In ambient mode, the CNI plugin is effectively just a shim to catch pod creation events and notify the CNI agent early enough to set up network redirection before the pod is fully started. This is necessary because the CNI plugin is effectively the first thing to see a scheduled pod - before the K8S control plane will see things like the pod IP or networking info, the CNI will - but the CNI plugin alone is not sufficient to...

  optional string expression = 2;
}

// MutatingWebhook describes an admission webhook and the resources and operations it applies to.
message MutatingWebhook {
  // The name of the admission webhook.
  // Name should be fully qualified, e.g., imagepolicy.kubernetes.io, where
  // "imagepolicy" is the name of the webhook, and kubernetes.io is the name
  // of the organization.
  // Required.
  optional string name = 1;

  * In practice, this largely means that references are fully qualified in the API. IP Addresses (generally) have a network associated with them, node names have a cluster associated with them, etc.

  optional string expression = 2;
}

// MutatingWebhook describes an admission webhook and the resources and operations it applies to.
message MutatingWebhook {
  // The name of the admission webhook.
  // Name should be fully qualified, e.g., imagepolicy.kubernetes.io, where
  // "imagepolicy" is the name of the webhook, and kubernetes.io is the name
  // of the organization.
  // Required.
  optional string name = 1;

// the related backend services. Incoming requests are first evaluated for a host
// match, then routed to the backend associated with the matching IngressRuleValue.
message IngressRule {
  // host is the fully qualified domain name of a network host, as defined by RFC 3986.
  // Note the following deviations from the "host" part of the
  // URI as defined in RFC 3986:

// the related backend services. Incoming requests are first evaluated for a host
// match, then routed to the backend associated with the matching IngressRuleValue.
message IngressRule {
  // host is the fully qualified domain name of a network host, as defined by RFC 3986.
  // Note the following deviations from the "host" part of the
  // URI as defined in RFC 3986:

// the related backend services. Incoming requests are first evaluated for a host
// match, then routed to the backend associated with the matching IngressRuleValue.
message IngressRule {
  // Host is the fully qualified domain name of a network host, as defined by RFC 3986.
  // Note the following deviations from the "host" part of the
  // URI as defined in RFC 3986: