1. update clientset, deepcopy using code-generator

2. add a dummy file tools.go to force "go mod vendor" to see
code-generator as dependencies
3. add a script to update CRD
4. add a README to document CRD updating steps
run go mod tidy
update README

vendor/k8s.io/client-go/informers/flowcontrol/v1alpha1/flowschema.go

@@ -0,0 +1,88 @@
+/*
+Copyright The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by informer-gen. DO NOT EDIT.
+
+package v1alpha1
+
+import (
+	time "time"
+
+	flowcontrolv1alpha1 "k8s.io/api/flowcontrol/v1alpha1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	runtime "k8s.io/apimachinery/pkg/runtime"
+	watch "k8s.io/apimachinery/pkg/watch"
+	internalinterfaces "k8s.io/client-go/informers/internalinterfaces"
+	kubernetes "k8s.io/client-go/kubernetes"
+	v1alpha1 "k8s.io/client-go/listers/flowcontrol/v1alpha1"
+	cache "k8s.io/client-go/tools/cache"
+)
+
+// FlowSchemaInformer provides access to a shared informer and lister for
+// FlowSchemas.
+type FlowSchemaInformer interface {
+	Informer() cache.SharedIndexInformer
+	Lister() v1alpha1.FlowSchemaLister
+}
+
+type flowSchemaInformer struct {
+	factory          internalinterfaces.SharedInformerFactory
+	tweakListOptions internalinterfaces.TweakListOptionsFunc
+}
+
+// NewFlowSchemaInformer constructs a new informer for FlowSchema type.
+// Always prefer using an informer factory to get a shared informer instead of getting an independent
+// one. This reduces memory footprint and number of connections to the server.
+func NewFlowSchemaInformer(client kubernetes.Interface, resyncPeriod time.Duration, indexers cache.Indexers) cache.SharedIndexInformer {
+	return NewFilteredFlowSchemaInformer(client, resyncPeriod, indexers, nil)
+}
+
+// NewFilteredFlowSchemaInformer constructs a new informer for FlowSchema type.
+// Always prefer using an informer factory to get a shared informer instead of getting an independent
+// one. This reduces memory footprint and number of connections to the server.
+func NewFilteredFlowSchemaInformer(client kubernetes.Interface, resyncPeriod time.Duration, indexers cache.Indexers, tweakListOptions internalinterfaces.TweakListOptionsFunc) cache.SharedIndexInformer {
+	return cache.NewSharedIndexInformer(
+		&cache.ListWatch{
+			ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
+				if tweakListOptions != nil {
+					tweakListOptions(&options)
+				}
+				return client.FlowcontrolV1alpha1().FlowSchemas().List(options)
+			},
+			WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
+				if tweakListOptions != nil {
+					tweakListOptions(&options)
+				}
+				return client.FlowcontrolV1alpha1().FlowSchemas().Watch(options)
+			},
+		},
+		&flowcontrolv1alpha1.FlowSchema{},
+		resyncPeriod,
+		indexers,
+	)
+}
+
+func (f *flowSchemaInformer) defaultInformer(client kubernetes.Interface, resyncPeriod time.Duration) cache.SharedIndexInformer {
+	return NewFilteredFlowSchemaInformer(client, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc}, f.tweakListOptions)
+}
+
+func (f *flowSchemaInformer) Informer() cache.SharedIndexInformer {
+	return f.factory.InformerFor(&flowcontrolv1alpha1.FlowSchema{}, f.defaultInformer)
+}
+
+func (f *flowSchemaInformer) Lister() v1alpha1.FlowSchemaLister {
+	return v1alpha1.NewFlowSchemaLister(f.Informer().GetIndexer())
+}

vendor/k8s.io/client-go/informers/flowcontrol/v1alpha1/interface.go

@@ -0,0 +1,52 @@
+/*
+Copyright The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by informer-gen. DO NOT EDIT.
+
+package v1alpha1
+
+import (
+	internalinterfaces "k8s.io/client-go/informers/internalinterfaces"
+)
+
+// Interface provides access to all the informers in this group version.
+type Interface interface {
+	// FlowSchemas returns a FlowSchemaInformer.
+	FlowSchemas() FlowSchemaInformer
+	// PriorityLevelConfigurations returns a PriorityLevelConfigurationInformer.
+	PriorityLevelConfigurations() PriorityLevelConfigurationInformer
+}
+
+type version struct {
+	factory          internalinterfaces.SharedInformerFactory
+	namespace        string
+	tweakListOptions internalinterfaces.TweakListOptionsFunc
+}
+
+// New returns a new Interface.
+func New(f internalinterfaces.SharedInformerFactory, namespace string, tweakListOptions internalinterfaces.TweakListOptionsFunc) Interface {
+	return &version{factory: f, namespace: namespace, tweakListOptions: tweakListOptions}
+}
+
+// FlowSchemas returns a FlowSchemaInformer.
+func (v *version) FlowSchemas() FlowSchemaInformer {
+	return &flowSchemaInformer{factory: v.factory, tweakListOptions: v.tweakListOptions}
+}
+
+// PriorityLevelConfigurations returns a PriorityLevelConfigurationInformer.
+func (v *version) PriorityLevelConfigurations() PriorityLevelConfigurationInformer {
+	return &priorityLevelConfigurationInformer{factory: v.factory, tweakListOptions: v.tweakListOptions}
+}

