K8s: Add subresource to the example apiserver (#78030)

.github/CODEOWNERS

@@ -138,6 +138,7 @@
 /pkg/services/validations/ @grafana/backend-platform
 /pkg/setting/ @grafana/backend-platform
 /pkg/tests/ @grafana/backend-platform
+/pkg/tests/apis/ @grafana/grafana-app-platform-squad
 /pkg/tests/api/correlations/ @grafana/explore-squad
 /pkg/tsdb/grafanads/ @grafana/backend-platform
 /pkg/tsdb/intervalv2/ @grafana/backend-platform
@@ -603,6 +604,7 @@ embed.go @grafana/grafana-as-code
 /pkg/kinds/ @grafana/grafana-as-code
 /pkg/cuectx/ @grafana/grafana-as-code
 /pkg/registry/ @grafana/grafana-as-code
+/pkg/registry/apis/ @grafana/grafana-app-platform-squad
 /pkg/codegen/ @grafana/grafana-as-code
 /pkg/kinds/*/*_gen.go @grafana/grafana-as-code
 /pkg/registry/corekind/ @grafana/grafana-as-code

pkg/apis/example/v0alpha1/types.go

@@ -4,10 +4,12 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
+// Mirrors the info exposed in "github.com/grafana/grafana/pkg/setting"
 // +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
 type RuntimeInfo struct {
 	metav1.TypeMeta `json:",inline"`
 
+	// Unix timestamp when the process started
 	StartupTime int64 `json:"startupTime,omitempty"`
 
 	BuildVersion          string `json:"buildVersion,omitempty"`
@@ -18,3 +20,28 @@ type RuntimeInfo struct {
 	IsEnterprise          bool   `json:"enterprise,omitempty"`
 	Packaging             string `json:"packaging,omitempty"`
 }
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+type DummyResource struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	Spec string `json:"spec,omitempty"`
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+type DummyResourceList struct {
+	metav1.TypeMeta `json:",inline"`
+	// +optional
+	metav1.ListMeta `json:"metadata,omitempty"`
+
+	Items []DummyResource `json:"items,omitempty"`
+}
+
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+type DummySubresource struct {
+	metav1.TypeMeta `json:",inline"`
+
+	// add subresource info here
+	Info string `json:"info,omitempty"`
+}

pkg/apis/example/v0alpha1/zz_generated.deepcopy.go

@@ -11,6 +11,90 @@ import (
 	runtime "k8s.io/apimachinery/pkg/runtime"
 )
 
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *DummyResource) DeepCopyInto(out *DummyResource) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ObjectMeta.DeepCopyInto(&out.ObjectMeta)
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new DummyResource.
+func (in *DummyResource) DeepCopy() *DummyResource {
+	if in == nil {
+		return nil
+	}
+	out := new(DummyResource)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *DummyResource) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *DummyResourceList) DeepCopyInto(out *DummyResourceList) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ListMeta.DeepCopyInto(&out.ListMeta)
+	if in.Items != nil {
+		in, out := &in.Items, &out.Items
+		*out = make([]DummyResource, len(*in))
+		for i := range *in {
+			(*in)[i].DeepCopyInto(&(*out)[i])
+		}
+	}
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new DummyResourceList.
+func (in *DummyResourceList) DeepCopy() *DummyResourceList {
+	if in == nil {
+		return nil
+	}
+	out := new(DummyResourceList)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *DummyResourceList) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *DummySubresource) DeepCopyInto(out *DummySubresource) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new DummySubresource.
+func (in *DummySubresource) DeepCopy() *DummySubresource {
+	if in == nil {
+		return nil
+	}
+	out := new(DummySubresource)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *DummySubresource) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}
+
 // DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
 func (in *RuntimeInfo) DeepCopyInto(out *RuntimeInfo) {
 	*out = *in

pkg/apis/example/v0alpha1/zz_generated.defaults.go

@@ -0,0 +1,19 @@
+//go:build !ignore_autogenerated
+// +build !ignore_autogenerated
+
+// SPDX-License-Identifier: AGPL-3.0-only
+
+// Code generated by defaulter-gen. DO NOT EDIT.
+
+package v0alpha1
+
+import (
+	runtime "k8s.io/apimachinery/pkg/runtime"
+)
+
+// RegisterDefaults adds defaulters functions to the given scheme.
+// Public to allow building arbitrary schemes.
+// All generated defaulters are covering - they call all nested defaulters.
+func RegisterDefaults(scheme *runtime.Scheme) error {
+	return nil
+}

