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...