return nil, nil, err
		}
	}
	return injector, meshConfig, err
}

// getIOPConfigs gets the configs in IOPs.
func getIOPConfigs() (string, *meshconfig.MeshConfig, error) {
	var meshConfig *meshconfig.MeshConfig
	var valuesConfig string
	if iopFilename != "" {
		iop, err := render.MergeInputs([]string{iopFilename}, nil, nil)
		if err != nil {

	meshConfig := &meshconfig.MeshConfig{
		DefaultConfig: &meshconfig.ProxyConfig{
			ProxyMetadata: map[string]string{},
		},
	}
	if err := protomarshal.ApplyYAML(istio.Data[istioctlutil.ConfigMapKey], meshConfig); err != nil {
		return nil, err
	}
	if isRevisioned(revision) && meshConfig.DefaultConfig.DiscoveryAddress == "" {

	// The actual name can be different - use getMeshConfigMapName
	DefaultMeshConfigMapName = "istio"

	// ConfigMapKey should match the expected MeshConfig file name
	ConfigMapKey = "mesh"

	// ValuesConfigMapKey should match the expected Values file name
	ValuesConfigMapKey = "values"

	DefaultRevisionName = "default"
)

const (

	err := checkTracing(cli, &messages)
	assert.NoError(t, err)
	assert.Equal(t, 1, len(messages))

	expectedOutput := msg.NewUpdateIncompatibility(ObjectToInstance(zipkinSvc),
		"meshConfig.defaultConfig.tracer", "1.21",
		"tracing is no longer by default enabled to send to 'zipkin.istio-system.svc'; "+
			"follow https://istio.io/latest/docs/tasks/observability/distributed-tracing/telemetry-api/",
		"1.21")

}

const goldenSuffix = ".golden"

// TestWorkloadEntryConfigure enumerates test cases based on subdirectories of testdata/vmconfig.
// Each subdirectory contains two input files: workloadgroup.yaml and meshconfig.yaml that are used
// to generate golden outputs from the VM command.
func TestWorkloadEntryConfigure(t *testing.T) {
	noClusterID := "failed to automatically determine the --clusterID"

Mesh Config controller is a pretty simple controller, reading from `ConfigMap`(s) (multiple if `SHARED_MESH_CONFIG` is used), processing and merging these into a the typed `MeshConfig`. It then exposes this over a simple `mesh.Watcher`, which just exposes a way to access the current `MeshConfig` and get notified when it changes.

#### Ingress

  held off after the release. Hiding/Showing documentation does not require TOC approval.
* Cases for other API changes require TOC approval
    * Simple `meshConfig` changes have been approved in the past. Functionality should not be enabled by default.
* For large API changes, 2 members of the TOC must approve the PR before release manager approval in the release branch

- Helm is for configuration that is expected to be set at install-time only. If the change is a dynamic runtime configuration, it probably belongs in the [MeshConfig API](https://github.com/istio/api/blob/master/mesh/v1alpha1/config.proto). This allows configuration without re-installing or restarting deployments.

		return err
	}
	if err != nil {
		// not found
		return nil
	}
	// found
	res := ObjectToInstance(svc)
	messages.Add(msg.NewUpdateIncompatibility(res,
		"meshConfig.defaultConfig.tracer", "1.21",
		"tracing is no longer by default enabled to send to 'zipkin.istio-system.svc'; "+
			"follow https://istio.io/latest/docs/tasks/observability/distributed-tracing/telemetry-api/",
		"1.21"))

		for port, mode := range pa.PerPort {
			fmt.Fprintf(writer, "      %d: %s\n", port, mode.String())
		}
	}
}

func getMeshConfig(kubeClient kube.CLIClient, istioNamespace string) (*meshconfig.MeshConfig, error) {
	rev := kubeClient.Revision()
	meshConfigMapName := istioctlutil.DefaultMeshConfigMapName

	// if the revision is not "default", render mesh config map name with revision