message ResourceClaimSpec {
  // ResourceClassName references the driver and additional parameters
  // via the name of a ResourceClass that was created as part of the
  // driver deployment.
  optional string resourceClassName = 1;

  // ParametersRef references a separate object with arbitrary parameters
  // that will be used by the driver when allocating a resource for the
  // claim.
  //

  optional k8s.io.apimachinery.pkg.api.resource.Quantity targetValue = 3;

  // selector is the string-encoded form of a standard kubernetes label selector for the given metric
  // When set, it is passed as an additional parameter to the metrics server for more specific metrics scoping
  // When unset, just the metricName will be used to gather metrics.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector selector = 4;

// +k8s:deepcopy-gen=true
// +k8s:openapi-gen=true
message Quantity {
  optional string string = 1;
}

// QuantityValue makes it possible to use a Quantity as value for a command
// line parameter.
//
// +protobuf=true
// +protobuf.embed=string
// +protobuf.options.marshal=false
// +protobuf.options.(gogoproto.goproto_stringer)=false
// +k8s:deepcopy-gen=true
message QuantityValue {

compatibility.

Some parameters will temporarily exist both the component configuration and legacy Helm APIs - for example, K8s
resources. However, the Istio community recommends using the first API as it is more consistent, is validated,
and will naturally follow the graduation process for APIs while the same parameters in the configuration API are planned
for deprecation.

// controller will use to perform updates. It includes any additional parameters
// necessary to perform the update for the indicated strategy.
message StatefulSetUpdateStrategy {
  // Type indicates the type of the StatefulSetUpdateStrategy.
  // Default is RollingUpdate.
  // +optional
  optional string type = 1;

  // RollingUpdate is used to communicate parameters when Type is RollingUpdateStatefulSetStrategyType.
  // +optional

  // provisioner indicates the type of the provisioner.
  optional string provisioner = 2;

  // parameters holds the parameters for the provisioner that should
  // create volumes of this storage class.
  // +optional
  map<string, string> parameters = 3;

  // reclaimPolicy controls the reclaimPolicy for dynamically provisioned PersistentVolumes of this storage class.
  // Defaults to Delete.

  // provisioner indicates the type of the provisioner.
  optional string provisioner = 2;

  // parameters holds the parameters for the provisioner that should
  // create volumes of this storage class.
  // +optional
  map<string, string> parameters = 3;

  // reclaimPolicy controls the reclaimPolicy for dynamically provisioned PersistentVolumes of this storage class.
  // Defaults to Delete.

  // name is the name of the given metric
  optional string name = 1;

  // selector is the string-encoded form of a standard kubernetes label selector for the given metric
  // When set, it is passed as an additional parameter to the metrics server for more specific metrics scoping.
  // When unset, just the metricName will be used to gather metrics.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector selector = 2;
}

`Generators` get as input the `Proxy` (a representation of the current client), the current `PushContext` snapshot, and a list of config updates that caused the change.

  // same controller. For example, you may have different parameters for the
  // same implementing controller. This should be specified as a
  // domain-prefixed path no more than 250 characters in length, e.g.
  // "acme.io/ingress-controller". This field is immutable.
  optional string controller = 1;

  // parameters is a link to a custom resource containing additional