Merge pull request #46550 from DirectXMan12/feature/hpa-status-conditions

api/openapi-spec/swagger.json

@@ -52649,6 +52649,35 @@
      }
     ]
    },
+   "io.k8s.kubernetes.pkg.apis.autoscaling.v2alpha1.HorizontalPodAutoscalerCondition": {
+    "description": "HorizontalPodAutoscalerCondition describes the state of a HorizontalPodAutoscaler at a certain point.",
+    "required": [
+     "type",
+     "status"
+    ],
+    "properties": {
+     "lastTransitionTime": {
+      "description": "lastTransitionTime is the last time the condition transitioned from one status to another",
+      "$ref": "#/definitions/io.k8s.apimachinery.pkg.apis.meta.v1.Time"
+     },
+     "message": {
+      "description": "message is a human-readable explanation containing details about the transition",
+      "type": "string"
+     },
+     "reason": {
+      "description": "reason is the reason for the condition's last transition.",
+      "type": "string"
+     },
+     "status": {
+      "description": "status is the status of the condition (True, False, Unknown)",
+      "type": "string"
+     },
+     "type": {
+      "description": "type describes the current condition",
+      "type": "string"
+     }
+    }
+   },
    "io.k8s.kubernetes.pkg.apis.autoscaling.v2alpha1.HorizontalPodAutoscalerList": {
     "description": "HorizontalPodAutoscaler is a list of horizontal pod autoscaler objects.",
     "required": [
@@ -52718,9 +52747,17 @@
     "required": [
      "currentReplicas",
      "desiredReplicas",
-     "currentMetrics"
+     "currentMetrics",
+     "conditions"
     ],
     "properties": {
+     "conditions": {
+      "description": "conditions is the set of conditions required for this autoscaler to scale its target, and indicates whether or not those conditions are met.",
+      "type": "array",
+      "items": {
+       "$ref": "#/definitions/io.k8s.kubernetes.pkg.apis.autoscaling.v2alpha1.HorizontalPodAutoscalerCondition"
+      }
+     },
      "currentMetrics": {
       "description": "currentMetrics is the last read state of the metrics used by this autoscaler.",
       "type": "array",

api/swagger-spec/autoscaling_v2alpha1.json

@@ -1512,7 +1512,8 @@
     "required": [
      "currentReplicas",
      "desiredReplicas",
-     "currentMetrics"
+     "currentMetrics",
+     "conditions"
     ],
     "properties": {
      "observedGeneration": {
@@ -1540,6 +1541,13 @@
        "$ref": "v2alpha1.MetricStatus"
       },
       "description": "currentMetrics is the last read state of the metrics used by this autoscaler."
+     },
+     "conditions": {
+      "type": "array",
+      "items": {
+       "$ref": "v2alpha1.HorizontalPodAutoscalerCondition"
+      },
+      "description": "conditions is the set of conditions required for this autoscaler to scale its target, and indicates whether or not those conditions are met."
      }
     }
    },
@@ -1632,6 +1640,36 @@
      }
     }
    },
+   "v2alpha1.HorizontalPodAutoscalerCondition": {
+    "id": "v2alpha1.HorizontalPodAutoscalerCondition",
+    "description": "HorizontalPodAutoscalerCondition describes the state of a HorizontalPodAutoscaler at a certain point.",
+    "required": [
+     "type",
+     "status"
+    ],
+    "properties": {
+     "type": {
+      "type": "string",
+      "description": "type describes the current condition"
+     },
+     "status": {
+      "type": "string",
+      "description": "status is the status of the condition (True, False, Unknown)"
+     },
+     "lastTransitionTime": {
+      "type": "string",
+      "description": "lastTransitionTime is the last time the condition transitioned from one status to another"
+     },
+     "reason": {
+      "type": "string",
+      "description": "reason is the reason for the condition's last transition."
+     },
+     "message": {
+      "type": "string",
+      "description": "message is a human-readable explanation containing details about the transition"
+     }
+    }
+   },
    "v1.WatchEvent": {
     "id": "v1.WatchEvent",
     "required": [

docs/api-reference/autoscaling/v2alpha1/definitions.html

@@ -536,6 +536,13 @@ span.icon > [class^="icon-"], span.icon > [class*=" icon-"] { cursor: default; }
 <td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v2alpha1_metricstatus">v2alpha1.MetricStatus</a> array</p></td>
 <td class="tableblock halign-left valign-top"></td>
 </tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">conditions</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">conditions is the set of conditions required for this autoscaler to scale its target, and indicates whether or not those conditions are met.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock"><a href="#_v2alpha1_horizontalpodautoscalercondition">v2alpha1.HorizontalPodAutoscalerCondition</a> array</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
 </tbody>
 </table>
 
@@ -582,6 +589,68 @@ span.icon > [class^="icon-"], span.icon > [class*=" icon-"] { cursor: default; }
 
 </div>
 <div class="sect2">
+<h3 id="_v2alpha1_horizontalpodautoscalercondition">v2alpha1.HorizontalPodAutoscalerCondition</h3>
+<div class="paragraph">
+<p>HorizontalPodAutoscalerCondition describes the state of a HorizontalPodAutoscaler at a certain point.</p>
+</div>
+<table class="tableblock frame-all grid-all" style="width:100%; ">
+<colgroup>
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;">
+<col style="width:20%;"> 
+</colgroup>
+<thead>
+<tr>
+<th class="tableblock halign-left valign-top">Name</th>
+<th class="tableblock halign-left valign-top">Description</th>
+<th class="tableblock halign-left valign-top">Required</th>
+<th class="tableblock halign-left valign-top">Schema</th>
+<th class="tableblock halign-left valign-top">Default</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">type</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">type describes the current condition</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">status</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">status is the status of the condition (True, False, Unknown)</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">true</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">lastTransitionTime</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">lastTransitionTime is the last time the condition transitioned from one status to another</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">reason</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">reason is the reason for the condition&#8217;s last transition.</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+<tr>
+<td class="tableblock halign-left valign-top"><p class="tableblock">message</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">message is a human-readable explanation containing details about the transition</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">false</p></td>
+<td class="tableblock halign-left valign-top"><p class="tableblock">string</p></td>
+<td class="tableblock halign-left valign-top"></td>
+</tr>
+</tbody>
+</table>
+
+</div>
+<div class="sect2">
 <h3 id="_v2alpha1_resourcemetricsource">v2alpha1.ResourceMetricSource</h3>
 <div class="paragraph">
 <p>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.</p>
@@ -1882,7 +1951,7 @@ Examples:<br>
 </div>
 <div id="footer">
 <div id="footer-text">
-Last updated 2017-05-17 22:25:01 UTC
+Last updated 2017-05-31 21:20:13 UTC
 </div>
 </div>
 </body>

pkg/apis/autoscaling/annotations.go

@@ -24,6 +24,10 @@ const MetricSpecsAnnotation = "autoscaling.alpha.kubernetes.io/metrics"
 // statuses when converting the `CurrentMetrics` field from autoscaling/v2alpha1
 const MetricStatusesAnnotation = "autoscaling.alpha.kubernetes.io/current-metrics"
 
+// HorizontalPodAutoscalerConditionsAnnotation is the annotation which holds the conditions
+// of an HPA when converting the `Conditions` field from autoscaling/v2alpha1
+const HorizontalPodAutoscalerConditionsAnnotation = "autoscaling.alpha.kubernetes.io/conditions"
+
 // DefaultCPUUtilization is the default value for CPU utilization, provided no other
 // metrics are present.  This is here because it's used by both the v2alpha1 defaulting
 // logic, and the pseudo-defaulting done in v1 conversion.

pkg/apis/autoscaling/types.go

@@ -202,6 +202,59 @@ type HorizontalPodAutoscalerStatus struct {
 
 	// CurrentMetrics is the last read state of the metrics used by this autoscaler.
 	CurrentMetrics []MetricStatus
+
+	// Conditions is the set of conditions required for this autoscaler to scale its target,
+	// and indicates whether or not those conditions are met.
+	Conditions []HorizontalPodAutoscalerCondition
+}
+
+// ConditionStatus indicates the status of a condition (true, false, or unknown).
+type ConditionStatus string
+
+// These are valid condition statuses. "ConditionTrue" means a resource is in the condition;
+// "ConditionFalse" means a resource is not in the condition; "ConditionUnknown" means kubernetes
+// can't decide if a resource is in the condition or not. In the future, we could add other
+// intermediate conditions, e.g. ConditionDegraded.
+const (
+	ConditionTrue    ConditionStatus = "True"
+	ConditionFalse   ConditionStatus = "False"
+	ConditionUnknown ConditionStatus = "Unknown"
+)
+
+// HorizontalPodAutoscalerConditionType are the valid conditions of
+// a HorizontalPodAutoscaler.
+type HorizontalPodAutoscalerConditionType string
+
+var (
+	// ScalingActive indicates that the HPA controller is able to scale if necessary:
+	// it's correctly configured, can fetch the desired metrics, and isn't disabled.
+	ScalingActive HorizontalPodAutoscalerConditionType = "ScalingActive"
+	// AbleToScale indicates a lack of transient issues which prevent scaling from occuring,
+	// such as being in a backoff window, or being unable to access/update the target scale.
+	AbleToScale HorizontalPodAutoscalerConditionType = "AbleToScale"
+	// ScalingLimited indicates that the calculated scale based on metrics would be above or
+	// below the range for the HPA, and has thus been capped.
+	ScalingLimited HorizontalPodAutoscalerConditionType = "ScalingLimited"
+)
+
+// HorizontalPodAutoscalerCondition describes the state of
+// a HorizontalPodAutoscaler at a certain point.
+type HorizontalPodAutoscalerCondition struct {
+	// Type describes the current condition
+	Type HorizontalPodAutoscalerConditionType
+	// Status is the status of the condition (True, False, Unknown)
+	Status ConditionStatus
+	// LastTransitionTime is the last time the condition transitioned from
+	// one status to another
+	// +optional
+	LastTransitionTime metav1.Time
+	// Reason is the reason for the condition's last transition.
+	// +optional
+	Reason string
+	// Message is a human-readable explanation containing details about
+	// the transition
+	// +optional
+	Message string
 }
 
