if len(podAffinityTerm.TopologyKey) == 0 {
		allErrs = append(allErrs, field.Required(fldPath.Child("topologyKey"), "can not be empty"))
	}
	return append(allErrs, unversionedvalidation.ValidateLabelName(podAffinityTerm.TopologyKey, fldPath.Child("topologyKey"))...)
}

// validatePodAffinityTerms tests that the specified podAffinityTerms fields have valid data

	// whose value of the label with key topologyKey matches that of any node on which any of the
	// selected pods is running.
	// Empty topologyKey is not allowed.
	TopologyKey string `json:"topologyKey" protobuf:"bytes,3,opt,name=topologyKey"`
	// A label query over the set of namespaces that the term applies to.

  // the labelSelector in the specified namespaces, where co-located is defined as running on a node
  // whose value of the label with key topologyKey matches that of any node on which any of the
  // selected pods is running.
  // Empty topologyKey is not allowed.
  optional string topologyKey = 3;

  // A label query over the set of namespaces that the term applies to.

  // the labelSelector in the specified namespaces, where co-located is defined as running on a node
  // whose value of the label with key topologyKey matches that of any node on which any of the
  // selected pods is running.
  // Empty topologyKey is not allowed.
  optional string topologyKey = 3;

  // A label query over the set of namespaces that the term applies to.

	// the labelSelector in the specified namespaces, where co-located is defined as running on a node
	// whose value of the label with key topologyKey matches that of any node on which any of the
	// selected pods is running.
	// Empty topologyKey is not allowed.
	TopologyKey string
	// A label query over the set of namespaces that the term applies to.
	// The term is applied to the union of the namespaces selected by this field

	"topologyKey":       "This pod should be co-located (affinity) or not co-located (anti-affinity) with the pods matching the labelSelector in the specified namespaces, where co-located is defined as running on a node whose value of the label with key topologyKey matches that of any node on which any of the selected pods is running. Empty topologyKey is not allowed.",

            "x-kubernetes-list-type": "atomic"
          },
          "topologyKey": {
            "default": "",

	out.LabelSelector = (*metav1.LabelSelector)(unsafe.Pointer(in.LabelSelector))
	out.Namespaces = *(*[]string)(unsafe.Pointer(&in.Namespaces))
	out.TopologyKey = in.TopologyKey
	out.NamespaceSelector = (*metav1.LabelSelector)(unsafe.Pointer(in.NamespaceSelector))
	out.MatchLabelKeys = *(*[]string)(unsafe.Pointer(&in.MatchLabelKeys))

- Kube-scheduler now retries scheduling Pods rejected by the PodTopologySpread plugin when related Pods are created, deleted, updated, or when a node matches the specified topologyKey. ([#122195](https://github.com/kubernetes/kubernetes/pull/122195), [@nayihz](https://github.com/nayihz))
- Kubeadm now prints all the kubelets and nodes that need to be upgraded when running "upgrade plan".

  don't match the node affinity/selector. This may lead to unschedulable pods if you previously had pods
  matching the spreading selector on those excluded nodes (not matching the node affinity/selector),
  especially when the `topologyKey` is not node-level. Revisit the node affinity and/or pod selector in the
  topology spread constraints to avoid this scenario. ([#107009](https://github.com/kubernetes/kubernetes/pull/107009), [@kerthcet](https://github.com/kerthcet))