//
  // IfHealthyBudget policy means that running pods (status.phase="Running"),
  // but not yet healthy can be evicted only if the guarded application is not
  // disrupted (status.currentHealthy is at least equal to status.desiredHealthy).
  // Healthy pods will be subject to the PDB for eviction.
  //
  // AlwaysAllow policy means that all running pods (status.phase="Running"),

  imagePullSecrets: []

  # This value is used to configure a Kubernetes PodDisruptionBudget for the gateway.
  #
  # By default, the `podDisruptionBudget` is disabled (set to `{}`),
  # which means that no PodDisruptionBudget resource will be created.
  #
  # To enable the PodDisruptionBudget, configure it by specifying the
  # `minAvailable` or `maxUnavailable`. For example, to set the

    # Used to locate istiod.
    istioNamespace: istio-system

    externalIstiod: false
    remotePilotAddress: ""

    # Platform where Istio is deployed. Possible values are: "openshift", "gcp".
    # An empty value means it is a vanilla Kubernetes distribution, therefore no special
    # treatment will be considered.
    platform: ""

  // +optional
  repeated string resources = 3;

  // ResourceNames is an optional white list of names that the rule applies to.  An empty set means that everything is allowed.
  // +optional
  repeated string resourceNames = 4;

  // NonResourceURLs is a set of partial urls that a user should have access to.  *s are allowed, but only as the full, final step in the path

//
// When a Quantity is parsed from a string, it will remember the type of suffix
// it had, and will use the same type again when it is serialized.
//
// Before serializing, Quantity will be put in "canonical form".
// This means that Exponent/suffix will be adjusted up or down (with a
// corresponding increase or decrease in Mantissa) such that:
//
// - No precision is lost
// - No fractional digits will be emitted

  optional bytes raw = 2;

  // ContentEncoding is encoding used to encode 'Raw' data.
  // Unspecified means no encoding.
  optional string contentEncoding = 3;

  // ContentType  is serialization method used to serialize 'Raw'.
  // Unspecified means ContentTypeJSON.
  optional string contentType = 4;

  // +optional
  repeated string resources = 4;

  // ResourceNames is an optional white list of names that the rule applies to.  An empty set means that everything is allowed.
  // +optional
  repeated string resourceNames = 5;

  // NonResourceURLs is a set of partial urls that a user should have access to.  *s are allowed, but only as the full, final step in the path

  // +optional
  repeated string resources = 3;

  // ResourceNames is an optional white list of names that the rule applies to.  An empty set means that everything is allowed.
  // +optional
  repeated string resourceNames = 4;

  // NonResourceURLs is a set of partial urls that a user should have access to.  *s are allowed, but only as the full, final step in the path

error rate, and request latency at p50, p90, and p99 percentiles. The
query results are printed to the console, organized by workload name.

All metrics returned are from server-side reports. This means that latencies
and error rates are from the perspective of the service itself and not of an
individual client (or aggregate set of clients). Rates and latencies are
calculated over a time interval of 1 minute.
`,

If the change is to a Kubernetes field (such as modifying a Deployment attribute), it will likely need to be install-time configuration.
However, that doesn't necessarily mean a PR to add a value will be accepted.
The `values.yaml` API is intended to maintain a *minimal core set of configuration* that most users will use.