DualWrite: Cleanup and centralize the dual write creation (#90013)

pkg/registry/apis/datasource/register.go

@@ -156,11 +156,6 @@ func (b *DataSourceAPIBuilder) GetGroupVersion() schema.GroupVersion {
 	return b.connectionResourceInfo.GroupVersion()
 }
 
-func (b *DataSourceAPIBuilder) GetDesiredDualWriterMode(dualWrite bool, modeMap map[string]grafanarest.DualWriterMode) grafanarest.DualWriterMode {
-	// Add required configuration support in order to enable other modes. For an example, see pkg/registry/apis/playlist/register.go
-	return grafanarest.Mode0
-}
-
 func addKnownTypes(scheme *runtime.Scheme, gv schema.GroupVersion) {
 	scheme.AddKnownTypes(gv,
 		&datasource.DataSourceConnection{},
@@ -208,8 +203,7 @@ func (b *DataSourceAPIBuilder) GetAPIGroupInfo(
 	scheme *runtime.Scheme,
 	codecs serializer.CodecFactory, // pointer?
 	_ generic.RESTOptionsGetter,
-	_ grafanarest.DualWriterMode,
-	_ prometheus.Registerer,
+	_ grafanarest.DualWriteBuilder,
 ) (*genericapiserver.APIGroupInfo, error) {
 	storage := map[string]rest.Storage{}