU or memory).  Such metrics are built in to
	// Kubernetes, and have special scaling options on top of those available
	// to normal per-pod metrics (the "pods" source).
	ResourceMetricSourceType MetricSourceType = "Resource"
	// ContainerResourceMetricSourceType is a resource metric known to Kubernetes, as
	// specified in requests and limits, describing a single container in each pod in the current
	// scale target (e.g. CPU or memory).  Such metrics are built in to
	// Kubernetes, and have special scaling options on top of those available
	// to normal per-pod metrics (the "pods" source).
	ContainerResourceMetricSourceType MetricSourceType = "ContainerResource"
	// ExternalMetricSourceType is a global metric that is not associated
	// with any Kubernetes object. It allows autoscaling based on information
	// coming from components running outside of cluster
	// (for example length of queue in cloud messaging service, or
	// QPS from loadbalancer running outside of cluster).
	ExternalMetricSourceType MetricSourceType = "External"
)

// ObjectMetricSource indicates how to scale on a metric describing a
// kubernetes object (for example, hits-per-second on an Ingress object).
type ObjectMetricSource struct {
	DescribedObject CrossVersionObjectReference `json:"describedObject" protobuf:"bytes,1,name=describedObject"`
	// target specifies the target value for the given metric
	Target MetricTarget `json:"target" protobuf:"bytes,2,name=target"`
	// metric identifies the target metric by name and selector
	Metric MetricIdentifier `json:"metric" protobuf:"bytes,3,name=metric"`
}

// PodsMetricSource indicates how to scale on a metric describing each pod in
// the current scale target (for example, transactions-processed-per-second).
// The values will be averaged together before being compared to the target
// value.
type PodsMetricSource struct {
	// metric identifies the target metric by name and selector
	Metric MetricIdentifier `json:"metric" protobuf:"bytes,1,name=metric"`
	// target specifies the target value for the given metric
	Target MetricTarget `json:"target" protobuf:"bytes,2,name=target"`
}

// ResourceMetricSource indicates how to scale on a resource metric known to
// Kubernetes, as specified in requests and limits, describing each pod in the
// current scale target (e.g. CPU or memory).  The values will be averaged
// together before being compared to the target.  Such metrics are built in to
// Kubernetes, and have special scaling options on top of those available to
// normal per-pod metrics using the "pods" source.  Only one "target" type
// should be set.
type ResourceMetricSource struct {
	// name is the name of the resource in question.
	Name v1.ResourceName `json:"name" protobuf:"bytes,1,name=name"`
	// target specifies the target value for the given metric
	Target MetricTarget `json:"target" protobuf:"bytes,2,name=target"`
}

// ContainerResourceMetricSource indicates how to scale on a resource metric known to
// Kubernetes, as specified in requests and limits, describing each pod in the
// current scale target (e.g. CPU or memory).  The values will be averaged
// together before being compared to the target.  Such metrics are built in to
// Kubernetes, and have special scaling options on top of those available to
// normal per-pod metrics using the "pods" source.  Only one "target" type
// should be set.
type ContainerResourceMetricSource struct {
	// name is the name of the resource in question.
	Name v1.ResourceName `json:"name" protobuf:"bytes,1,name=name"`
	// target specifies the target value for the given metric
	Target MetricTarget `json:"target" protobuf:"bytes,2,name=target"`
	// container is the name of the container in the pods of the scaling target
	Container string `json:"container" protobuf:"bytes,3,opt,name=container"`
}

// ExternalMetricSource indicates how to scale on a metric not associated with
// any Kubernetes object (for example length of queue in cloud
// messaging service, or QPS from loadbalancer running outside of cluster).
type ExternalMetricSource struct {
	// metric identifies the target metric by name and selector
	Metric MetricIdentifier `json:"metric" protobuf:"bytes,1,name=metric"`
	// target specifies the target value for the given metric
	Target MetricTarget `json:"target" protobuf:"bytes,2,name=target"`
}

