ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	pods := &fakePodCache{}

	pod, f := podAndNetns()
	f.Close()
	pods.pods = map[string]WorkloadInfo{
		string(pod.UID): {}, // simulate unknown netns
	}

	fixture := connectWithPods(ctx, pods)
	ztunClient := fixture.ztunClient
	// read initial pod add
	keep, fds := readRequest(t, ztunClient)
	assert.Equal(t, len(fds), 0)

			WantException:  true,
		},
		{ // case 12
			Args:           strings.Split("envoy --browser=false --selector app=example pod-123456-7890", " "),
			ExpectedRegexp: regexp.MustCompile(".*Error: name cannot be provided when a selector is specified"),
			WantException:  true,
		},
		{ // case 13
			Args:           strings.Split("--browser=false controlz --selector app=example", " "),

message Scheduling {
  // nodeSelector lists labels that must be present on nodes that support this
  // RuntimeClass. Pods using this RuntimeClass can only be scheduled to a
  // node matched by this selector. The RuntimeClass nodeSelector is merged
  // with a pod's existing nodeSelector. Any conflicts will cause the pod to
  // be rejected in admission.
  // +optional
  // +mapType=atomic
  map<string, string> nodeSelector = 1;

func PodRedirectionActive(pod *corev1.Pod) bool {
	return pod.GetAnnotations()[annotation.AmbientRedirection.Name] == constants.AmbientRedirectionEnabled
}

func podHasSidecar(pod *corev1.Pod) bool {
	if _, f := pod.GetAnnotations()[annotation.SidecarStatus.Name]; f {
		return true
	}
	return false
}

func IsZtunnelPod(systemNs string, pod *corev1.Pod) bool {

  // all pods within the namespace.
  // +patchStrategy=replace
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector selector = 2;

  // An eviction is allowed if at most "maxUnavailable" pods selected by
  // "selector" are unavailable after the eviction, i.e. even in absence of
  // the evicted pod. For example, one can prevent all voluntary evictions

    reinvocationPolicy: Never
    rules:
      - apiGroups:
          - ""
        apiVersions:
          - v1
        operations:
          - CREATE
        resources:
          - pods
        scope: '*'
    sideEffects: None
    timeoutSeconds: 10
  - admissionReviewVersions:
      - v1beta1
      - v1
    clientConfig:
      service:
        name: istiod
        namespace: istio-system

message Scheduling {
  // nodeSelector lists labels that must be present on nodes that support this
  // RuntimeClass. Pods using this RuntimeClass can only be scheduled to a
  // node matched by this selector. The RuntimeClass nodeSelector is merged
  // with a pod's existing nodeSelector. Any conflicts will cause the pod to
  // be rejected in admission.
  // +optional
  // +mapType=atomic
  map<string, string> nodeSelector = 1;

            - "false"
    reinvocationPolicy: Never
    rules:
      - apiGroups:
          - ""
        apiVersions:
          - v1
        operations:
          - CREATE
        resources:
          - pods
        scope: '*'
    sideEffects: None
    timeoutSeconds: 10
  - admissionReviewVersions:
      - v1beta1
      - v1
    clientConfig:
      service:
        name: istiod
        namespace: istio-system

  // RuntimeClass. Pods using this RuntimeClass can only be scheduled to a
  // node matched by this selector. The RuntimeClass nodeSelector is merged
  // with a pod's existing nodeSelector. Any conflicts will cause the pod to
  // be rejected in admission.
  // +optional
  // +mapType=atomic
  map<string, string> nodeSelector = 1;

  // tolerations are appended (excluding duplicates) to pods running with this

    CNI["CNI Agent"]
    Z["Ztunnel"]
    Pods["Pods"]
    CNI --Programs--> Z
    CNI --Watches--> Pods
    Z --Runs Within--> Pods
    CNIP --Calls--> CNI
```

The CNI Plugin is a binary installed as a [CNI plugin](https://kubernetes.io/docs/concepts/extend-kubernetes/compute-storage-net/network-plugins/) on the node.
The container runtime is responsible for invoking this when a Pod is being started (before the containers run).