pkg/apis/example/v0alpha1/zz_generated.openapi..go

@@ -1,89 +0,0 @@
-package v0alpha1
-
-import (
-	common "k8s.io/kube-openapi/pkg/common"
-	spec "k8s.io/kube-openapi/pkg/validation/spec"
-)
-
-// NOTE: this must match the golang fully qualified name!
-const kindKey = "github.com/grafana/grafana/pkg/apis/example/v0alpha1.RuntimeInfo"
-
-func GetOpenAPIDefinitions(ref common.ReferenceCallback) map[string]common.OpenAPIDefinition {
-	return map[string]common.OpenAPIDefinition{
-		kindKey: schema_pkg_apis_example_v0alpha1_RuntimeInfo(ref),
-	}
-}
-
-func schema_pkg_apis_example_v0alpha1_RuntimeInfo(ref common.ReferenceCallback) common.OpenAPIDefinition {
-	return common.OpenAPIDefinition{
-		Schema: spec.Schema{
-			SchemaProps: spec.SchemaProps{
-				Type: []string{"object"},
-				Properties: map[string]spec.Schema{
-					"kind": {
-						SchemaProps: spec.SchemaProps{
-							Description: "Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds",
-							Type:        []string{"string"},
-							Format:      "",
-						},
-					},
-					"apiVersion": {
-						SchemaProps: spec.SchemaProps{
-							Description: "APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources",
-							Type:        []string{"string"},
-							Format:      "",
-						},
-					},
-					"startupTime": {
-						SchemaProps: spec.SchemaProps{
-							Type:   []string{"integer"},
-							Format: "int64",
-						},
-					},
-					"buildVersion": {
-						SchemaProps: spec.SchemaProps{
-							Type:   []string{"string"},
-							Format: "",
-						},
-					},
-					"buildCommit": {
-						SchemaProps: spec.SchemaProps{
-							Type:   []string{"string"},
-							Format: "",
-						},
-					},
-					"enterpriseBuildCommit": {
-						SchemaProps: spec.SchemaProps{
-							Type:   []string{"string"},
-							Format: "",
-						},
-					},
-					"buildBranch": {
-						SchemaProps: spec.SchemaProps{
-							Type:   []string{"string"},
-							Format: "",
-						},
-					},
-					"buildStamp": {
-						SchemaProps: spec.SchemaProps{
-							Type:   []string{"integer"},
-							Format: "int64",
-						},
-					},
-					"enterprise": {
-						SchemaProps: spec.SchemaProps{
-							Type:   []string{"boolean"},
-							Format: "",
-						},
-					},
-					"packaging": {
-						SchemaProps: spec.SchemaProps{
-							Type:   []string{"string"},
-							Format: "",
-						},
-					},
-				},
-			},
-		},
-	}
-}