// MetricIdentifier defines the name and optionally selector for a metric
type MetricIdentifier struct {
	// name is the name of the given metric
	Name string `json:"name" protobuf:"bytes,1,name=name"`
	// selector is the string-encoded form of a standard kubernetes label selector for the given metric
	// When set, it is passed as an additional parameter to the metrics server for more specific metrics scoping.
	// When unset, just the metricName will be used to gather metrics.
	// +optional
	Selector *metav1.LabelSelector `json:"selector,omitempty" protobuf:"bytes,2,name=selector"`
}

// MetricTarget defines the target value, average value, or average utilization of a specific metric
type MetricTarget struct {
	// type represents whether the metric type is Utilization, Value, or AverageValue
	Type MetricTargetType `json:"type" protobuf:"bytes,1,name=type"`
	// value is the target value of the metric (as a quantity).
	// +optional
	Value *resource.Quantity `json:"value,omitempty" protobuf:"bytes,2,opt,name=value"`
	// averageValue is the target value of the average of the
	// metric across all relevant pods (as a quantity)
	// +optional
	AverageValue *resource.Quantity `json:"averageValue,omitempty" protobuf:"bytes,3,opt,name=averageValue"`
	// averageUtilization is the target value of the average of the
	// resource metric across all relevant pods, represented as a percentage of
	// the requested value of the resource for the pods.
	// Currently only valid for Resource metric source type
	// +optional
	AverageUtilization *int32 `json:"averageUtilization,omitempty" protobuf:"bytes,4,opt,name=averageUtilization"`
}

// MetricTargetType specifies the type of metric being targeted, and should be either
// "Value", "AverageValue", or "Utilization"
type MetricTargetType string

const (
	// UtilizationMetricType declares a MetricTarget is an AverageUtilization value
	UtilizationMetricType MetricTargetType = "Utilization"
	// ValueMetricType declares a MetricTarget is a raw value
	ValueMetricType MetricTargetType = "Value"
	// AverageValueMetricType declares a MetricTarget is an
	AverageValueMetricType MetricTargetType = "AverageValue"
)

// GeneralPodAutoscalerStatus describes the current status of a general pod autoscaler.
type GeneralPodAutoscalerStatus struct {
	// observedGeneration is the most recent generation observed by this autoscaler.
	// +optional
	ObservedGeneration *int64 `json:"observedGeneration,omitempty" protobuf:"varint,1,opt,name=observedGeneration"`

	// lastScaleTime is the last time the GeneralPodAutoscaler scaled the number of pods,
	// used by the autoscaler to control how often the number of pods is changed.
	// +optional
	LastScaleTime *metav1.Time `json:"lastScaleTime,omitempty" protobuf:"bytes,2,opt,name=lastScaleTime"`

	// currentReplicas is current number of replicas of pods managed by this autoscaler,
	// as last seen by the autoscaler.
	CurrentReplicas int32 `json:"currentReplicas" protobuf:"varint,3,opt,name=currentReplicas"`

	// desiredReplicas is the desired number of replicas of pods managed by this autoscaler,
	// as last calculated by the autoscaler.
	DesiredReplicas int32 `json:"desiredReplicas" protobuf:"varint,4,opt,name=desiredReplicas"`

	// currentMetrics is the last read state of the metrics used by this autoscaler.
	// +optional
	CurrentMetrics []MetricStatus `json:"currentMetrics" protobuf:"bytes,5,rep,name=currentMetrics"`

	// conditions is the set of conditions required for this autoscaler to scale its target,
	// and indicates whether or not those conditions are met.
	Conditions []GeneralPodAutoscalerCondition `json:"conditions" protobuf:"bytes,6,rep,name=conditions"`

	// LastCronScheduleTime is the schedule time of time mode
	LastCronScheduleTime *metav1.Time `json:"lastCronScheduleTime" protobuf:"bytes,7,rep,name=lastCronScheduleTime"`
}

