Use client generator to generate all k8s clients and add respective client-go metrics (#2668)

* Define client generator to generate all k8s clients
* Increase QPS and burst values
* Capture client-go metrics
* Support for controller runtime metrics

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

cmd/fission-bundle/mqtrigger/mqtrigger.go

@@ -35,10 +35,10 @@ import (
 )
 
 func Start(ctx context.Context, logger *zap.Logger, routerUrl string) error {
-	fissionClient, _, _, _, err := crd.MakeFissionClient()
-
+	clientGen := crd.NewClientGenerator()
+	fissionClient, err := clientGen.GetFissionClient()
 	if err != nil {
-		return errors.Wrap(err, "failed to get fission or kubernetes client")
+		return errors.Wrap(err, "failed to get fission client")
 	}
 
 	err = crd.WaitForCRDs(ctx, logger, fissionClient)

cmd/preupgradechecks/checks.go

@@ -52,9 +52,18 @@ const (
 )
 
 func makePreUpgradeTaskClient(logger *zap.Logger) (*PreUpgradeTaskClient, error) {
-	fissionClient, k8sClient, apiExtClient, _, err := crd.MakeFissionClient()
+	clientGen := crd.NewClientGenerator()
+	fissionClient, err := clientGen.GetFissionClient()
 	if err != nil {
-		return nil, errors.Wrap(err, "error making fission client")
+		return nil, errors.Wrap(err, "failed to get fission client")
+	}
+	k8sClient, err := clientGen.GetKubernetesClient()
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to get kubernetes client")
+	}
+	apiExtClient, err := clientGen.GetApiExtensionsClient()
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to get apiextensions client")
 	}
 
 	return &PreUpgradeTaskClient{