pkg/apis/example/v0alpha1/zz_generated.openapi.go

@@ -0,0 +1,220 @@
+//go:build !ignore_autogenerated
+// +build !ignore_autogenerated
+
+// SPDX-License-Identifier: AGPL-3.0-only
+
+// Code generated by openapi-gen. DO NOT EDIT.
+
+// This file was autogenerated by openapi-gen. Do not edit it manually!
+
+package v0alpha1
+
+import (
+	common "k8s.io/kube-openapi/pkg/common"
+	spec "k8s.io/kube-openapi/pkg/validation/spec"
+)
+
+func GetOpenAPIDefinitions(ref common.ReferenceCallback) map[string]common.OpenAPIDefinition {
+	return map[string]common.OpenAPIDefinition{
+		"github.com/grafana/grafana/pkg/apis/example/v0alpha1.DummyResource":     schema_pkg_apis_example_v0alpha1_DummyResource(ref),
+		"github.com/grafana/grafana/pkg/apis/example/v0alpha1.DummyResourceList": schema_pkg_apis_example_v0alpha1_DummyResourceList(ref),
+		"github.com/grafana/grafana/pkg/apis/example/v0alpha1.DummySubresource":  schema_pkg_apis_example_v0alpha1_DummySubresource(ref),
+		"github.com/grafana/grafana/pkg/apis/example/v0alpha1.RuntimeInfo":       schema_pkg_apis_example_v0alpha1_RuntimeInfo(ref),
+	}
+}
+
+func schema_pkg_apis_example_v0alpha1_DummyResource(ref common.ReferenceCallback) common.OpenAPIDefinition {
+	return common.OpenAPIDefinition{
+		Schema: spec.Schema{
+			SchemaProps: spec.SchemaProps{
+				Type: []string{"object"},
+				Properties: map[string]spec.Schema{
+					"kind": {
+						SchemaProps: spec.SchemaProps{
+							Description: "Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+					"apiVersion": {
+						SchemaProps: spec.SchemaProps{
+							Description: "APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+					"metadata": {
+						SchemaProps: spec.SchemaProps{
+							Default: map[string]interface{}{},
+							Ref:     ref("k8s.io/apimachinery/pkg/apis/meta/v1.ObjectMeta"),
+						},
+					},
+					"spec": {
+						SchemaProps: spec.SchemaProps{
+							Type:   []string{"string"},
+							Format: "",
+						},
+					},
+				},
+			},
+		},
+		Dependencies: []string{
+			"k8s.io/apimachinery/pkg/apis/meta/v1.ObjectMeta"},
+	}
+}
+
+func schema_pkg_apis_example_v0alpha1_DummyResourceList(ref common.ReferenceCallback) common.OpenAPIDefinition {
+	return common.OpenAPIDefinition{
+		Schema: spec.Schema{
+			SchemaProps: spec.SchemaProps{
+				Type: []string{"object"},
+				Properties: map[string]spec.Schema{
+					"kind": {
+						SchemaProps: spec.SchemaProps{
+							Description: "Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+					"apiVersion": {
+						SchemaProps: spec.SchemaProps{
+							Description: "APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+					"metadata": {
+						SchemaProps: spec.SchemaProps{
+							Default: map[string]interface{}{},
+							Ref:     ref("k8s.io/apimachinery/pkg/apis/meta/v1.ListMeta"),
+						},
+					},
+					"items": {
+						SchemaProps: spec.SchemaProps{
+							Type: []string{"array"},
+							Items: &spec.SchemaOrArray{
+								Schema: &spec.Schema{
+									SchemaProps: spec.SchemaProps{
+										Default: map[string]interface{}{},
+										Ref:     ref("github.com/grafana/grafana/pkg/apis/example/v0alpha1.DummyResource"),
+									},
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+		Dependencies: []string{
+			"github.com/grafana/grafana/pkg/apis/example/v0alpha1.DummyResource", "k8s.io/apimachinery/pkg/apis/meta/v1.ListMeta"},
+	}
+}
+
+func schema_pkg_apis_example_v0alpha1_DummySubresource(ref common.ReferenceCallback) common.OpenAPIDefinition {
+	return common.OpenAPIDefinition{
+		Schema: spec.Schema{
+			SchemaProps: spec.SchemaProps{
+				Type: []string{"object"},
+				Properties: map[string]spec.Schema{
+					"kind": {
+						SchemaProps: spec.SchemaProps{
+							Description: "Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+					"apiVersion": {
+						SchemaProps: spec.SchemaProps{
+							Description: "APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+					"info": {
+						SchemaProps: spec.SchemaProps{
+							Description: "add subresource info here",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+				},
+			},
+		},
+	}
+}
+
+func schema_pkg_apis_example_v0alpha1_RuntimeInfo(ref common.ReferenceCallback) common.OpenAPIDefinition {
+	return common.OpenAPIDefinition{
+		Schema: spec.Schema{
+			SchemaProps: spec.SchemaProps{
+				Description: "Mirrors the info exposed in \"github.com/grafana/grafana/pkg/setting\"",
+				Type:        []string{"object"},
+				Properties: map[string]spec.Schema{
+					"kind": {
+						SchemaProps: spec.SchemaProps{
+							Description: "Kind is a string value representing the REST resource this object represents. Servers may infer this from the endpoint the client submits requests to. Cannot be updated. In CamelCase. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#types-kinds",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+					"apiVersion": {
+						SchemaProps: spec.SchemaProps{
+							Description: "APIVersion defines the versioned schema of this representation of an object. Servers should convert recognized schemas to the latest internal value, and may reject unrecognized values. More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#resources",
+							Type:        []string{"string"},
+							Format:      "",
+						},
+					},
+					"startupTime": {
+						SchemaProps: spec.SchemaProps{
+							Description: "Unix timestamp when the process started",
+							Type:        []string{"integer"},
+							Format:      "int64",
+						},
+					},
+					"buildVersion": {
+						SchemaProps: spec.SchemaProps{
+							Type:   []string{"string"},
+							Format: "",
+						},
+					},
+					"buildCommit": {
+						SchemaProps: spec.SchemaProps{
+							Type:   []string{"string"},
+							Format: "",
+						},
+					},
+					"enterpriseBuildCommit": {
+						SchemaProps: spec.SchemaProps{
+							Type:   []string{"string"},
+							Format: "",
+						},
+					},
+					"buildBranch": {
+						SchemaProps: spec.SchemaProps{
+							Type:   []string{"string"},
+							Format: "",
+						},
+					},
+					"buildStamp": {
+						SchemaProps: spec.SchemaProps{
+							Type:   []string{"integer"},
+							Format: "int64",
+						},
+					},
+					"enterprise": {
+						SchemaProps: spec.SchemaProps{
+							Type:   []string{"boolean"},
+							Format: "",
+						},
+					},
+					"packaging": {
+						SchemaProps: spec.SchemaProps{
+							Type:   []string{"string"},
+							Format: "",
+						},
+					},
+				},
+			},
+		},
+	}
+}

