2 Copyright 2016 The Kubernetes Authors.
4 Licensed under the Apache License, Version 2.0 (the "License");
5 you may not use this file except in compliance with the License.
6 You may obtain a copy of the License at
8 http://www.apache.org/licenses/LICENSE-2.0
10 Unless required by applicable law or agreed to in writing, software
11 distributed under the License is distributed on an "AS IS" BASIS,
12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 See the License for the specific language governing permissions and
14 limitations under the License.
21 "k8s.io/apimachinery/pkg/api/resource"
22 metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
25 // CrossVersionObjectReference contains enough information to let you identify the referred resource.
26 type CrossVersionObjectReference struct {
27 // Kind of the referent; More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#types-kinds"
28 Kind string `json:"kind" protobuf:"bytes,1,opt,name=kind"`
29 // Name of the referent; More info: http://kubernetes.io/docs/user-guide/identifiers#names
30 Name string `json:"name" protobuf:"bytes,2,opt,name=name"`
31 // API version of the referent
33 APIVersion string `json:"apiVersion,omitempty" protobuf:"bytes,3,opt,name=apiVersion"`
36 // HorizontalPodAutoscalerSpec describes the desired functionality of the HorizontalPodAutoscaler.
37 type HorizontalPodAutoscalerSpec struct {
38 // scaleTargetRef points to the target resource to scale, and is used to the pods for which metrics
39 // should be collected, as well as to actually change the replica count.
40 ScaleTargetRef CrossVersionObjectReference `json:"scaleTargetRef" protobuf:"bytes,1,opt,name=scaleTargetRef"`
41 // minReplicas is the lower limit for the number of replicas to which the autoscaler can scale down.
42 // It defaults to 1 pod.
44 MinReplicas *int32 `json:"minReplicas,omitempty" protobuf:"varint,2,opt,name=minReplicas"`
45 // maxReplicas is the upper limit for the number of replicas to which the autoscaler can scale up.
46 // It cannot be less that minReplicas.
47 MaxReplicas int32 `json:"maxReplicas" protobuf:"varint,3,opt,name=maxReplicas"`
48 // metrics contains the specifications for which to use to calculate the
49 // desired replica count (the maximum replica count across all metrics will
50 // be used). The desired replica count is calculated multiplying the
51 // ratio between the target value and the current value by the current
52 // number of pods. Ergo, metrics used must decrease as the pod count is
53 // increased, and vice-versa. See the individual metric source types for
54 // more information about how each type of metric must respond.
56 Metrics []MetricSpec `json:"metrics,omitempty" protobuf:"bytes,4,rep,name=metrics"`
59 // MetricSourceType indicates the type of metric.
60 type MetricSourceType string
63 // ObjectMetricSourceType is a metric describing a kubernetes object
64 // (for example, hits-per-second on an Ingress object).
65 ObjectMetricSourceType MetricSourceType = "Object"
66 // PodsMetricSourceType is a metric describing each pod in the current scale
67 // target (for example, transactions-processed-per-second). The values
68 // will be averaged together before being compared to the target value.
69 PodsMetricSourceType MetricSourceType = "Pods"
70 // ResourceMetricSourceType is a resource metric known to Kubernetes, as
71 // specified in requests and limits, describing each pod in the current
72 // scale target (e.g. CPU or memory). Such metrics are built in to
73 // Kubernetes, and have special scaling options on top of those available
74 // to normal per-pod metrics (the "pods" source).
75 ResourceMetricSourceType MetricSourceType = "Resource"
76 // ExternalMetricSourceType is a global metric that is not associated
77 // with any Kubernetes object. It allows autoscaling based on information
78 // coming from components running outside of cluster
79 // (for example length of queue in cloud messaging service, or
80 // QPS from loadbalancer running outside of cluster).
81 ExternalMetricSourceType MetricSourceType = "External"
84 // MetricSpec specifies how to scale based on a single metric
85 // (only `type` and one other matching field should be set at once).
86 type MetricSpec struct {
87 // type is the type of metric source. It should be one of "Object",
88 // "Pods" or "Resource", each mapping to a matching field in the object.