vendor/k8s.io/client-go/informers/flowcontrol/v1alpha1/prioritylevelconfiguration.go

@@ -0,0 +1,88 @@
+/*
+Copyright The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by informer-gen. DO NOT EDIT.
+
+package v1alpha1
+
+import (
+	time "time"
+
+	flowcontrolv1alpha1 "k8s.io/api/flowcontrol/v1alpha1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	runtime "k8s.io/apimachinery/pkg/runtime"
+	watch "k8s.io/apimachinery/pkg/watch"
+	internalinterfaces "k8s.io/client-go/informers/internalinterfaces"
+	kubernetes "k8s.io/client-go/kubernetes"
+	v1alpha1 "k8s.io/client-go/listers/flowcontrol/v1alpha1"
+	cache "k8s.io/client-go/tools/cache"
+)
+
+// PriorityLevelConfigurationInformer provides access to a shared informer and lister for
+// PriorityLevelConfigurations.
+type PriorityLevelConfigurationInformer interface {
+	Informer() cache.SharedIndexInformer
+	Lister() v1alpha1.PriorityLevelConfigurationLister
+}
+
+type priorityLevelConfigurationInformer struct {
+	factory          internalinterfaces.SharedInformerFactory
+	tweakListOptions internalinterfaces.TweakListOptionsFunc
+}
+
+// NewPriorityLevelConfigurationInformer constructs a new informer for PriorityLevelConfiguration type.
+// Always prefer using an informer factory to get a shared informer instead of getting an independent
+// one. This reduces memory footprint and number of connections to the server.
+func NewPriorityLevelConfigurationInformer(client kubernetes.Interface, resyncPeriod time.Duration, indexers cache.Indexers) cache.SharedIndexInformer {
+	return NewFilteredPriorityLevelConfigurationInformer(client, resyncPeriod, indexers, nil)
+}
+
+// NewFilteredPriorityLevelConfigurationInformer constructs a new informer for PriorityLevelConfiguration type.
+// Always prefer using an informer factory to get a shared informer instead of getting an independent
+// one. This reduces memory footprint and number of connections to the server.
+func NewFilteredPriorityLevelConfigurationInformer(client kubernetes.Interface, resyncPeriod time.Duration, indexers cache.Indexers, tweakListOptions internalinterfaces.TweakListOptionsFunc) cache.SharedIndexInformer {
+	return cache.NewSharedIndexInformer(
+		&cache.ListWatch{
+			ListFunc: func(options v1.ListOptions) (runtime.Object, error) {
+				if tweakListOptions != nil {
+					tweakListOptions(&options)
+				}
+				return client.FlowcontrolV1alpha1().PriorityLevelConfigurations().List(options)
+			},
+			WatchFunc: func(options v1.ListOptions) (watch.Interface, error) {
+				if tweakListOptions != nil {
+					tweakListOptions(&options)
+				}
+				return client.FlowcontrolV1alpha1().PriorityLevelConfigurations().Watch(options)
+			},
+		},
+		&flowcontrolv1alpha1.PriorityLevelConfiguration{},
+		resyncPeriod,
+		indexers,
+	)
+}
+
+func (f *priorityLevelConfigurationInformer) defaultInformer(client kubernetes.Interface, resyncPeriod time.Duration) cache.SharedIndexInformer {
+	return NewFilteredPriorityLevelConfigurationInformer(client, resyncPeriod, cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc}, f.tweakListOptions)
+}
+
+func (f *priorityLevelConfigurationInformer) Informer() cache.SharedIndexInformer {
+	return f.factory.InformerFor(&flowcontrolv1alpha1.PriorityLevelConfiguration{}, f.defaultInformer)
+}
+
+func (f *priorityLevelConfigurationInformer) Lister() v1alpha1.PriorityLevelConfigurationLister {
+	return v1alpha1.NewPriorityLevelConfigurationLister(f.Informer().GetIndexer())
+}