 // MetricStatus describes the last-read state of a single metric.

pkg/apis/autoscaling/v1/conversion.go

@@ -68,9 +68,17 @@ func Convert_autoscaling_HorizontalPodAutoscaler_To_v1_HorizontalPodAutoscaler(i
 		}
 	}
 
-	if len(otherMetrics) > 0 || len(in.Status.CurrentMetrics) > 0 {
+	// store HPA conditions in an annotation
+	currentConditions := make([]HorizontalPodAutoscalerCondition, len(in.Status.Conditions))
+	for i, currentCondition := range in.Status.Conditions {
+		if err := Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition(&currentCondition, &currentConditions[i], s); err != nil {
+			return err
+		}
+	}
+
+	if len(otherMetrics) > 0 || len(in.Status.CurrentMetrics) > 0 || len(currentConditions) > 0 {
 		old := out.Annotations
-		out.Annotations = make(map[string]string, len(old)+2)
+		out.Annotations = make(map[string]string, len(old)+3)
 		if old != nil {
 			for k, v := range old {
 				out.Annotations[k] = v
@@ -94,6 +102,14 @@ func Convert_autoscaling_HorizontalPodAutoscaler_To_v1_HorizontalPodAutoscaler(i
 		out.Annotations[autoscaling.MetricStatusesAnnotation] = string(currentMetricsEnc)
 	}
 
+	if len(in.Status.Conditions) > 0 {
+		currentConditionsEnc, err := json.Marshal(currentConditions)
+		if err != nil {
+			return err
+		}
+		out.Annotations[autoscaling.HorizontalPodAutoscalerConditionsAnnotation] = string(currentConditionsEnc)
+	}
+
 	return nil
 }
 
@@ -154,6 +170,21 @@ func Convert_v1_HorizontalPodAutoscaler_To_autoscaling_HorizontalPodAutoscaler(i
 		*out.Spec.Metrics[0].Resource.TargetAverageUtilization = autoscaling.DefaultCPUUtilization
 	}
 
+	if currentConditionsEnc, hasCurrentConditions := out.Annotations[autoscaling.HorizontalPodAutoscalerConditionsAnnotation]; hasCurrentConditions {
+		var currentConditions []HorizontalPodAutoscalerCondition
+		if err := json.Unmarshal([]byte(currentConditionsEnc), &currentConditions); err != nil {
+			return err
+		}
+
+		out.Status.Conditions = make([]autoscaling.HorizontalPodAutoscalerCondition, len(currentConditions))
+		for i, currentCondition := range currentConditions {
+			if err := Convert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(&currentCondition, &out.Status.Conditions[i], s); err != nil {
+				return err
+			}
+		}
+		delete(out.Annotations, autoscaling.HorizontalPodAutoscalerConditionsAnnotation)
+	}
+
 	return nil
 }
 

pkg/apis/autoscaling/v1/generated.proto

@@ -59,6 +59,30 @@ message HorizontalPodAutoscaler {
   optional HorizontalPodAutoscalerStatus status = 3;
 }
 
+// HorizontalPodAutoscalerCondition describes the state of
+// a HorizontalPodAutoscaler at a certain point.
+message HorizontalPodAutoscalerCondition {
+  // type describes the current condition
+  optional string type = 1;
+
+  // status is the status of the condition (True, False, Unknown)
+  optional string status = 2;
+
+  // lastTransitionTime is the last time the condition transitioned from
+  // one status to another
+  // +optional
+  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 3;
+
+  // reason is the reason for the condition's last transition.
+  // +optional
+  optional string reason = 4;
+
+  // message is a human-readable explanation containing details about
+  // the transition
+  // +optional
+  optional string message = 5;
+}
+
 // list of horizontal pod autoscaler objects.
 message HorizontalPodAutoscalerList {
   // Standard list metadata.

pkg/apis/autoscaling/v1/types.go

@@ -251,6 +251,42 @@ type MetricStatus struct {
 	Resource *ResourceMetricStatus `json:"resource,omitempty" protobuf:"bytes,4,opt,name=resource"`
 }
 
+// HorizontalPodAutoscalerConditionType are the valid conditions of
+// a HorizontalPodAutoscaler.
+type HorizontalPodAutoscalerConditionType string
+
+var (
+	// ScalingActive indicates that the HPA controller is able to scale if necessary:
+	// it's correctly configured, can fetch the desired metrics, and isn't disabled.
+	ScalingActive HorizontalPodAutoscalerConditionType = "ScalingActive"
+	// AbleToScale indicates a lack of transient issues which prevent scaling from occuring,
+	// such as being in a backoff window, or being unable to access/update the target scale.
+	AbleToScale HorizontalPodAutoscalerConditionType = "AbleToScale"
+	// ScalingLimited indicates that the calculated scale based on metrics would be above or
+	// below the range for the HPA, and has thus been capped.
+	ScalingLimited HorizontalPodAutoscalerConditionType = "ScalingLimited"
+)
+
+// HorizontalPodAutoscalerCondition describes the state of
+// a HorizontalPodAutoscaler at a certain point.
+type HorizontalPodAutoscalerCondition struct {
+	// type describes the current condition
+	Type HorizontalPodAutoscalerConditionType `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"`
+}
+
 // ObjectMetricStatus indicates the current value of a metric describing a
 // kubernetes object (for example, hits-per-second on an Ingress object).
 type ObjectMetricStatus struct {

pkg/apis/autoscaling/v1/types_swagger_doc_generated.go

@@ -49,6 +49,19 @@ func (HorizontalPodAutoscaler) SwaggerDoc() map[string]string {
 	return map_HorizontalPodAutoscaler
 }
 
+var map_HorizontalPodAutoscalerCondition = map[string]string{
+	"":                   "HorizontalPodAutoscalerCondition describes the state of a HorizontalPodAutoscaler at a certain point.",
+	"type":               "type describes the current condition",
+	"status":             "status is the status of the condition (True, False, Unknown)",
+	"lastTransitionTime": "lastTransitionTime is the last time the condition transitioned from one status to another",
+	"reason":             "reason is the reason for the condition's last transition.",
+	"message":            "message is a human-readable explanation containing details about the transition",
+}
+
+func (HorizontalPodAutoscalerCondition) SwaggerDoc() map[string]string {
+	return map_HorizontalPodAutoscalerCondition
+}
+
 var map_HorizontalPodAutoscalerList = map[string]string{
 	"":         "list of horizontal pod autoscaler objects.",
 	"metadata": "Standard list metadata.",

pkg/apis/autoscaling/v1/zz_generated.conversion.go

@@ -43,6 +43,8 @@ func RegisterConversions(scheme *runtime.Scheme) error {
 		Convert_autoscaling_CrossVersionObjectReference_To_v1_CrossVersionObjectReference,
 		Convert_v1_HorizontalPodAutoscaler_To_autoscaling_HorizontalPodAutoscaler,
 		Convert_autoscaling_HorizontalPodAutoscaler_To_v1_HorizontalPodAutoscaler,
+		Convert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition,
+		Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition,
 		Convert_v1_HorizontalPodAutoscalerList_To_autoscaling_HorizontalPodAutoscalerList,
 		Convert_autoscaling_HorizontalPodAutoscalerList_To_v1_HorizontalPodAutoscalerList,
 		Convert_v1_HorizontalPodAutoscalerSpec_To_autoscaling_HorizontalPodAutoscalerSpec,
@@ -120,6 +122,34 @@ func autoConvert_autoscaling_HorizontalPodAutoscaler_To_v1_HorizontalPodAutoscal
 	return nil
 }
 