pkg/registry/apis/example/dummy_storage.go

@@ -0,0 +1,118 @@
+package example
+
+import (
+	"context"
+	"fmt"
+	"slices"
+
+	"k8s.io/apimachinery/pkg/apis/meta/internalversion"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	genericregistry "k8s.io/apiserver/pkg/registry/generic/registry"
+	"k8s.io/apiserver/pkg/registry/rest"
+
+	example "github.com/grafana/grafana/pkg/apis/example/v0alpha1"
+	grafanarequest "github.com/grafana/grafana/pkg/services/grafana-apiserver/endpoints/request"
+	grafanaregistry "github.com/grafana/grafana/pkg/services/grafana-apiserver/registry/generic"
+)
+
+var (
+	_ rest.Storage              = (*dummyStorage)(nil)
+	_ rest.Scoper               = (*dummyStorage)(nil)
+	_ rest.SingularNameProvider = (*dummyStorage)(nil)
+	_ rest.Getter               = (*dummyStorage)(nil)
+	_ rest.Lister               = (*dummyStorage)(nil)
+)
+
+type dummyStorage struct {
+	store             *genericregistry.Store
+	names             []string
+	creationTimestamp metav1.Time
+}
+
+func newDummyStorage(gv schema.GroupVersion, scheme *runtime.Scheme, names ...string) *dummyStorage {
+	strategy := grafanaregistry.NewStrategy(scheme)
+	store := &genericregistry.Store{
+		NewFunc:                   func() runtime.Object { return &example.DummyResource{} },     // getter not supported
+		NewListFunc:               func() runtime.Object { return &example.DummyResourceList{} }, // both list and get return the same thing
+		PredicateFunc:             grafanaregistry.Matcher,
+		DefaultQualifiedResource:  gv.WithResource("dummy").GroupResource(),
+		SingularQualifiedResource: gv.WithResource("dummy").GroupResource(),
+		CreateStrategy:            strategy,
+		UpdateStrategy:            strategy,
+		DeleteStrategy:            strategy,
+	}
+	store.TableConvertor = rest.NewDefaultTableConvertor(store.DefaultQualifiedResource)
+
+	return &dummyStorage{
+		store:             store,
+		names:             names,
+		creationTimestamp: metav1.Now(),
+	}
+}
+
+func (s *dummyStorage) New() runtime.Object {
+	return s.store.New()
+}
+
+func (s *dummyStorage) Destroy() {}
+
+func (s *dummyStorage) NamespaceScoped() bool {
+	return true
+}
+
+func (s *dummyStorage) GetSingularName() string {
+	return "dummy"
+}
+
+func (s *dummyStorage) NewList() runtime.Object {
+	return s.store.NewListFunc()
+}
+
+func (s *dummyStorage) ConvertToTable(ctx context.Context, object runtime.Object, tableOptions runtime.Object) (*metav1.Table, error) {
+	return s.store.TableConvertor.ConvertToTable(ctx, object, tableOptions)
+}
+
+func (s *dummyStorage) Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error) {
+	info, err := grafanarequest.NamespaceInfoFrom(ctx, true)
+	if err != nil {
+		return nil, err
+	}
+
+	idx := slices.Index(s.names, name)
+	if idx < 0 {
+		return nil, fmt.Errorf("dummy not found")
+	}
+
+	return &example.DummyResource{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:              name,
+			Namespace:         info.Value,
+			CreationTimestamp: s.creationTimestamp,
+			ResourceVersion:   "1",
+		},
+		Spec: fmt.Sprintf("dummy: %s", name),
+	}, nil
+}
+
+func (s *dummyStorage) List(ctx context.Context, options *internalversion.ListOptions) (runtime.Object, error) {
+	info, err := grafanarequest.NamespaceInfoFrom(ctx, true)
+	if err != nil {
+		return nil, err
+	}
+
+	res := &example.DummyResourceList{}
+	for _, name := range s.names {
+		res.Items = append(res.Items, example.DummyResource{
+			ObjectMeta: metav1.ObjectMeta{
+				Name:              name,
+				Namespace:         info.Value,
+				CreationTimestamp: s.creationTimestamp,
+				ResourceVersion:   "1",
+			},
+			Spec: fmt.Sprintf("dummy: %s", name),
+		})
+	}
+	return res, nil
+}

pkg/registry/apis/example/register.go

@@ -33,27 +33,50 @@ var _ grafanaapiserver.APIGroupBuilder = (*TestingAPIBuilder)(nil)
 // This is used just so wire has something unique to return
 type TestingAPIBuilder struct {
 	codecs serializer.CodecFactory
+	gv     schema.GroupVersion
 }
 
 func RegisterAPIService(features featuremgmt.FeatureToggles, apiregistration grafanaapiserver.APIRegistrar) *TestingAPIBuilder {
 	if !features.IsEnabled(featuremgmt.FlagGrafanaAPIServerWithExperimentalAPIs) {
 		return nil // skip registration unless opting into experimental apis
 	}
-	builder := &TestingAPIBuilder{}
+	builder := &TestingAPIBuilder{
+		gv: schema.GroupVersion{Group: GroupName, Version: VersionID},
+	}
 	apiregistration.RegisterAPI(builder)
 	return builder
 }
 
 func (b *TestingAPIBuilder) GetGroupVersion() schema.GroupVersion {
-	return SchemeGroupVersion
+	return b.gv
+}
+
+func addKnownTypes(scheme *runtime.Scheme, gv schema.GroupVersion) {
+	scheme.AddKnownTypes(gv,
+		&example.RuntimeInfo{},
+		&example.DummyResource{},
+		&example.DummyResourceList{},
+		&example.DummySubresource{},
+	)
 }
 
 func (b *TestingAPIBuilder) InstallSchema(scheme *runtime.Scheme) error {
-	err := AddToScheme(scheme)
-	if err != nil {
-		return err
-	}
-	return scheme.SetVersionPriority(SchemeGroupVersion)
+	addKnownTypes(scheme, b.gv)
+
+	// Link this version to the internal representation.
+	// This is used for server-side-apply (PATCH), and avoids the error:
+	//   "no kind is registered for the type"
+	addKnownTypes(scheme, schema.GroupVersion{
+		Group:   b.gv.Group,
+		Version: runtime.APIVersionInternal,
+	})
+
+	// If multiple versions exist, then register conversions from zz_generated.conversion.go
+	// if err := playlist.RegisterConversions(scheme); err != nil {
+	//   return err
+	// }
+	metav1.AddToGroupVersion(scheme, b.gv)
+	return scheme.SetVersionPriority(b.gv)
 }
 