89 Type MetricSourceType `json:"type" protobuf:"bytes,1,name=type"`
91 // object refers to a metric describing a single kubernetes object
92 // (for example, hits-per-second on an Ingress object).
94 Object *ObjectMetricSource `json:"object,omitempty" protobuf:"bytes,2,opt,name=object"`
95 // pods refers to a metric describing each pod in the current scale target
96 // (for example, transactions-processed-per-second). The values will be
97 // averaged together before being compared to the target value.
99 Pods *PodsMetricSource `json:"pods,omitempty" protobuf:"bytes,3,opt,name=pods"`
100 // resource refers to a resource metric (such as those specified in
101 // requests and limits) known to Kubernetes describing each pod in the
102 // current scale target (e.g. CPU or memory). Such metrics are built in to
103 // Kubernetes, and have special scaling options on top of those available
104 // to normal per-pod metrics using the "pods" source.
106 Resource *ResourceMetricSource `json:"resource,omitempty" protobuf:"bytes,4,opt,name=resource"`
107 // external refers to a global metric that is not associated
108 // with any Kubernetes object. It allows autoscaling based on information
109 // coming from components running outside of cluster
110 // (for example length of queue in cloud messaging service, or
111 // QPS from loadbalancer running outside of cluster).
113 External *ExternalMetricSource `json:"external,omitempty" protobuf:"bytes,5,opt,name=external"`
116 // ObjectMetricSource indicates how to scale on a metric describing a
117 // kubernetes object (for example, hits-per-second on an Ingress object).
118 type ObjectMetricSource struct {
119 // target is the described Kubernetes object.
120 Target CrossVersionObjectReference `json:"target" protobuf:"bytes,1,name=target"`
122 // metricName is the name of the metric in question.
123 MetricName string `json:"metricName" protobuf:"bytes,2,name=metricName"`
124 // targetValue is the target value of the metric (as a quantity).
125 TargetValue resource.Quantity `json:"targetValue" protobuf:"bytes,3,name=targetValue"`
127 // selector is the string-encoded form of a standard kubernetes label selector for the given metric
128 // When set, it is passed as an additional parameter to the metrics server for more specific metrics scoping
129 // When unset, just the metricName will be used to gather metrics.
131 Selector *metav1.LabelSelector `json:"selector,omitempty" protobuf:"bytes,4,name=selector"`
132 // averageValue is the target value of the average of the
133 // metric across all relevant pods (as a quantity)
135 AverageValue *resource.Quantity `json:"averageValue,omitempty" protobuf:"bytes,5,name=averageValue"`
138 // PodsMetricSource indicates how to scale on a metric describing each pod in
139 // the current scale target (for example, transactions-processed-per-second).
140 // The values will be averaged together before being compared to the target
142 type PodsMetricSource struct {
143 // metricName is the name of the metric in question
144 MetricName string `json:"metricName" protobuf:"bytes,1,name=metricName"`
145 // targetAverageValue is the target value of the average of the
146 // metric across all relevant pods (as a quantity)
147 TargetAverageValue resource.Quantity `json:"targetAverageValue" protobuf:"bytes,2,name=targetAverageValue"`
149 // selector is the string-encoded form of a standard kubernetes label selector for the given metric
150 // When set, it is passed as an additional parameter to the metrics server for more specific metrics scoping
151 // When unset, just the metricName will be used to gather metrics.
153 Selector *metav1.LabelSelector `json:"selector,omitempty" protobuf:"bytes,3,name=selector"`
156 // ResourceMetricSource indicates how to scale on a resource metric known to
157 // Kubernetes, as specified in requests and limits, describing each pod in the
158 // current scale target (e.g. CPU or memory). The values will be averaged
159 // together before being compared to the target. Such metrics are built in to
160 // Kubernetes, and have special scaling options on top of those available to
161 // normal per-pod metrics using the "pods" source. Only one "target" type
163 type ResourceMetricSource struct {
164 // name is the name of the resource in question.
165 Name v1.ResourceName `json:"name" protobuf:"bytes,1,name=name"`
166 // targetAverageUtilization is the target value of the average of the
167 // resource metric across all relevant pods, represented as a percentage of
168 // the requested value of the resource for the pods.
