update docs

pkg/trace/trace.go

@@ -49,7 +49,7 @@ func getTracer(t string) (minikubeTracer, error) {
 	case "":
 		return nil, nil
 	}
-	return nil, fmt.Errorf("%s is not a valid tracer", t)
+	return nil, fmt.Errorf("%s is not a valid tracer, valid tracers include: [gcp]", t)
 }
 
 // StartSpan starts a span with the given name

site/content/en/docs/commands/start.md

@@ -87,6 +87,7 @@ minikube start [flags]
       --preload                           If set, download tarball of preloaded images if available to improve start time. Defaults to true. (default true)
       --registry-mirror strings           Registry mirrors to pass to the Docker daemon
       --service-cluster-ip-range string   The CIDR to be used for service cluster IPs. (default "10.96.0.0/12")
+      --trace string                      Send trace events. Options include: [gcp]
       --uuid string                       Provide VM UUID to restore MAC address (hyperkit driver only)
       --vm                                Filter to use only VM Drivers
       --vm-driver driver                  DEPRECATED, use driver instead.