 func (b *TestingAPIBuilder) GetAPIGroupInfo(
@@ -61,11 +84,14 @@ func (b *TestingAPIBuilder) GetAPIGroupInfo(
 	codecs serializer.CodecFactory, // pointer?
 	optsGetter generic.RESTOptionsGetter,
 ) (*genericapiserver.APIGroupInfo, error) {
-	apiGroupInfo := genericapiserver.NewDefaultAPIGroupInfo(GroupName, scheme, metav1.ParameterCodec, codecs)
-	storage := map[string]rest.Storage{}
-	storage["runtime"] = newDeploymentInfoStorage()
-	apiGroupInfo.VersionedResourcesStorageMap[VersionID] = storage
 	b.codecs = codecs
+	apiGroupInfo := genericapiserver.NewDefaultAPIGroupInfo(GroupName, scheme, metav1.ParameterCodec, codecs)
+
+	storage := map[string]rest.Storage{}
+	storage["runtime"] = newDeploymentInfoStorage(b.gv, scheme)
+	storage["dummy"] = newDummyStorage(b.gv, scheme, "test1", "test2", "test3")
+	storage["dummy/sub"] = &dummySubresourceREST{}
+	apiGroupInfo.VersionedResourcesStorageMap[VersionID] = storage
 	return &apiGroupInfo, nil
 }
 
@@ -170,29 +196,3 @@ func (b *TestingAPIBuilder) GetAPIRoutes() *grafanaapiserver.APIRoutes {
 		},
 	}
 }
-
-// SchemeGroupVersion is group version used to register these objects
-var SchemeGroupVersion = schema.GroupVersion{Group: GroupName, Version: VersionID}
-
-// Resource takes an unqualified resource and returns a Group qualified GroupResource
-func Resource(resource string) schema.GroupResource {
-	return SchemeGroupVersion.WithResource(resource).GroupResource()
-}
-
-var (
-	// SchemeBuilder points to a list of functions added to Scheme.
-	SchemeBuilder      = runtime.NewSchemeBuilder(addKnownTypes)
-	localSchemeBuilder = &SchemeBuilder
-	// AddToScheme is a common registration function for mapping packaged scoped group & version keys to a scheme.
-	AddToScheme = localSchemeBuilder.AddToScheme
-)
-
-// Adds the list of known types to the given scheme.
-func addKnownTypes(scheme *runtime.Scheme) error {
-	scheme.AddKnownTypes(SchemeGroupVersion,
-		&example.RuntimeInfo{},
-	)
-
-	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
-	return scheme.SetVersionPriority(SchemeGroupVersion)
-}

pkg/registry/apis/example/storage.go

@@ -7,25 +7,43 @@ import (
 	"k8s.io/apimachinery/pkg/apis/meta/internalversion"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	genericregistry "k8s.io/apiserver/pkg/registry/generic/registry"
 	"k8s.io/apiserver/pkg/registry/rest"
 
 	example "github.com/grafana/grafana/pkg/apis/example/v0alpha1"
+	grafanaregistry "github.com/grafana/grafana/pkg/services/grafana-apiserver/registry/generic"
 	"github.com/grafana/grafana/pkg/setting"
 )
 
 var (
+	_ rest.Storage              = (*staticStorage)(nil)
 	_ rest.Scoper               = (*staticStorage)(nil)
 	_ rest.SingularNameProvider = (*staticStorage)(nil)
 	_ rest.Lister               = (*staticStorage)(nil)
-	_ rest.Storage              = (*staticStorage)(nil)
 )
 
 type staticStorage struct {
-	info example.RuntimeInfo
+	Store *genericregistry.Store
+	info  example.RuntimeInfo
 }
 
-func newDeploymentInfoStorage() *staticStorage {
+func newDeploymentInfoStorage(gv schema.GroupVersion, scheme *runtime.Scheme) *staticStorage {
+	strategy := grafanaregistry.NewStrategy(scheme)
+	store := &genericregistry.Store{
+		NewFunc:                   func() runtime.Object { return &example.RuntimeInfo{} }, // getter not supported
+		NewListFunc:               func() runtime.Object { return &example.RuntimeInfo{} }, // both list and get return the same thing
+		PredicateFunc:             grafanaregistry.Matcher,
+		DefaultQualifiedResource:  gv.WithResource("runtime").GroupResource(),
+		SingularQualifiedResource: gv.WithResource("runtime").GroupResource(),
+		CreateStrategy:            strategy,
+		UpdateStrategy:            strategy,
+		DeleteStrategy:            strategy,
+	}
+	store.TableConvertor = rest.NewDefaultTableConvertor(store.DefaultQualifiedResource)
+
 	return &staticStorage{
+		Store: store,
 		info: example.RuntimeInfo{
 			TypeMeta: metav1.TypeMeta{
 				APIVersion: APIVersion,
@@ -44,7 +62,7 @@ func newDeploymentInfoStorage() *staticStorage {
 }
 