+func autoConvert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in *HorizontalPodAutoscalerCondition, out *autoscaling.HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	out.Type = autoscaling.HorizontalPodAutoscalerConditionType(in.Type)
+	out.Status = autoscaling.ConditionStatus(in.Status)
+	out.LastTransitionTime = in.LastTransitionTime
+	out.Reason = in.Reason
+	out.Message = in.Message
+	return nil
+}
+
+// Convert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition is an autogenerated conversion function.
+func Convert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in *HorizontalPodAutoscalerCondition, out *autoscaling.HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	return autoConvert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in, out, s)
+}
+
+func autoConvert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition(in *autoscaling.HorizontalPodAutoscalerCondition, out *HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	out.Type = HorizontalPodAutoscalerConditionType(in.Type)
+	out.Status = api_v1.ConditionStatus(in.Status)
+	out.LastTransitionTime = in.LastTransitionTime
+	out.Reason = in.Reason
+	out.Message = in.Message
+	return nil
+}
+
+// Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition is an autogenerated conversion function.
+func Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition(in *autoscaling.HorizontalPodAutoscalerCondition, out *HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	return autoConvert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition(in, out, s)
+}
+
 func autoConvert_v1_HorizontalPodAutoscalerList_To_autoscaling_HorizontalPodAutoscalerList(in *HorizontalPodAutoscalerList, out *autoscaling.HorizontalPodAutoscalerList, s conversion.Scope) error {
 	out.ListMeta = in.ListMeta
 	if in.Items != nil {
@@ -197,6 +227,7 @@ func autoConvert_autoscaling_HorizontalPodAutoscalerStatus_To_v1_HorizontalPodAu
 	out.CurrentReplicas = in.CurrentReplicas
 	out.DesiredReplicas = in.DesiredReplicas
 	// WARNING: in.CurrentMetrics requires manual conversion: does not exist in peer-type
+	// WARNING: in.Conditions requires manual conversion: does not exist in peer-type
 	return nil
 }
 

pkg/apis/autoscaling/v1/zz_generated.deepcopy.go

@@ -38,6 +38,7 @@ func RegisterDeepCopies(scheme *runtime.Scheme) error {
 	return scheme.AddGeneratedDeepCopyFuncs(
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_CrossVersionObjectReference, InType: reflect.TypeOf(&CrossVersionObjectReference{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_HorizontalPodAutoscaler, InType: reflect.TypeOf(&HorizontalPodAutoscaler{})},
+		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_HorizontalPodAutoscalerCondition, InType: reflect.TypeOf(&HorizontalPodAutoscalerCondition{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_HorizontalPodAutoscalerList, InType: reflect.TypeOf(&HorizontalPodAutoscalerList{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_HorizontalPodAutoscalerSpec, InType: reflect.TypeOf(&HorizontalPodAutoscalerSpec{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_HorizontalPodAutoscalerStatus, InType: reflect.TypeOf(&HorizontalPodAutoscalerStatus{})},
@@ -86,6 +87,17 @@ func DeepCopy_v1_HorizontalPodAutoscaler(in interface{}, out interface{}, c *con
 	}
 }
 
+// DeepCopy_v1_HorizontalPodAutoscalerCondition is an autogenerated deepcopy function.
+func DeepCopy_v1_HorizontalPodAutoscalerCondition(in interface{}, out interface{}, c *conversion.Cloner) error {
+	{
+		in := in.(*HorizontalPodAutoscalerCondition)
+		out := out.(*HorizontalPodAutoscalerCondition)
+		*out = *in
+		out.LastTransitionTime = in.LastTransitionTime.DeepCopy()
+		return nil
+	}
+}
+
 // DeepCopy_v1_HorizontalPodAutoscalerList is an autogenerated deepcopy function.
 func DeepCopy_v1_HorizontalPodAutoscalerList(in interface{}, out interface{}, c *conversion.Cloner) error {
 	{

pkg/apis/autoscaling/v2alpha1/generated.proto

@@ -64,6 +64,30 @@ message HorizontalPodAutoscaler {
   optional HorizontalPodAutoscalerStatus status = 3;
 }
 
+// HorizontalPodAutoscalerCondition describes the state of
+// a HorizontalPodAutoscaler at a certain point.
+message HorizontalPodAutoscalerCondition {
+  // type describes the current condition
+  optional string type = 1;
+
+  // status is the status of the condition (True, False, Unknown)
+  optional string status = 2;
+
+  // lastTransitionTime is the last time the condition transitioned from
+  // one status to another
+  // +optional
+  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 3;
+
+  // reason is the reason for the condition's last transition.
+  // +optional
+  optional string reason = 4;
+
+  // message is a human-readable explanation containing details about
+  // the transition
+  // +optional
+  optional string message = 5;
+}
+
 // HorizontalPodAutoscaler is a list of horizontal pod autoscaler objects.
 message HorizontalPodAutoscalerList {
   // metadata is the standard list metadata.
@@ -121,6 +145,10 @@ message HorizontalPodAutoscalerStatus {
 
   // currentMetrics is the last read state of the metrics used by this autoscaler.
   repeated MetricStatus currentMetrics = 5;
+
+  // conditions is the set of conditions required for this autoscaler to scale its target,
+  // and indicates whether or not those conditions are met.
+  repeated HorizontalPodAutoscalerCondition conditions = 6;
 }
 
 // MetricSpec specifies how to scale based on a single metric

pkg/apis/autoscaling/v2alpha1/types.go

@@ -166,6 +166,46 @@ type HorizontalPodAutoscalerStatus struct {
 
 	// currentMetrics is the last read state of the metrics used by this autoscaler.
 	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 []HorizontalPodAutoscalerCondition `json:"conditions" protobuf:"bytes,6,rep,name=conditions"`
+}
+
+// HorizontalPodAutoscalerConditionType are the valid conditions of
+// a HorizontalPodAutoscaler.
+type HorizontalPodAutoscalerConditionType string
+
+var (
+	// ScalingActive indicates that the HPA controller is able to scale if necessary:
+	// it's correctly configured, can fetch the desired metrics, and isn't disabled.
+	ScalingActive HorizontalPodAutoscalerConditionType = "ScalingActive"
+	// AbleToScale indicates a lack of transient issues which prevent scaling from occuring,
+	// such as being in a backoff window, or being unable to access/update the target scale.
+	AbleToScale HorizontalPodAutoscalerConditionType = "AbleToScale"
+	// ScalingLimited indicates that the calculated scale based on metrics would be above or
+	// below the range for the HPA, and has thus been capped.
+	ScalingLimited HorizontalPodAutoscalerConditionType = "ScalingLimited"
+)
+
+// HorizontalPodAutoscalerCondition describes the state of
+// a HorizontalPodAutoscaler at a certain point.
+type HorizontalPodAutoscalerCondition struct {
+	// type describes the current condition
+	Type HorizontalPodAutoscalerConditionType `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.

pkg/apis/autoscaling/v2alpha1/types_swagger_doc_generated.go

@@ -49,6 +49,19 @@ func (HorizontalPodAutoscaler) SwaggerDoc() map[string]string {
 	return map_HorizontalPodAutoscaler
 }
 
+var map_HorizontalPodAutoscalerCondition = map[string]string{
+	"":                   "HorizontalPodAutoscalerCondition describes the state of a HorizontalPodAutoscaler at a certain point.",
+	"type":               "type describes the current condition",
+	"status":             "status is the status of the condition (True, False, Unknown)",
+	"lastTransitionTime": "lastTransitionTime is the last time the condition transitioned from one status to another",
+	"reason":             "reason is the reason for the condition's last transition.",
+	"message":            "message is a human-readable explanation containing details about the transition",
+}
+
+func (HorizontalPodAutoscalerCondition) SwaggerDoc() map[string]string {
+	return map_HorizontalPodAutoscalerCondition
+}
+
 var map_HorizontalPodAutoscalerList = map[string]string{
 	"":         "HorizontalPodAutoscaler is a list of horizontal pod autoscaler objects.",
 	"metadata": "metadata is the standard list metadata.",
@@ -78,6 +91,7 @@ var map_HorizontalPodAutoscalerStatus = map[string]string{
 	"currentReplicas":    "currentReplicas is current number of replicas of pods managed by this autoscaler, as last seen by the autoscaler.",
 	"desiredReplicas":    "desiredReplicas is the desired number of replicas of pods managed by this autoscaler, as last calculated by the autoscaler.",
 	"currentMetrics":     "currentMetrics is the last read state of the metrics used by this autoscaler.",
+	"conditions":         "conditions is the set of conditions required for this autoscaler to scale its target, and indicates whether or not those conditions are met.",
 }
 
 func (HorizontalPodAutoscalerStatus) SwaggerDoc() map[string]string {

pkg/apis/autoscaling/v2alpha1/zz_generated.conversion.go

@@ -22,11 +22,11 @@ package v2alpha1
 
 import (
 	resource "k8s.io/apimachinery/pkg/api/resource"
-	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	conversion "k8s.io/apimachinery/pkg/conversion"
 	runtime "k8s.io/apimachinery/pkg/runtime"
 	api "k8s.io/kubernetes/pkg/api"
-	api_v1 "k8s.io/kubernetes/pkg/api/v1"
+	v1 "k8s.io/kubernetes/pkg/api/v1"
 	autoscaling "k8s.io/kubernetes/pkg/apis/autoscaling"
 	unsafe "unsafe"
 )
@@ -43,6 +43,8 @@ func RegisterConversions(scheme *runtime.Scheme) error {
 		Convert_autoscaling_CrossVersionObjectReference_To_v2alpha1_CrossVersionObjectReference,
 		Convert_v2alpha1_HorizontalPodAutoscaler_To_autoscaling_HorizontalPodAutoscaler,
 		Convert_autoscaling_HorizontalPodAutoscaler_To_v2alpha1_HorizontalPodAutoscaler,
+		Convert_v2alpha1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition,
+		Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v2alpha1_HorizontalPodAutoscalerCondition,
 		Convert_v2alpha1_HorizontalPodAutoscalerList_To_autoscaling_HorizontalPodAutoscalerList,
 		Convert_autoscaling_HorizontalPodAutoscalerList_To_v2alpha1_HorizontalPodAutoscalerList,
 		Convert_v2alpha1_HorizontalPodAutoscalerSpec_To_autoscaling_HorizontalPodAutoscalerSpec,
@@ -124,6 +126,34 @@ func Convert_autoscaling_HorizontalPodAutoscaler_To_v2alpha1_HorizontalPodAutosc
 	return autoConvert_autoscaling_HorizontalPodAutoscaler_To_v2alpha1_HorizontalPodAutoscaler(in, out, s)
 }
 
