add --trace flag

cmd/minikube/cmd/start.go

@@ -60,7 +60,7 @@ import (
 	"k8s.io/minikube/pkg/minikube/out/register"
 	"k8s.io/minikube/pkg/minikube/reason"
 	"k8s.io/minikube/pkg/minikube/style"
-	"k8s.io/minikube/pkg/trace"
+	pkgtrace "k8s.io/minikube/pkg/trace"
 
 	"k8s.io/minikube/pkg/minikube/registry"
 	"k8s.io/minikube/pkg/minikube/translate"
@@ -130,7 +130,10 @@ func runStart(cmd *cobra.Command, args []string) {
 	register.SetEventLogPath(localpath.EventLog(ClusterFlagValue()))
 
 	out.SetJSON(outputFormat == "json")
-	trace.Initialize("gcp")
+	if err := pkgtrace.Initialize(viper.GetString(trace)); err != nil {
+		exit.Message(reason.Usage, "error initializing tracing: {{.Error}}", out.V{"Error": err.Error()})
+	}
+	defer pkgtrace.Cleanup()
 	displayVersion(version.GetVersion())
 
 	// No need to do the update check if no one is going to see it

cmd/minikube/cmd/start_flags.go

@@ -108,6 +108,7 @@ const (
 	kicBaseImage            = "base-image"
 	ports                   = "ports"
 	startNamespace          = "namespace"
+	trace                   = "trace"
 )
 
 var (
@@ -152,6 +153,7 @@ func initMinikubeFlags() {
 	startCmd.Flags().Bool(deleteOnFailure, false, "If set, delete the current cluster if start fails and try again. Defaults to false.")
 	startCmd.Flags().Bool(forceSystemd, false, "If set, force the container runtime to use sytemd as cgroup manager. Currently available for docker and crio. Defaults to false.")
 	startCmd.Flags().StringVarP(&outputFormat, "output", "o", "text", "Format to print stdout in. Options include: [text,json]")
+	startCmd.Flags().StringP(trace, "", "", "Send trace events. Options include: [gcp]")
 }
 
 // initKubernetesFlags inits the commandline flags for Kubernetes related options

pkg/minikube/out/register/register.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 
 	"k8s.io/klog/v2"
+	"k8s.io/minikube/pkg/trace"
 )
 
 const (
@@ -117,6 +118,7 @@ func (r *Register) currentStep() string {
 
 // SetStep sets the current step
 func (r *Register) SetStep(s RegStep) {
+	defer trace.StartSpan(string(s))
 	if r.first == RegStep("") {
 		_, ok := r.steps[s]
 		if ok {
@@ -124,6 +126,8 @@ func (r *Register) SetStep(s RegStep) {
 		} else {
 			klog.Errorf("unexpected first step: %q", r.first)
 		}
+	} else {
+		trace.EndSpan(string(r.current))
 	}
 
 	r.current = s