// GeneralPodAutoscalerConditionType are the valid conditions of
// a GeneralPodAutoscaler.
type GeneralPodAutoscalerConditionType string

const (
	// ScalingActive indicates that the GPA controller is able to scale if necessary:
	// it's correctly configured, can fetch the desired metrics, and isn't disabled.
	ScalingActive GeneralPodAutoscalerConditionType = "ScalingActive"
	// AbleToScale indicates a lack of transient issues which prevent scaling from occurring,
	// such as being in a backoff window, or being unable to access/update the target scale.
	AbleToScale GeneralPodAutoscalerConditionType = "AbleToScale"
	// ScalingLimited indicates that the calculated scale based on metrics would be above or
	// below the range for the GPA, and has thus been capped.
	ScalingLimited GeneralPodAutoscalerConditionType = "ScalingLimited"
)

// GeneralPodAutoscalerCondition describes the state of
// a GeneralPodAutoscaler at a certain point.
type GeneralPodAutoscalerCondition struct {
	// type describes the current condition
	Type GeneralPodAutoscalerConditionType `json:"type" protobuf:"bytes,1,name=type"`
	// status is the status of the condition (True, False, Unknown)
	Status v1.ConditionStatus `json:"status" protobuf:"bytes,2,name=status"`
	// lastTransitionTime is the last time the condition transitioned from
	// one status to another
	// +optional
	LastTransitionTime metav1.Time `json:"lastTransitionTime,omitempty" protobuf:"bytes,3,opt,name=lastTransitionTime"`
	// reason is the reason for the condition's last transition.
	// +optional
	Reason string `json:"reason,omitempty" protobuf:"bytes,4,opt,name=reason"`
	// message is a human-readable explanation containing details about
	// the transition
	// +optional
	Message string `json:"message,omitempty" protobuf:"bytes,5,opt,name=message"`
}

// MetricStatus describes the last-read state of a single metric.
type MetricStatus struct {
	// type is the type of metric source.  It will be one of "Object",
	// "Pods" or "Resource", each corresponds to a matching field in the object.
	Type MetricSourceType `json:"type" protobuf:"bytes,1,name=type"`

	// object refers to a metric describing a single kubernetes object
	// (for example, hits-per-second on an Ingress object).
	// +optional
	Object *ObjectMetricStatus `json:"object,omitempty" protobuf:"bytes,2,opt,name=object"`
	// pods refers to a metric describing each pod in the current scale target
	// (for example, transactions-processed-per-second).  The values will be
	// averaged together before being compared to the target value.
	// +optional
	Pods *PodsMetricStatus `json:"pods,omitempty" protobuf:"bytes,3,opt,name=pods"`
	// resource refers to a resource metric (such as those specified in
	// requests and limits) known to Kubernetes describing each pod in the
	// current scale target (e.g. CPU or memory). Such metrics are built in to
	// Kubernetes, and have special scaling options on top of those available
	// to normal per-pod metrics using the "pods" source.
	// +optional
	Resource *ResourceMetricStatus `json:"resource,omitempty" protobuf:"bytes,4,opt,name=resource"`
	// external refers to a global metric that is not associated
	// with any Kubernetes object. It allows autoscaling based on information
	// coming from components running outside of cluster
	// (for example length of queue in cloud messaging service, or
	// QPS from loadbalancer running outside of cluster).
	// +optional
	External *ExternalMetricStatus `json:"external,omitempty" protobuf:"bytes,5,opt,name=external"`
	// to normal per-pod metrics using the "pods" source.
	// +optional
	ContainerResource *ContainerResourceMetricStatus `json:"containerResource,omitempty" protobuf:"bytes,6,opt,name=containerResource"`
}