+func autoConvert_v2alpha1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in *HorizontalPodAutoscalerCondition, out *autoscaling.HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	out.Type = autoscaling.HorizontalPodAutoscalerConditionType(in.Type)
+	out.Status = autoscaling.ConditionStatus(in.Status)
+	out.LastTransitionTime = in.LastTransitionTime
+	out.Reason = in.Reason
+	out.Message = in.Message
+	return nil
+}
+
+// Convert_v2alpha1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition is an autogenerated conversion function.
+func Convert_v2alpha1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in *HorizontalPodAutoscalerCondition, out *autoscaling.HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	return autoConvert_v2alpha1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in, out, s)
+}
+
+func autoConvert_autoscaling_HorizontalPodAutoscalerCondition_To_v2alpha1_HorizontalPodAutoscalerCondition(in *autoscaling.HorizontalPodAutoscalerCondition, out *HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	out.Type = HorizontalPodAutoscalerConditionType(in.Type)
+	out.Status = v1.ConditionStatus(in.Status)
+	out.LastTransitionTime = in.LastTransitionTime
+	out.Reason = in.Reason
+	out.Message = in.Message
+	return nil
+}
+
+// Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v2alpha1_HorizontalPodAutoscalerCondition is an autogenerated conversion function.
+func Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v2alpha1_HorizontalPodAutoscalerCondition(in *autoscaling.HorizontalPodAutoscalerCondition, out *HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	return autoConvert_autoscaling_HorizontalPodAutoscalerCondition_To_v2alpha1_HorizontalPodAutoscalerCondition(in, out, s)
+}
+
 func autoConvert_v2alpha1_HorizontalPodAutoscalerList_To_autoscaling_HorizontalPodAutoscalerList(in *HorizontalPodAutoscalerList, out *autoscaling.HorizontalPodAutoscalerList, s conversion.Scope) error {
 	out.ListMeta = in.ListMeta
 	out.Items = *(*[]autoscaling.HorizontalPodAutoscaler)(unsafe.Pointer(&in.Items))
@@ -182,10 +212,11 @@ func Convert_autoscaling_HorizontalPodAutoscalerSpec_To_v2alpha1_HorizontalPodAu
 
 func autoConvert_v2alpha1_HorizontalPodAutoscalerStatus_To_autoscaling_HorizontalPodAutoscalerStatus(in *HorizontalPodAutoscalerStatus, out *autoscaling.HorizontalPodAutoscalerStatus, s conversion.Scope) error {
 	out.ObservedGeneration = (*int64)(unsafe.Pointer(in.ObservedGeneration))
-	out.LastScaleTime = (*v1.Time)(unsafe.Pointer(in.LastScaleTime))
+	out.LastScaleTime = (*meta_v1.Time)(unsafe.Pointer(in.LastScaleTime))
 	out.CurrentReplicas = in.CurrentReplicas
 	out.DesiredReplicas = in.DesiredReplicas
 	out.CurrentMetrics = *(*[]autoscaling.MetricStatus)(unsafe.Pointer(&in.CurrentMetrics))
+	out.Conditions = *(*[]autoscaling.HorizontalPodAutoscalerCondition)(unsafe.Pointer(&in.Conditions))
 	return nil
 }
 
@@ -196,7 +227,7 @@ func Convert_v2alpha1_HorizontalPodAutoscalerStatus_To_autoscaling_HorizontalPod
 
 func autoConvert_autoscaling_HorizontalPodAutoscalerStatus_To_v2alpha1_HorizontalPodAutoscalerStatus(in *autoscaling.HorizontalPodAutoscalerStatus, out *HorizontalPodAutoscalerStatus, s conversion.Scope) error {
 	out.ObservedGeneration = (*int64)(unsafe.Pointer(in.ObservedGeneration))
-	out.LastScaleTime = (*v1.Time)(unsafe.Pointer(in.LastScaleTime))
+	out.LastScaleTime = (*meta_v1.Time)(unsafe.Pointer(in.LastScaleTime))
 	out.CurrentReplicas = in.CurrentReplicas
 	out.DesiredReplicas = in.DesiredReplicas
 	if in.CurrentMetrics == nil {
@@ -204,6 +235,11 @@ func autoConvert_autoscaling_HorizontalPodAutoscalerStatus_To_v2alpha1_Horizonta
 	} else {
 		out.CurrentMetrics = *(*[]MetricStatus)(unsafe.Pointer(&in.CurrentMetrics))
 	}
+	if in.Conditions == nil {
+		out.Conditions = make([]HorizontalPodAutoscalerCondition, 0)
+	} else {
+		out.Conditions = *(*[]HorizontalPodAutoscalerCondition)(unsafe.Pointer(&in.Conditions))
+	}
 	return nil
 }
 
@@ -377,7 +413,7 @@ func Convert_v2alpha1_ResourceMetricSource_To_autoscaling_ResourceMetricSource(i
 }
 
 func autoConvert_autoscaling_ResourceMetricSource_To_v2alpha1_ResourceMetricSource(in *autoscaling.ResourceMetricSource, out *ResourceMetricSource, s conversion.Scope) error {
-	out.Name = api_v1.ResourceName(in.Name)
+	out.Name = v1.ResourceName(in.Name)
 	out.TargetAverageUtilization = (*int32)(unsafe.Pointer(in.TargetAverageUtilization))
 	out.TargetAverageValue = (*resource.Quantity)(unsafe.Pointer(in.TargetAverageValue))
 	return nil
@@ -401,7 +437,7 @@ func Convert_v2alpha1_ResourceMetricStatus_To_autoscaling_ResourceMetricStatus(i
 }
 
 func autoConvert_autoscaling_ResourceMetricStatus_To_v2alpha1_ResourceMetricStatus(in *autoscaling.ResourceMetricStatus, out *ResourceMetricStatus, s conversion.Scope) error {
-	out.Name = api_v1.ResourceName(in.Name)
+	out.Name = v1.ResourceName(in.Name)
 	out.CurrentAverageUtilization = (*int32)(unsafe.Pointer(in.CurrentAverageUtilization))
 	out.CurrentAverageValue = in.CurrentAverageValue
 	return nil

pkg/apis/autoscaling/v2alpha1/zz_generated.deepcopy.go

@@ -38,6 +38,7 @@ func RegisterDeepCopies(scheme *runtime.Scheme) error {
 	return scheme.AddGeneratedDeepCopyFuncs(
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_CrossVersionObjectReference, InType: reflect.TypeOf(&CrossVersionObjectReference{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_HorizontalPodAutoscaler, InType: reflect.TypeOf(&HorizontalPodAutoscaler{})},
+		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_HorizontalPodAutoscalerCondition, InType: reflect.TypeOf(&HorizontalPodAutoscalerCondition{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_HorizontalPodAutoscalerList, InType: reflect.TypeOf(&HorizontalPodAutoscalerList{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_HorizontalPodAutoscalerSpec, InType: reflect.TypeOf(&HorizontalPodAutoscalerSpec{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_HorizontalPodAutoscalerStatus, InType: reflect.TypeOf(&HorizontalPodAutoscalerStatus{})},
@@ -83,6 +84,17 @@ func DeepCopy_v2alpha1_HorizontalPodAutoscaler(in interface{}, out interface{},
 	}
 }
 
+// DeepCopy_v2alpha1_HorizontalPodAutoscalerCondition is an autogenerated deepcopy function.
+func DeepCopy_v2alpha1_HorizontalPodAutoscalerCondition(in interface{}, out interface{}, c *conversion.Cloner) error {
+	{
+		in := in.(*HorizontalPodAutoscalerCondition)
+		out := out.(*HorizontalPodAutoscalerCondition)
+		*out = *in
+		out.LastTransitionTime = in.LastTransitionTime.DeepCopy()
+		return nil
+	}
+}
+
 // DeepCopy_v2alpha1_HorizontalPodAutoscalerList is an autogenerated deepcopy function.
 func DeepCopy_v2alpha1_HorizontalPodAutoscalerList(in interface{}, out interface{}, c *conversion.Cloner) error {
 	{
@@ -151,6 +163,15 @@ func DeepCopy_v2alpha1_HorizontalPodAutoscalerStatus(in interface{}, out interfa
 				}
 			}
 		}
+		if in.Conditions != nil {
+			in, out := &in.Conditions, &out.Conditions
+			*out = make([]HorizontalPodAutoscalerCondition, len(*in))
+			for i := range *in {
+				if err := DeepCopy_v2alpha1_HorizontalPodAutoscalerCondition(&(*in)[i], &(*out)[i], c); err != nil {
+					return err
+				}
+			}
+		}
 		return nil
 	}
 }

pkg/apis/autoscaling/zz_generated.deepcopy.go

@@ -38,6 +38,7 @@ func RegisterDeepCopies(scheme *runtime.Scheme) error {
 	return scheme.AddGeneratedDeepCopyFuncs(
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_CrossVersionObjectReference, InType: reflect.TypeOf(&CrossVersionObjectReference{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_HorizontalPodAutoscaler, InType: reflect.TypeOf(&HorizontalPodAutoscaler{})},
+		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_HorizontalPodAutoscalerCondition, InType: reflect.TypeOf(&HorizontalPodAutoscalerCondition{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_HorizontalPodAutoscalerList, InType: reflect.TypeOf(&HorizontalPodAutoscalerList{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_HorizontalPodAutoscalerSpec, InType: reflect.TypeOf(&HorizontalPodAutoscalerSpec{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_HorizontalPodAutoscalerStatus, InType: reflect.TypeOf(&HorizontalPodAutoscalerStatus{})},
@@ -86,6 +87,17 @@ func DeepCopy_autoscaling_HorizontalPodAutoscaler(in interface{}, out interface{
 	}
 }
 