 func (s *staticStorage) New() runtime.Object {
-	return &example.RuntimeInfo{}
+	return s.Store.New()
 }
 
 func (s *staticStorage) Destroy() {}
@@ -58,11 +76,11 @@ func (s *staticStorage) GetSingularName() string {
 }
 
 func (s *staticStorage) NewList() runtime.Object {
-	return &example.RuntimeInfo{}
+	return s.Store.NewListFunc()
 }
 
 func (s *staticStorage) ConvertToTable(ctx context.Context, object runtime.Object, tableOptions runtime.Object) (*metav1.Table, error) {
-	return rest.NewDefaultTableConvertor(Resource("runtime")).ConvertToTable(ctx, object, tableOptions)
+	return s.Store.TableConvertor.ConvertToTable(ctx, object, tableOptions)
 }
 
 func (s *staticStorage) List(ctx context.Context, options *internalversion.ListOptions) (runtime.Object, error) {

pkg/registry/apis/example/subresource.go

@@ -0,0 +1,54 @@
+package example
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apiserver/pkg/registry/rest"
+
+	example "github.com/grafana/grafana/pkg/apis/example/v0alpha1"
+	"github.com/grafana/grafana/pkg/infra/appcontext"
+	"github.com/grafana/grafana/pkg/services/grafana-apiserver/endpoints/request"
+)
+
+type dummySubresourceREST struct{}
+
+var _ = rest.Connecter(&dummySubresourceREST{})
+
+func (r *dummySubresourceREST) New() runtime.Object {
+	return &example.DummySubresource{}
+}
+
+func (r *dummySubresourceREST) Destroy() {
+}
+
+func (r *dummySubresourceREST) ConnectMethods() []string {
+	return []string{"GET"}
+}
+
+func (r *dummySubresourceREST) NewConnectOptions() (runtime.Object, bool, string) {
+	return nil, false, "" // true means you can use the trailing path as a variable
+}
+
+func (r *dummySubresourceREST) Connect(ctx context.Context, name string, opts runtime.Object, responder rest.Responder) (http.Handler, error) {
+	info, err := request.NamespaceInfoFrom(ctx, true)
+	if err != nil {
+		return nil, err
+	}
+
+	user, err := appcontext.User(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	// This response object format is negotiated by k8s
+	dummy := &example.DummySubresource{
+		Info: fmt.Sprintf("%s/%s", info.Value, user.Login),
+	}
+
+	return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		responder.Object(http.StatusOK, dummy)
+	}), nil
+}

pkg/services/grafana-apiserver/common.go

@@ -42,16 +42,12 @@ type APIRouteHandler struct {
 	Handler http.HandlerFunc // when Level = resource, the resource will be available in context
 }
 
-// APIRoutes define the
+// APIRoutes define explicit HTTP handlers in an apiserver
+// TBD: is this actually necessary -- there may be more k8s native options for this
 type APIRoutes struct {
 	// Root handlers are registered directly after the apiVersion identifier
 	Root []APIRouteHandler
 
 	// Namespace handlers are mounted under the namespace
 	Namespace []APIRouteHandler
-
-	// Resource routes behave the same as pod/logs
-	// it looks like a sub-resource, however the response is backed directly by an http handler
-	// The current resource can be fetched through context
-	Resource map[string]APIRouteHandler
 }

pkg/services/grafana-apiserver/request_handler.go

@@ -71,22 +71,6 @@ func getAPIHandler(delegateHandler http.Handler, restConfig *restclient.Config,
 			sub.HandleFunc(route.Path, route.Handler).
 				Methods(methods...)
 		}
-
-		//	getter := makeGetter(restConfig)
-		for resource, route := range routes.Resource {
-			err = validPath(route.Path)
-			if err != nil {
-				return nil, err
-			}
-			fmt.Printf("TODO: %s/%v\n", resource, route)
-
-			// get a client for that resource kind
-			//getter := makeGetter(restConfig)
-
-			useful = true
-			// sub.HandleFunc(v.Slug, SubresourceHandlerWrapper(v.Handler, getter)).
-			// 	Methods(methods...)
-		}
 	}
 
 	if !useful {
@@ -184,12 +168,6 @@ func getOpenAPIPostProcessor(builders []APIGroupBuilder) func(*spec3.OpenAPI) (*
 					}
 				}
 
