Update custom-metrics-apiserver and metrics-server

vendor/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/skipnonapplied.go

@@ -18,7 +18,9 @@ package fieldmanager
 
 import (
 	"fmt"
+	"math/rand"
 
+	"k8s.io/apimachinery/pkg/api/meta"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 )
@@ -28,30 +30,53 @@ type skipNonAppliedManager struct {
 	objectCreater          runtime.ObjectCreater
 	gvk                    schema.GroupVersionKind
 	beforeApplyManagerName string
+	probability            float32
 }
 
 var _ Manager = &skipNonAppliedManager{}
 
 // NewSkipNonAppliedManager creates a new wrapped FieldManager that only starts tracking managers after the first apply.
 func NewSkipNonAppliedManager(fieldManager Manager, objectCreater runtime.ObjectCreater, gvk schema.GroupVersionKind) Manager {
+	return NewProbabilisticSkipNonAppliedManager(fieldManager, objectCreater, gvk, 0.0)
+}
+
+// NewProbabilisticSkipNonAppliedManager creates a new wrapped FieldManager that starts tracking managers after the first apply,
+// or starts tracking on create with p probability.
+func NewProbabilisticSkipNonAppliedManager(fieldManager Manager, objectCreater runtime.ObjectCreater, gvk schema.GroupVersionKind, p float32) Manager {
 	return &skipNonAppliedManager{
 		fieldManager:           fieldManager,
 		objectCreater:          objectCreater,
 		gvk:                    gvk,
 		beforeApplyManagerName: "before-first-apply",
+		probability:            p,
 	}
 }
 
 // Update implements Manager.
 func (f *skipNonAppliedManager) Update(liveObj, newObj runtime.Object, managed Managed, manager string) (runtime.Object, Managed, error) {
-	if len(managed.Fields()) == 0 {
+	accessor, err := meta.Accessor(liveObj)
+	if err != nil {
 		return newObj, managed, nil
 	}
+
+	// If managed fields is empty, we need to determine whether to skip tracking managed fields.
+	if len(managed.Fields()) == 0 {
+		// Check if the operation is a create, by checking whether lastObj's UID is empty.
+		// If the operation is create, P(tracking managed fields) = f.probability
+		// If the operation is update, skip tracking managed fields, since we already know managed fields is empty.
+		if len(accessor.GetUID()) == 0 {
+			if f.probability <= rand.Float32() {
+				return newObj, managed, nil
+			}
+		} else {
+			return newObj, managed, nil
+		}
+	}
 	return f.fieldManager.Update(liveObj, newObj, managed, manager)
 }
 
 // Apply implements Manager.
-func (f *skipNonAppliedManager) Apply(liveObj runtime.Object, patch []byte, managed Managed, fieldManager string, force bool) (runtime.Object, Managed, error) {
+func (f *skipNonAppliedManager) Apply(liveObj, appliedObj runtime.Object, managed Managed, fieldManager string, force bool) (runtime.Object, Managed, error) {
 	if len(managed.Fields()) == 0 {
 		emptyObj, err := f.objectCreater.New(f.gvk)
 		if err != nil {
@@ -62,5 +87,5 @@ func (f *skipNonAppliedManager) Apply(liveObj runtime.Object, patch []byte, mana
 			return nil, nil, fmt.Errorf("failed to create manager for existing fields: %v", err)
 		}
 	}
-	return f.fieldManager.Apply(liveObj, patch, managed, fieldManager, force)
+	return f.fieldManager.Apply(liveObj, appliedObj, managed, fieldManager, force)
 }