+// DeepCopy_autoscaling_HorizontalPodAutoscalerCondition is an autogenerated deepcopy function.
+func DeepCopy_autoscaling_HorizontalPodAutoscalerCondition(in interface{}, out interface{}, c *conversion.Cloner) error {
+	{
+		in := in.(*HorizontalPodAutoscalerCondition)
+		out := out.(*HorizontalPodAutoscalerCondition)
+		*out = *in
+		out.LastTransitionTime = in.LastTransitionTime.DeepCopy()
+		return nil
+	}
+}
+
 // DeepCopy_autoscaling_HorizontalPodAutoscalerList is an autogenerated deepcopy function.
 func DeepCopy_autoscaling_HorizontalPodAutoscalerList(in interface{}, out interface{}, c *conversion.Cloner) error {
 	{
@@ -154,6 +166,15 @@ func DeepCopy_autoscaling_HorizontalPodAutoscalerStatus(in interface{}, out inte
 				}
 			}
 		}
+		if in.Conditions != nil {
+			in, out := &in.Conditions, &out.Conditions
+			*out = make([]HorizontalPodAutoscalerCondition, len(*in))
+			for i := range *in {
+				if err := DeepCopy_autoscaling_HorizontalPodAutoscalerCondition(&(*in)[i], &(*out)[i], c); err != nil {
+					return err
+				}
+			}
+		}
 		return nil
 	}
 }

pkg/controller/podautoscaler/BUILD

@@ -62,6 +62,7 @@ go_test(
     deps = [
         "//pkg/api:go_default_library",
         "//pkg/api/v1:go_default_library",
+        "//pkg/apis/autoscaling:go_default_library",
         "//pkg/apis/autoscaling/install:go_default_library",
         "//pkg/apis/autoscaling/v1:go_default_library",
         "//pkg/apis/autoscaling/v2alpha1:go_default_library",

pkg/printers/internalversion/describe.go

@@ -2627,6 +2627,14 @@ func describeHorizontalPodAutoscaler(hpa *autoscaling.HorizontalPodAutoscaler, e
 				w.Write(LEVEL_0, "failed to check Replication Controller\n")
 			}
 		}
+		if len(hpa.Status.Conditions) > 0 {
+			w.Write(LEVEL_0, "Conditions:\n")
+			w.Write(LEVEL_1, "Type\tStatus\tReason\tMessage\n")
+			w.Write(LEVEL_1, "----\t------\t------\t-------\n")
+			for _, c := range hpa.Status.Conditions {
+				w.Write(LEVEL_1, "%v\t%v\t%v\t%v\n", c.Type, c.Status, c.Reason, c.Message)
+			}
+		}
 
 		if events != nil {
 			DescribeEvents(events, w)

staging/src/k8s.io/client-go/pkg/apis/autoscaling/annotations.go

@@ -24,6 +24,10 @@ const MetricSpecsAnnotation = "autoscaling.alpha.kubernetes.io/metrics"
 // statuses when converting the `CurrentMetrics` field from autoscaling/v2alpha1
 const MetricStatusesAnnotation = "autoscaling.alpha.kubernetes.io/current-metrics"
 
+// HorizontalPodAutoscalerConditionsAnnotation is the annotation which holds the conditions
+// of an HPA when converting the `Conditions` field from autoscaling/v2alpha1
+const HorizontalPodAutoscalerConditionsAnnotation = "autoscaling.alpha.kubernetes.io/conditions"
+
 // DefaultCPUUtilization is the default value for CPU utilization, provided no other
 // metrics are present.  This is here because it's used by both the v2alpha1 defaulting
 // logic, and the pseudo-defaulting done in v1 conversion.

staging/src/k8s.io/client-go/pkg/apis/autoscaling/types.go

@@ -202,6 +202,59 @@ type HorizontalPodAutoscalerStatus struct {
 
 	// CurrentMetrics is the last read state of the metrics used by this autoscaler.
 	CurrentMetrics []MetricStatus
+
+	// Conditions is the set of conditions required for this autoscaler to scale its target,
+	// and indicates whether or not those conditions are met.
+	Conditions []HorizontalPodAutoscalerCondition
+}
+
+// ConditionStatus indicates the status of a condition (true, false, or unknown).
+type ConditionStatus string
+
+// These are valid condition statuses. "ConditionTrue" means a resource is in the condition;
+// "ConditionFalse" means a resource is not in the condition; "ConditionUnknown" means kubernetes
+// can't decide if a resource is in the condition or not. In the future, we could add other
+// intermediate conditions, e.g. ConditionDegraded.
+const (
+	ConditionTrue    ConditionStatus = "True"
+	ConditionFalse   ConditionStatus = "False"
+	ConditionUnknown ConditionStatus = "Unknown"
+)
+
+// HorizontalPodAutoscalerConditionType are the valid conditions of
+// a HorizontalPodAutoscaler.
+type HorizontalPodAutoscalerConditionType string
+
+var (
+	// ScalingActive indicates that the HPA controller is able to scale if necessary:
+	// it's correctly configured, can fetch the desired metrics, and isn't disabled.
+	ScalingActive HorizontalPodAutoscalerConditionType = "ScalingActive"
+	// AbleToScale indicates a lack of transient issues which prevent scaling from occuring,
+	// such as being in a backoff window, or being unable to access/update the target scale.
+	AbleToScale HorizontalPodAutoscalerConditionType = "AbleToScale"
+	// ScalingLimited indicates that the calculated scale based on metrics would be above or
+	// below the range for the HPA, and has thus been capped.
+	ScalingLimited HorizontalPodAutoscalerConditionType = "ScalingLimited"
+)
+
+// HorizontalPodAutoscalerCondition describes the state of
+// a HorizontalPodAutoscaler at a certain point.
+type HorizontalPodAutoscalerCondition struct {
+	// Type describes the current condition
+	Type HorizontalPodAutoscalerConditionType
+	// Status is the status of the condition (True, False, Unknown)
+	Status ConditionStatus
+	// LastTransitionTime is the last time the condition transitioned from
+	// one status to another
+	// +optional
+	LastTransitionTime metav1.Time
+	// Reason is the reason for the condition's last transition.
+	// +optional
+	Reason string
+	// Message is a human-readable explanation containing details about
+	// the transition
+	// +optional
+	Message string
 }
 
 // MetricStatus describes the last-read state of a single metric.

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v1/conversion.go

@@ -68,9 +68,17 @@ func Convert_autoscaling_HorizontalPodAutoscaler_To_v1_HorizontalPodAutoscaler(i
 		}
 	}
 
-	if len(otherMetrics) > 0 || len(in.Status.CurrentMetrics) > 0 {
+	// store HPA conditions in an annotation
+	currentConditions := make([]HorizontalPodAutoscalerCondition, len(in.Status.Conditions))
+	for i, currentCondition := range in.Status.Conditions {
+		if err := Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition(&currentCondition, &currentConditions[i], s); err != nil {
+			return err
+		}
+	}
+
+	if len(otherMetrics) > 0 || len(in.Status.CurrentMetrics) > 0 || len(currentConditions) > 0 {
 		old := out.Annotations
-		out.Annotations = make(map[string]string, len(old)+2)
+		out.Annotations = make(map[string]string, len(old)+3)
 		if old != nil {
 			for k, v := range old {
 				out.Annotations[k] = v
@@ -94,6 +102,14 @@ func Convert_autoscaling_HorizontalPodAutoscaler_To_v1_HorizontalPodAutoscaler(i
 		out.Annotations[autoscaling.MetricStatusesAnnotation] = string(currentMetricsEnc)
 	}
 
+	if len(in.Status.Conditions) > 0 {
+		currentConditionsEnc, err := json.Marshal(currentConditions)
+		if err != nil {
+			return err
+		}
+		out.Annotations[autoscaling.HorizontalPodAutoscalerConditionsAnnotation] = string(currentConditionsEnc)
+	}
+
 	return nil
 }
 
@@ -154,6 +170,21 @@ func Convert_v1_HorizontalPodAutoscaler_To_autoscaling_HorizontalPodAutoscaler(i
 		*out.Spec.Metrics[0].Resource.TargetAverageUtilization = autoscaling.DefaultCPUUtilization
 	}
 
