update kube and vendor dependencies

With kubernetes 1.18 release of client-go, signatures on methods in
generated clientsets, dynamic, metadata, and scale clients have been
modified to accept context.Context as a first argument.
Signatures of Create, Update, and Patch methods have been updated
to accept CreateOptions, UpdateOptions and PatchOptions respectively.
Signatures of Delete and DeleteCollection methods now accept
DeleteOptions by value instead of by reference.
These changes are now accommodated with this PR and client-go
and dependencies are updated to v1.18.0

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

vendor/k8s.io/api/autoscaling/v2beta2/generated.proto

@@ -64,6 +64,47 @@ message ExternalMetricStatus {
   optional MetricValueStatus current = 2;
 }
 
+// HPAScalingPolicy is a single policy which must hold true for a specified past interval.
+message HPAScalingPolicy {
+  // Type is used to specify the scaling policy.
+  optional string type = 1;
+
+  // Value contains the amount of change which is permitted by the policy.
+  // It must be greater than zero
+  optional int32 value = 2;
+
+  // 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).
+  optional int32 periodSeconds = 3;
+}
+
+// HPAScalingRules configures the scaling behavior for one direction.
+// These Rules are applied after calculating DesiredReplicas from metrics for the HPA.
+// 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.
+message HPAScalingRules {
+  // 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
+  optional int32 stabilizationWindowSeconds = 3;
+
+  // selectPolicy is used to specify which policy should be used.
+  // If not set, the default value MaxPolicySelect is used.
+  // +optional
+  optional string selectPolicy = 1;
+
+  // policies is a list of potential scaling polices which can be used during scaling.
+  // At least one policy must be specified, otherwise the HPAScalingRules will be discarded as invalid
+  // +optional
+  repeated HPAScalingPolicy policies = 2;
+}
+
 // HorizontalPodAutoscaler is the configuration for a horizontal pod
 // autoscaler, which automatically manages the replica count of any resource
 // implementing the scale subresource based on the metrics specified.
@@ -83,6 +124,25 @@ message HorizontalPodAutoscaler {
   optional HorizontalPodAutoscalerStatus status = 3;
 }
 
+// HorizontalPodAutoscalerBehavior configures the scaling behavior of the target
+// in both Up and Down directions (scaleUp and scaleDown fields respectively).
+message HorizontalPodAutoscalerBehavior {
+  // 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
+  optional HPAScalingRules scaleUp = 1;
+
+  // 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
+  optional HPAScalingRules scaleDown = 2;
+}
+
 // HorizontalPodAutoscalerCondition describes the state of
 // a HorizontalPodAutoscaler at a certain point.
 message HorizontalPodAutoscalerCondition {
@@ -145,6 +205,12 @@ message HorizontalPodAutoscalerSpec {
   // If not set, the default metric will be set to 80% average CPU utilization.
   // +optional
   repeated MetricSpec metrics = 4;
+
+  // 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.
+  // +optional
+  optional HorizontalPodAutoscalerBehavior behavior = 5;
 }
 
 // HorizontalPodAutoscalerStatus describes the current status of a horizontal pod autoscaler.