// ObjectMetricStatus indicates the current value of a metric describing a
// kubernetes object (for example, hits-per-second on an Ingress object).
type ObjectMetricStatus struct {
	// metric identifies the target metric by name and selector
	Metric MetricIdentifier `json:"metric" protobuf:"bytes,1,name=metric"`
	// current contains the current value for the given metric
	Current MetricValueStatus `json:"current" protobuf:"bytes,2,name=current"`

	DescribedObject CrossVersionObjectReference `json:"describedObject" protobuf:"bytes,3,name=describedObject"`
}

// PodsMetricStatus indicates the current value of a metric describing each pod in
// the current scale target (for example, transactions-processed-per-second).
type PodsMetricStatus struct {
	// metric identifies the target metric by name and selector
	Metric MetricIdentifier `json:"metric" protobuf:"bytes,1,name=metric"`
	// current contains the current value for the given metric
	Current MetricValueStatus `json:"current" protobuf:"bytes,2,name=current"`
}

// ResourceMetricStatus indicates the current value of a resource metric known to
// Kubernetes, as specified in requests and limits, describing each pod in the
// current scale target (e.g. CPU or memory).  Such metrics are built in to
// Kubernetes, and have special scaling options on top of those available to
// normal per-pod metrics using the "pods" source.
type ResourceMetricStatus struct {
	// Name is the name of the resource in question.
	Name v1.ResourceName `json:"name" protobuf:"bytes,1,name=name"`
	// current contains the current value for the given metric
	Current MetricValueStatus `json:"current" protobuf:"bytes,2,name=current"`
}

// container resource refers to a resource metric (such as those specified in
// requests and limits) known to Kubernetes describing a single container in each pod in the
// current scale target (e.g. CPU or memory). Such metrics are built in to
// Kubernetes, and have special scaling options on top of those available
// to normal per-pod metrics using the "pods" source.
// +optional
type ContainerResourceMetricStatus struct {
	// Name is the name of the resource in question.
	Name v1.ResourceName `json:"name" protobuf:"bytes,1,name=name"`
	// current contains the current value for the given metric
	Current MetricValueStatus `json:"current" protobuf:"bytes,2,name=current"`
	// Container is the name of the container in the pods of the scaling target
	Container string `json:"container" protobuf:"bytes,3,opt,name=container"`
}

// ExternalMetricStatus indicates the current value of a global metric
// not associated with any Kubernetes object.
type ExternalMetricStatus struct {
	// metric identifies the target metric by name and selector
	Metric MetricIdentifier `json:"metric" protobuf:"bytes,1,name=metric"`
	// current contains the current value for the given metric
	Current MetricValueStatus `json:"current" protobuf:"bytes,2,name=current"`
}

// MetricValueStatus holds the current value for a metric
type MetricValueStatus struct {
	// value is the current value of the metric (as a quantity).
	// +optional
	Value *resource.Quantity `json:"value,omitempty" protobuf:"bytes,1,opt,name=value"`
	// averageValue is the current value of the average of the
	// metric across all relevant pods (as a quantity)
	// +optional
	AverageValue *resource.Quantity `json:"averageValue,omitempty" protobuf:"bytes,2,opt,name=averageValue"`
	// currentAverageUtilization is the current value of the average of the
	// resource metric across all relevant pods, represented as a percentage of
	// the requested value of the resource for the pods.
	// +optional
	AverageUtilization *int32 `json:"averageUtilization,omitempty" protobuf:"bytes,3,opt,name=averageUtilization"`
}

// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
// +k8s:prerelease-lifecycle-gen:introduced=1.12
// +k8s:prerelease-lifecycle-gen:deprecated=1.22

// GeneralPodAutoscalerList is a list of general pod autoscaler objects.
type GeneralPodAutoscalerList struct {
	metav1.TypeMeta `json:",inline"`
	// metadata is the standard list metadata.
	// +optional
	metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`

	// items is the list of general pod autoscaler objects.
	Items []GeneralPodAutoscaler `json:"items" protobuf:"bytes,2,rep,name=items"`
}