170 TargetAverageUtilization *int32 `json:"targetAverageUtilization,omitempty" protobuf:"varint,2,opt,name=targetAverageUtilization"`
171 // targetAverageValue is the target value of the average of the
172 // resource metric across all relevant pods, as a raw value (instead of as
173 // a percentage of the request), similar to the "pods" metric source type.
175 TargetAverageValue *resource.Quantity `json:"targetAverageValue,omitempty" protobuf:"bytes,3,opt,name=targetAverageValue"`
178 // ExternalMetricSource indicates how to scale on a metric not associated with
179 // any Kubernetes object (for example length of queue in cloud
180 // messaging service, or QPS from loadbalancer running outside of cluster).
181 // Exactly one "target" type should be set.
182 type ExternalMetricSource struct {
183 // metricName is the name of the metric in question.
184 MetricName string `json:"metricName" protobuf:"bytes,1,name=metricName"`
185 // metricSelector is used to identify a specific time series
186 // within a given metric.
188 MetricSelector *metav1.LabelSelector `json:"metricSelector,omitempty" protobuf:"bytes,2,opt,name=metricSelector"`
189 // targetValue is the target value of the metric (as a quantity).
190 // Mutually exclusive with TargetAverageValue.
192 TargetValue *resource.Quantity `json:"targetValue,omitempty" protobuf:"bytes,3,opt,name=targetValue"`
193 // targetAverageValue is the target per-pod value of global metric (as a quantity).
194 // Mutually exclusive with TargetValue.
196 TargetAverageValue *resource.Quantity `json:"targetAverageValue,omitempty" protobuf:"bytes,4,opt,name=targetAverageValue"`
199 // HorizontalPodAutoscalerStatus describes the current status of a horizontal pod autoscaler.
200 type HorizontalPodAutoscalerStatus struct {
201 // observedGeneration is the most recent generation observed by this autoscaler.
203 ObservedGeneration *int64 `json:"observedGeneration,omitempty" protobuf:"varint,1,opt,name=observedGeneration"`
205 // lastScaleTime is the last time the HorizontalPodAutoscaler scaled the number of pods,
206 // used by the autoscaler to control how often the number of pods is changed.
208 LastScaleTime *metav1.Time `json:"lastScaleTime,omitempty" protobuf:"bytes,2,opt,name=lastScaleTime"`
210 // currentReplicas is current number of replicas of pods managed by this autoscaler,
211 // as last seen by the autoscaler.
212 CurrentReplicas int32 `json:"currentReplicas" protobuf:"varint,3,opt,name=currentReplicas"`
214 // desiredReplicas is the desired number of replicas of pods managed by this autoscaler,
215 // as last calculated by the autoscaler.
216 DesiredReplicas int32 `json:"desiredReplicas" protobuf:"varint,4,opt,name=desiredReplicas"`
218 // currentMetrics is the last read state of the metrics used by this autoscaler.
220 CurrentMetrics []MetricStatus `json:"currentMetrics" protobuf:"bytes,5,rep,name=currentMetrics"`
222 // conditions is the set of conditions required for this autoscaler to scale its target,
223 // and indicates whether or not those conditions are met.
224 Conditions []HorizontalPodAutoscalerCondition `json:"conditions" protobuf:"bytes,6,rep,name=conditions"`
227 // HorizontalPodAutoscalerConditionType are the valid conditions of
228 // a HorizontalPodAutoscaler.
229 type HorizontalPodAutoscalerConditionType string
232 // ScalingActive indicates that the HPA controller is able to scale if necessary:
233 // it's correctly configured, can fetch the desired metrics, and isn't disabled.
234 ScalingActive HorizontalPodAutoscalerConditionType = "ScalingActive"
235 // AbleToScale indicates a lack of transient issues which prevent scaling from occurring,
236 // such as being in a backoff window, or being unable to access/update the target scale.
237 AbleToScale HorizontalPodAutoscalerConditionType = "AbleToScale"
238 // ScalingLimited indicates that the calculated scale based on metrics would be above or
239 // below the range for the HPA, and has thus been capped.
