This allows configuration without re-installing or restarting deployments.

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.

                      description: Optional.
                      items:
                        properties:
                          key:
                            description: The name of an Istio attribute.
                            type: string
                          notValues:
                            description: Optional.
                            items:
                              type: string

  // Webhooks with side effects MUST implement a reconciliation system, since a request may be
  // rejected by a future step in the admission chain and the side effects therefore need to be undone.
  // Requests with the dryRun attribute will be auto-rejected if they match a webhook with
  // sideEffects == Unknown or Some.
  optional string sideEffects = 6;

  // TimeoutSeconds specifies the timeout for this webhook. After the timeout passes,

  // Webhooks with side effects MUST implement a reconciliation system, since a request may be
  // rejected by a future step in the admission chain and the side effects therefore need to be undone.
  // Requests with the dryRun attribute will be auto-rejected if they match a webhook with
  // sideEffects == Unknown or Some. Defaults to Unknown.
  // +optional
  optional string sideEffects = 6;

belongs in the [MeshConfig API](https://github.com/istio/api/blob/master/mesh/v1alpha1/config.proto). This allows configuration without re-installing or restarting deployments. 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. For...

                      description: Optional.
                      items:
                        properties:
                          key:
                            description: The name of an Istio attribute.
                            type: string
                          notValues:
                            description: Optional.
                            items:
                              type: string

                  selected by name.
                items:
                  type: string
                type: array
              localPref:
                description: The BGP LOCAL_PREF attribute which is used by BGP best
                  path algorithm, Path with higher localpref is preferred over one
                  with lower localpref.
                format: int32
                type: integer

// and should assume that any attribute may be empty, invalid, or under
// defined.
message StatusDetails {
  // The name attribute of the resource associated with the status StatusReason
  // (when there is a single name which can be described).
  // +optional
  optional string name = 1;

  // The group attribute of the resource associated with the status StatusReason.