// +optional
  optional string path = 1;

  // PathType determines the interpretation of the Path matching. PathType can
  // be one of the following values:
  // * Exact: Matches the URL path exactly.
  // * Prefix: Matches based on a URL path prefix split by '/'. Matching is
  //   done on a path element by element basis. A path element refers is the

  // an API request to apps/v1beta1 deployments would be converted and sent to the webhook
  // with `kind: {group:"apps", version:"v1", kind:"Deployment"}` (matching the rule the webhook registered for),
  // and `requestKind: {group:"apps", version:"v1beta1", kind:"Deployment"}` (indicating the kind of the original API request).
  //

  // More info: https://kubernetes.io/docs/concepts/workloads/controllers/replicationcontroller/#what-is-a-replicationcontroller
  optional int32 replicas = 1;

  // The number of pods that have labels matching the labels of the pod template of the replicaset.
  // +optional
  optional int32 fullyLabeledReplicas = 2;

  // readyReplicas is the number of pods targeted by this ReplicaSet with a Ready Condition.
  // +optional

  // e.g. "must be a URL with the host matching spec.host"
  // If the Expression contains line breaks. Message is required.
  // The message must not contain line breaks.
  // If unset, the message is "failed Expression: {Expression}".
  // +optional
  optional string message = 2;

  // Reason represents a machine-readable description of why this validation failed.

  // `resourceRules` is a slice of ResourcePolicyRules that identify matching requests according to their verb and the
  // target resource.
  // At least one of `resourceRules` and `nonResourceRules` has to be non-empty.
  // +listType=atomic
  // +optional
  repeated ResourcePolicyRule resourceRules = 2;

  // `nonResourceRules` is a list of NonResourcePolicyRules that identify matching requests according to their verb

  // `resourceRules` is a slice of ResourcePolicyRules that identify matching requests according to their verb and the
  // target resource.
  // At least one of `resourceRules` and `nonResourceRules` has to be non-empty.
  // +listType=atomic
  // +optional
  repeated ResourcePolicyRule resourceRules = 2;

  // `nonResourceRules` is a list of NonResourcePolicyRules that identify matching requests according to their verb

pilot:
  env:
    # 1.21 behavioral changes
    ENABLE_EXTERNAL_NAME_ALIAS: "false"
    PERSIST_OLDEST_FIRST_HEURISTIC_FOR_VIRTUAL_SERVICE_HOST_MATCHING: "true"
    VERIFY_CERTIFICATE_AT_CLIENT: "false"
    ENABLE_AUTO_SNI: "false"

    # 1.22 behavioral changes
    ENABLE_RESOLUTION_NONE_TARGET_PORT: "false"

meshConfig:
  # 1.22 behavioral changes
  defaultConfig:
    proxyMetadata:
      ISTIO_DELTA_XDS: "false"
    tracing:

pilot:
  env:
    # 1.21 behavioral changes
    ENABLE_EXTERNAL_NAME_ALIAS: "false"
    PERSIST_OLDEST_FIRST_HEURISTIC_FOR_VIRTUAL_SERVICE_HOST_MATCHING: "true"
    VERIFY_CERTIFICATE_AT_CLIENT: "false"
    ENABLE_AUTO_SNI: "false"

    # 1.22 behavioral changes
    ENABLE_RESOLUTION_NONE_TARGET_PORT: "false"

meshConfig:
  # 1.22 behavioral changes

pilot:
  env:
    # 1.21 behavioral changes
    ENABLE_EXTERNAL_NAME_ALIAS: "false"
    PERSIST_OLDEST_FIRST_HEURISTIC_FOR_VIRTUAL_SERVICE_HOST_MATCHING: "true"
    VERIFY_CERTIFICATE_AT_CLIENT: "false"
    ENABLE_AUTO_SNI: "false"

    # 1.22 behavioral changes
    ENABLE_RESOLUTION_NONE_TARGET_PORT: "false"

meshConfig:
  # 1.22 behavioral changes

}

// MetricSpec specifies how to scale based on a single metric
// (only `type` and one other matching field should be set at once).
message MetricSpec {
  // type is the type of metric source.  It should be one of "ContainerResource", "External",
  // "Object", "Pods" or "Resource", each mapping to a matching field in the object.
  // Note: "ContainerResource" type is available on when the feature-gate