+	if currentConditionsEnc, hasCurrentConditions := out.Annotations[autoscaling.HorizontalPodAutoscalerConditionsAnnotation]; hasCurrentConditions {
+		var currentConditions []HorizontalPodAutoscalerCondition
+		if err := json.Unmarshal([]byte(currentConditionsEnc), &currentConditions); err != nil {
+			return err
+		}
+
+		out.Status.Conditions = make([]autoscaling.HorizontalPodAutoscalerCondition, len(currentConditions))
+		for i, currentCondition := range currentConditions {
+			if err := Convert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(&currentCondition, &out.Status.Conditions[i], s); err != nil {
+				return err
+			}
+		}
+		delete(out.Annotations, autoscaling.HorizontalPodAutoscalerConditionsAnnotation)
+	}
+
 	return nil
 }
 

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v1/generated.proto

@@ -59,6 +59,30 @@ message HorizontalPodAutoscaler {
   optional HorizontalPodAutoscalerStatus status = 3;
 }
 
+// HorizontalPodAutoscalerCondition describes the state of
+// a HorizontalPodAutoscaler at a certain point.
+message HorizontalPodAutoscalerCondition {
+  // type describes the current condition
+  optional string type = 1;
+
+  // status is the status of the condition (True, False, Unknown)
+  optional string status = 2;
+
+  // lastTransitionTime is the last time the condition transitioned from
+  // one status to another
+  // +optional
+  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 3;
+
+  // reason is the reason for the condition's last transition.
+  // +optional
+  optional string reason = 4;
+
+  // message is a human-readable explanation containing details about
+  // the transition
+  // +optional
+  optional string message = 5;
+}
+
 // list of horizontal pod autoscaler objects.
 message HorizontalPodAutoscalerList {
   // Standard list metadata.

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v1/types.go

@@ -251,6 +251,42 @@ type MetricStatus struct {
 	Resource *ResourceMetricStatus `json:"resource,omitempty" protobuf:"bytes,4,opt,name=resource"`
 }
 
+// HorizontalPodAutoscalerConditionType are the valid conditions of
+// a HorizontalPodAutoscaler.
+type HorizontalPodAutoscalerConditionType string
+
+var (
+	// ScalingActive indicates that the HPA controller is able to scale if necessary:
+	// it's correctly configured, can fetch the desired metrics, and isn't disabled.
+	ScalingActive HorizontalPodAutoscalerConditionType = "ScalingActive"
+	// AbleToScale indicates a lack of transient issues which prevent scaling from occuring,
+	// such as being in a backoff window, or being unable to access/update the target scale.
+	AbleToScale HorizontalPodAutoscalerConditionType = "AbleToScale"
+	// ScalingLimited indicates that the calculated scale based on metrics would be above or
+	// below the range for the HPA, and has thus been capped.
+	ScalingLimited HorizontalPodAutoscalerConditionType = "ScalingLimited"
+)
+
+// HorizontalPodAutoscalerCondition describes the state of
+// a HorizontalPodAutoscaler at a certain point.
+type HorizontalPodAutoscalerCondition struct {
+	// type describes the current condition
+	Type HorizontalPodAutoscalerConditionType `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"`
+}
+
 // ObjectMetricStatus indicates the current value of a metric describing a
 // kubernetes object (for example, hits-per-second on an Ingress object).
 type ObjectMetricStatus struct {

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v1/types_swagger_doc_generated.go

@@ -49,6 +49,19 @@ func (HorizontalPodAutoscaler) SwaggerDoc() map[string]string {
 	return map_HorizontalPodAutoscaler
 }
 
+var map_HorizontalPodAutoscalerCondition = map[string]string{
+	"":                   "HorizontalPodAutoscalerCondition describes the state of a HorizontalPodAutoscaler at a certain point.",
+	"type":               "type describes the current condition",
+	"status":             "status is the status of the condition (True, False, Unknown)",
+	"lastTransitionTime": "lastTransitionTime is the last time the condition transitioned from one status to another",
+	"reason":             "reason is the reason for the condition's last transition.",
+	"message":            "message is a human-readable explanation containing details about the transition",
+}
+
+func (HorizontalPodAutoscalerCondition) SwaggerDoc() map[string]string {
+	return map_HorizontalPodAutoscalerCondition
+}
+
 var map_HorizontalPodAutoscalerList = map[string]string{
 	"":         "list of horizontal pod autoscaler objects.",
 	"metadata": "Standard list metadata.",

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v1/zz_generated.conversion.go

@@ -43,6 +43,8 @@ func RegisterConversions(scheme *runtime.Scheme) error {
 		Convert_autoscaling_CrossVersionObjectReference_To_v1_CrossVersionObjectReference,
 		Convert_v1_HorizontalPodAutoscaler_To_autoscaling_HorizontalPodAutoscaler,
 		Convert_autoscaling_HorizontalPodAutoscaler_To_v1_HorizontalPodAutoscaler,
+		Convert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition,
+		Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition,
 		Convert_v1_HorizontalPodAutoscalerList_To_autoscaling_HorizontalPodAutoscalerList,
 		Convert_autoscaling_HorizontalPodAutoscalerList_To_v1_HorizontalPodAutoscalerList,
 		Convert_v1_HorizontalPodAutoscalerSpec_To_autoscaling_HorizontalPodAutoscalerSpec,
@@ -120,6 +122,34 @@ func autoConvert_autoscaling_HorizontalPodAutoscaler_To_v1_HorizontalPodAutoscal
 	return nil
 }
 
+func autoConvert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in *HorizontalPodAutoscalerCondition, out *autoscaling.HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	out.Type = autoscaling.HorizontalPodAutoscalerConditionType(in.Type)
+	out.Status = autoscaling.ConditionStatus(in.Status)
+	out.LastTransitionTime = in.LastTransitionTime
+	out.Reason = in.Reason
+	out.Message = in.Message
+	return nil
+}
+
+// Convert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition is an autogenerated conversion function.
+func Convert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in *HorizontalPodAutoscalerCondition, out *autoscaling.HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	return autoConvert_v1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in, out, s)
+}
+
+func autoConvert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition(in *autoscaling.HorizontalPodAutoscalerCondition, out *HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	out.Type = HorizontalPodAutoscalerConditionType(in.Type)
+	out.Status = api_v1.ConditionStatus(in.Status)
+	out.LastTransitionTime = in.LastTransitionTime
+	out.Reason = in.Reason
+	out.Message = in.Message
+	return nil
+}
+
+// Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition is an autogenerated conversion function.
+func Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition(in *autoscaling.HorizontalPodAutoscalerCondition, out *HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	return autoConvert_autoscaling_HorizontalPodAutoscalerCondition_To_v1_HorizontalPodAutoscalerCondition(in, out, s)
+}
+
 func autoConvert_v1_HorizontalPodAutoscalerList_To_autoscaling_HorizontalPodAutoscalerList(in *HorizontalPodAutoscalerList, out *autoscaling.HorizontalPodAutoscalerList, s conversion.Scope) error {
 	out.ListMeta = in.ListMeta
 	if in.Items != nil {
@@ -197,6 +227,7 @@ func autoConvert_autoscaling_HorizontalPodAutoscalerStatus_To_v1_HorizontalPodAu
 	out.CurrentReplicas = in.CurrentReplicas
 	out.DesiredReplicas = in.DesiredReplicas
 	// WARNING: in.CurrentMetrics requires manual conversion: does not exist in peer-type
+	// WARNING: in.Conditions requires manual conversion: does not exist in peer-type
 	return nil
 }
 

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v1/zz_generated.deepcopy.go

@@ -38,6 +38,7 @@ func RegisterDeepCopies(scheme *runtime.Scheme) error {
 	return scheme.AddGeneratedDeepCopyFuncs(
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_CrossVersionObjectReference, InType: reflect.TypeOf(&CrossVersionObjectReference{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_HorizontalPodAutoscaler, InType: reflect.TypeOf(&HorizontalPodAutoscaler{})},
+		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_HorizontalPodAutoscalerCondition, InType: reflect.TypeOf(&HorizontalPodAutoscalerCondition{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_HorizontalPodAutoscalerList, InType: reflect.TypeOf(&HorizontalPodAutoscalerList{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_HorizontalPodAutoscalerSpec, InType: reflect.TypeOf(&HorizontalPodAutoscalerSpec{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v1_HorizontalPodAutoscalerStatus, InType: reflect.TypeOf(&HorizontalPodAutoscalerStatus{})},
@@ -86,6 +87,17 @@ func DeepCopy_v1_HorizontalPodAutoscaler(in interface{}, out interface{}, c *con
 	}
 }
 
+// DeepCopy_v1_HorizontalPodAutoscalerCondition is an autogenerated deepcopy function.
+func DeepCopy_v1_HorizontalPodAutoscalerCondition(in interface{}, out interface{}, c *conversion.Cloner) error {
+	{
+		in := in.(*HorizontalPodAutoscalerCondition)
+		out := out.(*HorizontalPodAutoscalerCondition)
+		*out = *in
+		out.LastTransitionTime = in.LastTransitionTime.DeepCopy()
+		return nil
+	}
+}
+
 // DeepCopy_v1_HorizontalPodAutoscalerList is an autogenerated deepcopy function.
 func DeepCopy_v1_HorizontalPodAutoscalerList(in interface{}, out interface{}, c *conversion.Cloner) error {
 	{