240 ScalingLimited HorizontalPodAutoscalerConditionType = "ScalingLimited"
243 // HorizontalPodAutoscalerCondition describes the state of
244 // a HorizontalPodAutoscaler at a certain point.
245 type HorizontalPodAutoscalerCondition struct {
246 // type describes the current condition
247 Type HorizontalPodAutoscalerConditionType `json:"type" protobuf:"bytes,1,name=type"`
248 // status is the status of the condition (True, False, Unknown)
249 Status v1.ConditionStatus `json:"status" protobuf:"bytes,2,name=status"`
250 // lastTransitionTime is the last time the condition transitioned from
251 // one status to another
253 LastTransitionTime metav1.Time `json:"lastTransitionTime,omitempty" protobuf:"bytes,3,opt,name=lastTransitionTime"`
254 // reason is the reason for the condition's last transition.
256 Reason string `json:"reason,omitempty" protobuf:"bytes,4,opt,name=reason"`
257 // message is a human-readable explanation containing details about
260 Message string `json:"message,omitempty" protobuf:"bytes,5,opt,name=message"`
263 // MetricStatus describes the last-read state of a single metric.
264 type MetricStatus struct {
265 // type is the type of metric source. It will be one of "Object",
266 // "Pods" or "Resource", each corresponds to a matching field in the object.
267 Type MetricSourceType `json:"type" protobuf:"bytes,1,name=type"`
269 // object refers to a metric describing a single kubernetes object
270 // (for example, hits-per-second on an Ingress object).
272 Object *ObjectMetricStatus `json:"object,omitempty" protobuf:"bytes,2,opt,name=object"`
273 // pods refers to a metric describing each pod in the current scale target
274 // (for example, transactions-processed-per-second). The values will be
275 // averaged together before being compared to the target value.
277 Pods *PodsMetricStatus `json:"pods,omitempty" protobuf:"bytes,3,opt,name=pods"`
278 // resource refers to a resource metric (such as those specified in
279 // requests and limits) known to Kubernetes describing each pod in the
280 // current scale target (e.g. CPU or memory). Such metrics are built in to
281 // Kubernetes, and have special scaling options on top of those available
282 // to normal per-pod metrics using the "pods" source.
284 Resource *ResourceMetricStatus `json:"resource,omitempty" protobuf:"bytes,4,opt,name=resource"`
285 // external refers to a global metric that is not associated
286 // with any Kubernetes object. It allows autoscaling based on information
287 // coming from components running outside of cluster
288 // (for example length of queue in cloud messaging service, or
289 // QPS from loadbalancer running outside of cluster).
291 External *ExternalMetricStatus `json:"external,omitempty" protobuf:"bytes,5,opt,name=external"`
294 // ObjectMetricStatus indicates the current value of a metric describing a
295 // kubernetes object (for example, hits-per-second on an Ingress object).
296 type ObjectMetricStatus struct {
297 // target is the described Kubernetes object.
298 Target CrossVersionObjectReference `json:"target" protobuf:"bytes,1,name=target"`
300 // metricName is the name of the metric in question.
301 MetricName string `json:"metricName" protobuf:"bytes,2,name=metricName"`
302 // currentValue is the current value of the metric (as a quantity).
303 CurrentValue resource.Quantity `json:"currentValue" protobuf:"bytes,3,name=currentValue"`
305 // selector is the string-encoded form of a standard kubernetes label selector for the given metric
306 // When set in the ObjectMetricSource, it is passed as an additional parameter to the metrics server for more specific metrics scoping.
307 // When unset, just the metricName will be used to gather metrics.
309 Selector *metav1.LabelSelector `json:"selector,omitempty" protobuf:"bytes,4,name=selector"`
310 // averageValue is the current value of the average of the
311 // metric across all relevant pods (as a quantity)
313 AverageValue *resource.Quantity `json:"averageValue,omitempty" protobuf:"bytes,5,name=averageValue"`
316 // PodsMetricStatus indicates the current value of a metric describing each pod in
317 // the current scale target (for example, transactions-processed-per-second).