-				for resource, route := range routes.Resource {
-					copy.Paths.Paths[prefix+"/namespaces/{namespace}/"+resource+"{name}"+route.Path] = &spec3.Path{
-						PathProps: *route.Spec,
-					}
-				}
-
 				return &copy, nil
 			}
 		}

pkg/tests/apis/example/example_test.go

@@ -0,0 +1,167 @@
+package playlist
+
+import (
+	"context"
+	"encoding/json"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+
+	"github.com/grafana/grafana/pkg/services/featuremgmt"
+	"github.com/grafana/grafana/pkg/tests/apis"
+	"github.com/grafana/grafana/pkg/tests/testinfra"
+)
+
+func TestExampleApp(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test")
+	}
+	helper := apis.NewK8sTestHelper(t, testinfra.GrafanaOpts{
+		AppModeProduction: true, // do not start extra port 6443
+		DisableAnonymous:  true,
+		EnableFeatureToggles: []string{
+			featuremgmt.FlagGrafanaAPIServer,
+			featuremgmt.FlagGrafanaAPIServerWithExperimentalAPIs, // Required to start the example service
+		},
+	})
+
+	t.Run("Check runtime info resource", func(t *testing.T) {
+		// Resource is not namespaced!
+		client := helper.Org1.Admin.Client.Resource(schema.GroupVersionResource{
+			Group:    "example.grafana.app",
+			Version:  "v0alpha1",
+			Resource: "runtime",
+		})
+		rsp, err := client.List(context.Background(), metav1.ListOptions{})
+		require.NoError(t, err)
+
+		v, ok := rsp.Object["startupTime"].(int64)
+		require.True(t, ok)
+		require.Greater(t, v, time.Now().Add(-1*time.Hour).UnixMilli()) // should be within the last hour
+	})
+
+	t.Run("Check discovery client", func(t *testing.T) {
+		disco := helper.NewDiscoveryClient()
+		resources, err := disco.ServerResourcesForGroupVersion("example.grafana.app/v0alpha1")
+		require.NoError(t, err)
+
+		v1Disco, err := json.MarshalIndent(resources, "", "  ")
+		require.NoError(t, err)
+		//	fmt.Printf("%s", string(v1Disco))
+
+		require.JSONEq(t, `{
+			"kind": "APIResourceList",
+			"apiVersion": "v1",
+			"groupVersion": "example.grafana.app/v0alpha1",
+			"resources": [
+			  {
+				"name": "dummy",
+				"singularName": "dummy",
+				"namespaced": true,
+				"kind": "DummyResource",
+				"verbs": [
+				  "get",
+				  "list"
+				]
+			  },
+			  {
+				"name": "dummy/sub",
+				"singularName": "",
+				"namespaced": true,
+				"kind": "DummySubresource",
+				"verbs": [
+				  "get"
+				]
+			  },
+			  {
+				"name": "runtime",
+				"singularName": "runtime",
+				"namespaced": false,
+				"kind": "RuntimeInfo",
+				"verbs": [
+				  "list"
+				]
+			  }
+			]
+		  }`, string(v1Disco))
+
+		//fmt.Printf("%s", string(v1Disco))
+		require.JSONEq(t, `[
+			{
+			  "version": "v0alpha1",
+			  "freshness": "Current",
+			  "resources": [
+				{
+				  "resource": "dummy",
+				  "responseKind": {
+					"group": "",
+					"kind": "DummyResource",
+					"version": ""
+				  },
+				  "scope": "Namespaced",
+				  "singularResource": "dummy",
+				  "subresources": [
+					{
+					  "responseKind": {
+						"group": "",
+						"kind": "DummySubresource",
+						"version": ""
+					  },
+					  "subresource": "sub",
+					  "verbs": [
+						"get"
+					  ]
+					}
+				  ],
+				  "verbs": [
+					"get",
+					"list"
+				  ]
+				},
+				{
+				  "resource": "runtime",
+				  "responseKind": {
+					"group": "",
+					"kind": "RuntimeInfo",
+					"version": ""
+				  },
+				  "scope": "Cluster",
+				  "singularResource": "runtime",
+				  "verbs": [
+					"list"
+				  ]
+				}
+			  ]
+			}
+		  ]`, helper.GetGroupVersionInfoJSON("example.grafana.app"))
+	})
+
+	t.Run("Check dummy with subresource", func(t *testing.T) {
+		client := helper.Org1.Viewer.Client.Resource(schema.GroupVersionResource{
+			Group:    "example.grafana.app",
+			Version:  "v0alpha1",
+			Resource: "dummy",
+		}).Namespace("default")
+		rsp, err := client.Get(context.Background(), "test2", metav1.GetOptions{})
+		require.NoError(t, err)
+
+		require.Equal(t, "dummy: test2", rsp.Object["spec"])
+		require.Equal(t, "DummyResource", rsp.GetObjectKind().GroupVersionKind().Kind)
+
+		// Now a sub-resource
+		rsp, err = client.Get(context.Background(), "test2", metav1.GetOptions{}, "sub")
+		require.NoError(t, err)
+
+		raw, err := json.MarshalIndent(rsp, "", "  ")
+		require.NoError(t, err)
+		//fmt.Printf("%s", string(raw))
+		require.JSONEq(t, `{
+			"apiVersion": "example.grafana.app/v0alpha1",
+			"kind": "DummySubresource",
+			"info": "default/viewer-1"
+		  }`, string(raw))
+	})
+}

pkg/tests/apis/helper.go

@@ -19,6 +19,7 @@ import (
 	"k8s.io/apimachinery/pkg/runtime/serializer/yaml"
 	yamlutil "k8s.io/apimachinery/pkg/util/yaml"
 
+	"k8s.io/client-go/discovery"
 	"k8s.io/client-go/dynamic"
 	"k8s.io/client-go/rest"
 