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v2alpha1/generated.proto

@@ -64,6 +64,30 @@ message HorizontalPodAutoscaler {
   optional HorizontalPodAutoscalerStatus status = 3;
 }
 
+// HorizontalPodAutoscalerCondition describes the state of
+// a HorizontalPodAutoscaler at a certain point.
+message HorizontalPodAutoscalerCondition {
+  // type describes the current condition
+  optional string type = 1;
+
+  // status is the status of the condition (True, False, Unknown)
+  optional string status = 2;
+
+  // lastTransitionTime is the last time the condition transitioned from
+  // one status to another
+  // +optional
+  optional k8s.io.apimachinery.pkg.apis.meta.v1.Time lastTransitionTime = 3;
+
+  // reason is the reason for the condition's last transition.
+  // +optional
+  optional string reason = 4;
+
+  // message is a human-readable explanation containing details about
+  // the transition
+  // +optional
+  optional string message = 5;
+}
+
 // HorizontalPodAutoscaler is a list of horizontal pod autoscaler objects.
 message HorizontalPodAutoscalerList {
   // metadata is the standard list metadata.
@@ -121,6 +145,10 @@ message HorizontalPodAutoscalerStatus {
 
   // currentMetrics is the last read state of the metrics used by this autoscaler.
   repeated MetricStatus currentMetrics = 5;
+
+  // conditions is the set of conditions required for this autoscaler to scale its target,
+  // and indicates whether or not those conditions are met.
+  repeated HorizontalPodAutoscalerCondition conditions = 6;
 }
 
 // MetricSpec specifies how to scale based on a single metric

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v2alpha1/types.go

@@ -166,6 +166,46 @@ type HorizontalPodAutoscalerStatus struct {
 
 	// currentMetrics is the last read state of the metrics used by this autoscaler.
 	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 []HorizontalPodAutoscalerCondition `json:"conditions" protobuf:"bytes,6,rep,name=conditions"`
+}
+
+// HorizontalPodAutoscalerConditionType are the valid conditions of
+// a HorizontalPodAutoscaler.
+type HorizontalPodAutoscalerConditionType string
+
+var (
+	// ScalingActive indicates that the HPA controller is able to scale if necessary:
+	// it's correctly configured, can fetch the desired metrics, and isn't disabled.
+	ScalingActive HorizontalPodAutoscalerConditionType = "ScalingActive"
+	// AbleToScale indicates a lack of transient issues which prevent scaling from occuring,
+	// such as being in a backoff window, or being unable to access/update the target scale.
+	AbleToScale HorizontalPodAutoscalerConditionType = "AbleToScale"
+	// ScalingLimited indicates that the calculated scale based on metrics would be above or
+	// below the range for the HPA, and has thus been capped.
+	ScalingLimited HorizontalPodAutoscalerConditionType = "ScalingLimited"
+)
+
+// HorizontalPodAutoscalerCondition describes the state of
+// a HorizontalPodAutoscaler at a certain point.
+type HorizontalPodAutoscalerCondition struct {
+	// type describes the current condition
+	Type HorizontalPodAutoscalerConditionType `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.

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v2alpha1/types_swagger_doc_generated.go

@@ -49,6 +49,19 @@ func (HorizontalPodAutoscaler) SwaggerDoc() map[string]string {
 	return map_HorizontalPodAutoscaler
 }
 
+var map_HorizontalPodAutoscalerCondition = map[string]string{
+	"":                   "HorizontalPodAutoscalerCondition describes the state of a HorizontalPodAutoscaler at a certain point.",
+	"type":               "type describes the current condition",
+	"status":             "status is the status of the condition (True, False, Unknown)",
+	"lastTransitionTime": "lastTransitionTime is the last time the condition transitioned from one status to another",
+	"reason":             "reason is the reason for the condition's last transition.",
+	"message":            "message is a human-readable explanation containing details about the transition",
+}
+
+func (HorizontalPodAutoscalerCondition) SwaggerDoc() map[string]string {
+	return map_HorizontalPodAutoscalerCondition
+}
+
 var map_HorizontalPodAutoscalerList = map[string]string{
 	"":         "HorizontalPodAutoscaler is a list of horizontal pod autoscaler objects.",
 	"metadata": "metadata is the standard list metadata.",
@@ -78,6 +91,7 @@ var map_HorizontalPodAutoscalerStatus = map[string]string{
 	"currentReplicas":    "currentReplicas is current number of replicas of pods managed by this autoscaler, as last seen by the autoscaler.",
 	"desiredReplicas":    "desiredReplicas is the desired number of replicas of pods managed by this autoscaler, as last calculated by the autoscaler.",
 	"currentMetrics":     "currentMetrics is the last read state of the metrics used by this autoscaler.",
+	"conditions":         "conditions is the set of conditions required for this autoscaler to scale its target, and indicates whether or not those conditions are met.",
 }
 
 func (HorizontalPodAutoscalerStatus) SwaggerDoc() map[string]string {

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v2alpha1/zz_generated.conversion.go

@@ -22,11 +22,11 @@ package v2alpha1
 
 import (
 	resource "k8s.io/apimachinery/pkg/api/resource"
-	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	conversion "k8s.io/apimachinery/pkg/conversion"
 	runtime "k8s.io/apimachinery/pkg/runtime"
 	api "k8s.io/client-go/pkg/api"
-	api_v1 "k8s.io/client-go/pkg/api/v1"
+	v1 "k8s.io/client-go/pkg/api/v1"
 	autoscaling "k8s.io/client-go/pkg/apis/autoscaling"
 	unsafe "unsafe"
 )
@@ -43,6 +43,8 @@ func RegisterConversions(scheme *runtime.Scheme) error {
 		Convert_autoscaling_CrossVersionObjectReference_To_v2alpha1_CrossVersionObjectReference,
 		Convert_v2alpha1_HorizontalPodAutoscaler_To_autoscaling_HorizontalPodAutoscaler,
 		Convert_autoscaling_HorizontalPodAutoscaler_To_v2alpha1_HorizontalPodAutoscaler,
+		Convert_v2alpha1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition,
+		Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v2alpha1_HorizontalPodAutoscalerCondition,
 		Convert_v2alpha1_HorizontalPodAutoscalerList_To_autoscaling_HorizontalPodAutoscalerList,
 		Convert_autoscaling_HorizontalPodAutoscalerList_To_v2alpha1_HorizontalPodAutoscalerList,
 		Convert_v2alpha1_HorizontalPodAutoscalerSpec_To_autoscaling_HorizontalPodAutoscalerSpec,
@@ -124,6 +126,34 @@ func Convert_autoscaling_HorizontalPodAutoscaler_To_v2alpha1_HorizontalPodAutosc
 	return autoConvert_autoscaling_HorizontalPodAutoscaler_To_v2alpha1_HorizontalPodAutoscaler(in, out, s)
 }
 
+func autoConvert_v2alpha1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in *HorizontalPodAutoscalerCondition, out *autoscaling.HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	out.Type = autoscaling.HorizontalPodAutoscalerConditionType(in.Type)
+	out.Status = autoscaling.ConditionStatus(in.Status)
+	out.LastTransitionTime = in.LastTransitionTime
+	out.Reason = in.Reason
+	out.Message = in.Message
+	return nil
+}
+
+// Convert_v2alpha1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition is an autogenerated conversion function.
+func Convert_v2alpha1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in *HorizontalPodAutoscalerCondition, out *autoscaling.HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	return autoConvert_v2alpha1_HorizontalPodAutoscalerCondition_To_autoscaling_HorizontalPodAutoscalerCondition(in, out, s)
+}
+
+func autoConvert_autoscaling_HorizontalPodAutoscalerCondition_To_v2alpha1_HorizontalPodAutoscalerCondition(in *autoscaling.HorizontalPodAutoscalerCondition, out *HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	out.Type = HorizontalPodAutoscalerConditionType(in.Type)
+	out.Status = v1.ConditionStatus(in.Status)
+	out.LastTransitionTime = in.LastTransitionTime
+	out.Reason = in.Reason
+	out.Message = in.Message
+	return nil
+}
+
+// Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v2alpha1_HorizontalPodAutoscalerCondition is an autogenerated conversion function.
+func Convert_autoscaling_HorizontalPodAutoscalerCondition_To_v2alpha1_HorizontalPodAutoscalerCondition(in *autoscaling.HorizontalPodAutoscalerCondition, out *HorizontalPodAutoscalerCondition, s conversion.Scope) error {
+	return autoConvert_autoscaling_HorizontalPodAutoscalerCondition_To_v2alpha1_HorizontalPodAutoscalerCondition(in, out, s)
+}
+
 func autoConvert_v2alpha1_HorizontalPodAutoscalerList_To_autoscaling_HorizontalPodAutoscalerList(in *HorizontalPodAutoscalerList, out *autoscaling.HorizontalPodAutoscalerList, s conversion.Scope) error {
 	out.ListMeta = in.ListMeta
 	out.Items = *(*[]autoscaling.HorizontalPodAutoscaler)(unsafe.Pointer(&in.Items))
@@ -182,10 +212,11 @@ func Convert_autoscaling_HorizontalPodAutoscalerSpec_To_v2alpha1_HorizontalPodAu
 
 func autoConvert_v2alpha1_HorizontalPodAutoscalerStatus_To_autoscaling_HorizontalPodAutoscalerStatus(in *HorizontalPodAutoscalerStatus, out *autoscaling.HorizontalPodAutoscalerStatus, s conversion.Scope) error {
 	out.ObservedGeneration = (*int64)(unsafe.Pointer(in.ObservedGeneration))
-	out.LastScaleTime = (*v1.Time)(unsafe.Pointer(in.LastScaleTime))
+	out.LastScaleTime = (*meta_v1.Time)(unsafe.Pointer(in.LastScaleTime))
 	out.CurrentReplicas = in.CurrentReplicas
 	out.DesiredReplicas = in.DesiredReplicas
 	out.CurrentMetrics = *(*[]autoscaling.MetricStatus)(unsafe.Pointer(&in.CurrentMetrics))
+	out.Conditions = *(*[]autoscaling.HorizontalPodAutoscalerCondition)(unsafe.Pointer(&in.Conditions))
 	return nil
 }
 