318 type PodsMetricStatus struct {
319 // metricName is the name of the metric in question
320 MetricName string `json:"metricName" protobuf:"bytes,1,name=metricName"`
321 // currentAverageValue is the current value of the average of the
322 // metric across all relevant pods (as a quantity)
323 CurrentAverageValue resource.Quantity `json:"currentAverageValue" protobuf:"bytes,2,name=currentAverageValue"`
325 // selector is the string-encoded form of a standard kubernetes label selector for the given metric
326 // When set in the PodsMetricSource, it is passed as an additional parameter to the metrics server for more specific metrics scoping.
327 // When unset, just the metricName will be used to gather metrics.
329 Selector *metav1.LabelSelector `json:"selector,omitempty" protobuf:"bytes,3,name=selector"`
332 // ResourceMetricStatus indicates the current value of a resource metric known to
333 // Kubernetes, as specified in requests and limits, describing each pod in the
334 // current scale target (e.g. CPU or memory). Such metrics are built in to
335 // Kubernetes, and have special scaling options on top of those available to
336 // normal per-pod metrics using the "pods" source.
337 type ResourceMetricStatus struct {
338 // name is the name of the resource in question.
339 Name v1.ResourceName `json:"name" protobuf:"bytes,1,name=name"`
340 // currentAverageUtilization is the current value of the average of the
341 // resource metric across all relevant pods, represented as a percentage of
342 // the requested value of the resource for the pods. It will only be
343 // present if `targetAverageValue` was set in the corresponding metric
346 CurrentAverageUtilization *int32 `json:"currentAverageUtilization,omitempty" protobuf:"bytes,2,opt,name=currentAverageUtilization"`
347 // currentAverageValue is the current value of the average of the
348 // resource metric across all relevant pods, as a raw value (instead of as
349 // a percentage of the request), similar to the "pods" metric source type.
350 // It will always be set, regardless of the corresponding metric specification.
351 CurrentAverageValue resource.Quantity `json:"currentAverageValue" protobuf:"bytes,3,name=currentAverageValue"`
354 // ExternalMetricStatus indicates the current value of a global metric
355 // not associated with any Kubernetes object.
356 type ExternalMetricStatus struct {
357 // metricName is the name of a metric used for autoscaling in
359 MetricName string `json:"metricName" protobuf:"bytes,1,name=metricName"`
360 // metricSelector is used to identify a specific time series
361 // within a given metric.
363 MetricSelector *metav1.LabelSelector `json:"metricSelector,omitempty" protobuf:"bytes,2,opt,name=metricSelector"`
364 // currentValue is the current value of the metric (as a quantity)
365 CurrentValue resource.Quantity `json:"currentValue" protobuf:"bytes,3,name=currentValue"`
366 // currentAverageValue is the current value of metric averaged over autoscaled pods.
368 CurrentAverageValue *resource.Quantity `json:"currentAverageValue,omitempty" protobuf:"bytes,4,opt,name=currentAverageValue"`
372 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
374 // HorizontalPodAutoscaler is the configuration for a horizontal pod
375 // autoscaler, which automatically manages the replica count of any resource
376 // implementing the scale subresource based on the metrics specified.
377 type HorizontalPodAutoscaler struct {
378 metav1.TypeMeta `json:",inline"`
379 // metadata is the standard object metadata.
380 // More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#metadata
382 metav1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
384 // spec is the specification for the behaviour of the autoscaler.
385 // More info: https://git.k8s.io/community/contributors/devel/api-conventions.md#spec-and-status.
387 Spec HorizontalPodAutoscalerSpec `json:"spec,omitempty" protobuf:"bytes,2,opt,name=spec"`
389 // status is the current information about the autoscaler.
391 Status HorizontalPodAutoscalerStatus `json:"status,omitempty" protobuf:"bytes,3,opt,name=status"`
394 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
396 // HorizontalPodAutoscaler is a list of horizontal pod autoscaler objects.
397 type HorizontalPodAutoscalerList struct {
398 metav1.TypeMeta `json:",inline"`
399 // metadata is the standard list metadata.
401 metav1.ListMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
403 // items is the list of horizontal pod autoscaler objects.
404 Items []HorizontalPodAutoscaler `json:"items" protobuf:"bytes,2,rep,name=items"`