@@ -397,7 +398,60 @@ func (c K8sTestHelper) createTestUsers(orgName string) OrgUsers {
 	}
 }
 
-func (c K8sTestHelper) CreateDS(cmd *datasources.AddDataSourceCommand) *datasources.DataSource {
+func (c *K8sTestHelper) NewDiscoveryClient() *discovery.DiscoveryClient {
+	c.t.Helper()
+
+	baseUrl := fmt.Sprintf("http://%s", c.env.Server.HTTPServer.Listener.Addr())
+	conf := &rest.Config{
+		Host:     baseUrl,
+		Username: c.Org1.Admin.Identity.GetLogin(),
+		Password: c.Org1.Admin.password,
+	}
+	client, err := discovery.NewDiscoveryClientForConfig(conf)
+	require.NoError(c.t, err)
+	return client
+}
+
+func (c *K8sTestHelper) GetGroupVersionInfoJSON(group string) string {
+	c.t.Helper()
+
+	disco := c.NewDiscoveryClient()
+	req := disco.RESTClient().Get().
+		Prefix("apis").
+		SetHeader("Accept", "application/json;g=apidiscovery.k8s.io;v=v2beta1;as=APIGroupDiscoveryList,application/json")
+
+	result := req.Do(context.Background())
+	require.NoError(c.t, result.Error())
+
+	type DiscoItem struct {
+		Metadata struct {
+			Name string `json:"name"`
+		} `json:"metadata"`
+		Versions []any `json:"versions,omitempty"`
+	}
+	type DiscoList struct {
+		Items []DiscoItem `json:"items"`
+	}
+
+	raw, err := result.Raw()
+	require.NoError(c.t, err)
+	all := &DiscoList{}
+	err = json.Unmarshal(raw, all)
+	require.NoError(c.t, err)
+
+	for _, item := range all.Items {
+		if item.Metadata.Name == group {
+			v, err := json.MarshalIndent(item.Versions, "", "  ")
+			require.NoError(c.t, err)
+			return string(v)
+		}
+	}
+
+	require.Fail(c.t, "could not find discovery info for: ", group)
+	return ""
+}
+
+func (c *K8sTestHelper) CreateDS(cmd *datasources.AddDataSourceCommand) *datasources.DataSource {
 	c.t.Helper()
 
 	dataSource, err := c.env.Server.HTTPServer.DataSourcesService.AddDataSource(context.Background(), cmd)

pkg/tests/apis/playlist/playlist_test.go

@@ -26,13 +26,43 @@ func TestPlaylist(t *testing.T) {
 	}
 
 	t.Run("default setup", func(t *testing.T) {
-		doPlaylistTests(t, apis.NewK8sTestHelper(t, testinfra.GrafanaOpts{
+		h := doPlaylistTests(t, apis.NewK8sTestHelper(t, testinfra.GrafanaOpts{
 			AppModeProduction: true, // do not start extra port 6443
 			DisableAnonymous:  true,
 			EnableFeatureToggles: []string{
 				featuremgmt.FlagGrafanaAPIServer,
 			},
 		}))
+
+		// The accepted verbs will change when dual write is enabled
+		disco := h.GetGroupVersionInfoJSON("playlist.grafana.app")
+		// fmt.Printf("%s", string(disco))
+		require.JSONEq(t, `[
+			{
+			  "version": "v0alpha1",
+			  "freshness": "Current",
+			  "resources": [
+				{
+				  "resource": "playlists",
+				  "responseKind": {
+					"group": "",
+					"kind": "Playlist",
+					"version": ""
+				  },
+				  "scope": "Namespaced",
+				  "singularResource": "playlist",
+				  "verbs": [
+					"create",
+					"delete",
+					"get",
+					"list",
+					"patch",
+					"update"
+				  ]
+				}
+			  ]
+			}
+		  ]`, disco)
 	})
 
 	t.Run("with k8s api flag", func(t *testing.T) {
@@ -47,17 +77,13 @@ func TestPlaylist(t *testing.T) {
 	})
 }
 
-func doPlaylistTests(t *testing.T, helper *apis.K8sTestHelper) {
+func doPlaylistTests(t *testing.T, helper *apis.K8sTestHelper) *apis.K8sTestHelper {
 	gvr := schema.GroupVersionResource{
 		Group:    "playlist.grafana.app",
 		Version:  "v0alpha1",
 		Resource: "playlists",
 	}
 
-	defer func() {
-		helper.Shutdown()
-	}()
-
 	t.Run("Check direct List permissions from different org users", func(t *testing.T) {
 		// Check view permissions
 		rsp := helper.List(helper.Org1.Viewer, "default", gvr)
@@ -332,6 +358,8 @@ func doPlaylistTests(t *testing.T, helper *apis.K8sTestHelper) {
 		require.NoError(t, err)
 		require.Empty(t, list.Items)
 	})
+
+	return helper
 }
 
 // typescript style map function

public/app/core/utils/colors.ts

@@ -1,5 +1,5 @@
 import config from 'app/core/config';
 
 export function getThemeColor(dark: string, light: string): string {
-  return config.bootData.user.lightTheme ? light : dark;
+  return config.bootData?.user?.lightTheme ? light : dark;
 }