@@ -196,7 +227,7 @@ func Convert_v2alpha1_HorizontalPodAutoscalerStatus_To_autoscaling_HorizontalPod
 
 func autoConvert_autoscaling_HorizontalPodAutoscalerStatus_To_v2alpha1_HorizontalPodAutoscalerStatus(in *autoscaling.HorizontalPodAutoscalerStatus, out *HorizontalPodAutoscalerStatus, s conversion.Scope) error {
 	out.ObservedGeneration = (*int64)(unsafe.Pointer(in.ObservedGeneration))
-	out.LastScaleTime = (*v1.Time)(unsafe.Pointer(in.LastScaleTime))
+	out.LastScaleTime = (*meta_v1.Time)(unsafe.Pointer(in.LastScaleTime))
 	out.CurrentReplicas = in.CurrentReplicas
 	out.DesiredReplicas = in.DesiredReplicas
 	if in.CurrentMetrics == nil {
@@ -204,6 +235,11 @@ func autoConvert_autoscaling_HorizontalPodAutoscalerStatus_To_v2alpha1_Horizonta
 	} else {
 		out.CurrentMetrics = *(*[]MetricStatus)(unsafe.Pointer(&in.CurrentMetrics))
 	}
+	if in.Conditions == nil {
+		out.Conditions = make([]HorizontalPodAutoscalerCondition, 0)
+	} else {
+		out.Conditions = *(*[]HorizontalPodAutoscalerCondition)(unsafe.Pointer(&in.Conditions))
+	}
 	return nil
 }
 
@@ -377,7 +413,7 @@ func Convert_v2alpha1_ResourceMetricSource_To_autoscaling_ResourceMetricSource(i
 }
 
 func autoConvert_autoscaling_ResourceMetricSource_To_v2alpha1_ResourceMetricSource(in *autoscaling.ResourceMetricSource, out *ResourceMetricSource, s conversion.Scope) error {
-	out.Name = api_v1.ResourceName(in.Name)
+	out.Name = v1.ResourceName(in.Name)
 	out.TargetAverageUtilization = (*int32)(unsafe.Pointer(in.TargetAverageUtilization))
 	out.TargetAverageValue = (*resource.Quantity)(unsafe.Pointer(in.TargetAverageValue))
 	return nil
@@ -401,7 +437,7 @@ func Convert_v2alpha1_ResourceMetricStatus_To_autoscaling_ResourceMetricStatus(i
 }
 
 func autoConvert_autoscaling_ResourceMetricStatus_To_v2alpha1_ResourceMetricStatus(in *autoscaling.ResourceMetricStatus, out *ResourceMetricStatus, s conversion.Scope) error {
-	out.Name = api_v1.ResourceName(in.Name)
+	out.Name = v1.ResourceName(in.Name)
 	out.CurrentAverageUtilization = (*int32)(unsafe.Pointer(in.CurrentAverageUtilization))
 	out.CurrentAverageValue = in.CurrentAverageValue
 	return nil

staging/src/k8s.io/client-go/pkg/apis/autoscaling/v2alpha1/zz_generated.deepcopy.go

@@ -38,6 +38,7 @@ func RegisterDeepCopies(scheme *runtime.Scheme) error {
 	return scheme.AddGeneratedDeepCopyFuncs(
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_CrossVersionObjectReference, InType: reflect.TypeOf(&CrossVersionObjectReference{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_HorizontalPodAutoscaler, InType: reflect.TypeOf(&HorizontalPodAutoscaler{})},
+		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_HorizontalPodAutoscalerCondition, InType: reflect.TypeOf(&HorizontalPodAutoscalerCondition{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_HorizontalPodAutoscalerList, InType: reflect.TypeOf(&HorizontalPodAutoscalerList{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_HorizontalPodAutoscalerSpec, InType: reflect.TypeOf(&HorizontalPodAutoscalerSpec{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_v2alpha1_HorizontalPodAutoscalerStatus, InType: reflect.TypeOf(&HorizontalPodAutoscalerStatus{})},
@@ -83,6 +84,17 @@ func DeepCopy_v2alpha1_HorizontalPodAutoscaler(in interface{}, out interface{},
 	}
 }
 
+// DeepCopy_v2alpha1_HorizontalPodAutoscalerCondition is an autogenerated deepcopy function.
+func DeepCopy_v2alpha1_HorizontalPodAutoscalerCondition(in interface{}, out interface{}, c *conversion.Cloner) error {
+	{
+		in := in.(*HorizontalPodAutoscalerCondition)
+		out := out.(*HorizontalPodAutoscalerCondition)
+		*out = *in
+		out.LastTransitionTime = in.LastTransitionTime.DeepCopy()
+		return nil
+	}
+}
+
 // DeepCopy_v2alpha1_HorizontalPodAutoscalerList is an autogenerated deepcopy function.
 func DeepCopy_v2alpha1_HorizontalPodAutoscalerList(in interface{}, out interface{}, c *conversion.Cloner) error {
 	{
@@ -151,6 +163,15 @@ func DeepCopy_v2alpha1_HorizontalPodAutoscalerStatus(in interface{}, out interfa
 				}
 			}
 		}
+		if in.Conditions != nil {
+			in, out := &in.Conditions, &out.Conditions
+			*out = make([]HorizontalPodAutoscalerCondition, len(*in))
+			for i := range *in {
+				if err := DeepCopy_v2alpha1_HorizontalPodAutoscalerCondition(&(*in)[i], &(*out)[i], c); err != nil {
+					return err
+				}
+			}
+		}
 		return nil
 	}
 }

staging/src/k8s.io/client-go/pkg/apis/autoscaling/zz_generated.deepcopy.go

@@ -38,6 +38,7 @@ func RegisterDeepCopies(scheme *runtime.Scheme) error {
 	return scheme.AddGeneratedDeepCopyFuncs(
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_CrossVersionObjectReference, InType: reflect.TypeOf(&CrossVersionObjectReference{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_HorizontalPodAutoscaler, InType: reflect.TypeOf(&HorizontalPodAutoscaler{})},
+		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_HorizontalPodAutoscalerCondition, InType: reflect.TypeOf(&HorizontalPodAutoscalerCondition{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_HorizontalPodAutoscalerList, InType: reflect.TypeOf(&HorizontalPodAutoscalerList{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_HorizontalPodAutoscalerSpec, InType: reflect.TypeOf(&HorizontalPodAutoscalerSpec{})},
 		conversion.GeneratedDeepCopyFunc{Fn: DeepCopy_autoscaling_HorizontalPodAutoscalerStatus, InType: reflect.TypeOf(&HorizontalPodAutoscalerStatus{})},
@@ -86,6 +87,17 @@ func DeepCopy_autoscaling_HorizontalPodAutoscaler(in interface{}, out interface{
 	}
 }
 
+// DeepCopy_autoscaling_HorizontalPodAutoscalerCondition is an autogenerated deepcopy function.
+func DeepCopy_autoscaling_HorizontalPodAutoscalerCondition(in interface{}, out interface{}, c *conversion.Cloner) error {
+	{
+		in := in.(*HorizontalPodAutoscalerCondition)
+		out := out.(*HorizontalPodAutoscalerCondition)
+		*out = *in
+		out.LastTransitionTime = in.LastTransitionTime.DeepCopy()
+		return nil
+	}
+}
+
 // DeepCopy_autoscaling_HorizontalPodAutoscalerList is an autogenerated deepcopy function.
 func DeepCopy_autoscaling_HorizontalPodAutoscalerList(in interface{}, out interface{}, c *conversion.Cloner) error {
 	{
@@ -154,6 +166,15 @@ func DeepCopy_autoscaling_HorizontalPodAutoscalerStatus(in interface{}, out inte
 				}
 			}
 		}
+		if in.Conditions != nil {
+			in, out := &in.Conditions, &out.Conditions
+			*out = make([]HorizontalPodAutoscalerCondition, len(*in))
+			for i := range *in {
+				if err := DeepCopy_autoscaling_HorizontalPodAutoscalerCondition(&(*in)[i], &(*out)[i], c); err != nil {
+					return err
+				}
+			}
+		}
 		return nil
 	}
 }