Add support for custom metrics for HPA (#2423)

* Add support for custom metrics for HPA
* Cleanup TargetCPUPercent references from possible places
* HPA v2beta has 80% default  cpu limit if not set

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

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

@@ -22,6 +22,7 @@ limitations under the License.
 package v1
 
 import (
+	v2beta2 "k8s.io/api/autoscaling/v2beta2"
 	corev1 "k8s.io/api/core/v1"
 	runtime "k8s.io/apimachinery/pkg/runtime"
 )
@@ -313,6 +314,18 @@ func (in *EnvironmentSpec) DeepCopy() *EnvironmentSpec {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *ExecutionStrategy) DeepCopyInto(out *ExecutionStrategy) {
 	*out = *in
+	if in.Metrics != nil {
+		in, out := &in.Metrics, &out.Metrics
+		*out = make([]v2beta2.MetricSpec, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+	if in.Behavior != nil {
+		in, out := &in.Behavior, &out.Behavior
+		*out = new(v2beta2.HorizontalPodAutoscalerBehavior)
+		(*in).DeepCopyInto(*out)
+	}
 	return
 }
 
@@ -442,7 +455,7 @@ func (in *FunctionSpec) DeepCopyInto(out *FunctionSpec) {
 		copy(*out, *in)
 	}
 	in.Resources.DeepCopyInto(&out.Resources)
-	out.InvokeStrategy = in.InvokeStrategy
+	in.InvokeStrategy.DeepCopyInto(&out.InvokeStrategy)
 	if in.IdleTimeout != nil {
 		in, out := &in.IdleTimeout, &out.IdleTimeout
 		*out = new(int)
@@ -580,7 +593,7 @@ func (in *IngressConfig) DeepCopy() *IngressConfig {
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *InvokeStrategy) DeepCopyInto(out *InvokeStrategy) {
 	*out = *in
-	out.ExecutionStrategy = in.ExecutionStrategy
+	in.ExecutionStrategy.DeepCopyInto(&out.ExecutionStrategy)
 	return
 }