feat(mgr) load klog flags into Cobra flags

railgun/manager/config.go

@@ -1,13 +1,15 @@
 package manager
 
 import (
+	goflag "flag"
 	"fmt"
 
 	"github.com/kong/kubernetes-ingress-controller/pkg/adminapi"
 	"github.com/kong/kubernetes-ingress-controller/pkg/annotations"
 	"github.com/kong/kubernetes-ingress-controller/pkg/util"
 	"github.com/spf13/pflag"
 	corev1 "k8s.io/api/core/v1"
+	"k8s.io/klog"
 )
 
 // -----------------------------------------------------------------------------
@@ -80,6 +82,11 @@ func (c *Config) FlagSet() *pflag.FlagSet {
 
 	flagSet := flagSet{*pflag.NewFlagSet("", pflag.ExitOnError)}
 
+	// Add Go flags for klog
+	klog.InitFlags(nil)
+	goflag.Parse()
+	flagSet.AddGoFlagSet(goflag.CommandLine)
+
 	// Logging configurations
 	flagSet.StringVar(&c.LogLevel, "log-level", "info", `Level of logging for the controller. Allowed values are trace, debug, info, warn, error, fatal and panic.`)
 	flagSet.StringVar(&c.LogFormat, "log-format", "text", `Format of logs of the controller. Allowed values are text and json.`)