K8s: Add not found handler (grafana#100893)

pkg/services/apiserver/service.go

@@ -11,8 +11,10 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/runtime/serializer"
+	genericapifilters "k8s.io/apiserver/pkg/endpoints/filters"
 	"k8s.io/apiserver/pkg/endpoints/responsewriter"
 	genericapiserver "k8s.io/apiserver/pkg/server"
+	"k8s.io/apiserver/pkg/util/notfoundhandler"
 	clientrest "k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/clientcmd"
 	aggregatorapiserver "k8s.io/kube-aggregator/pkg/apiserver"
@@ -363,8 +365,10 @@ func (s *service) start(ctx context.Context) error {
 		return err
 	}
 
+	notFoundHandler := notfoundhandler.New(Codecs, genericapifilters.NoMuxAndDiscoveryIncompleteKey)
+
 	// Create the server
-	server, err := serverConfig.Complete().New("grafana-apiserver", genericapiserver.NewEmptyDelegate())
+	server, err := serverConfig.Complete().New("grafana-apiserver", genericapiserver.NewEmptyDelegateWithCustomHandler(notFoundHandler))
 	if err != nil {
 		return err
 	}