`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.

  optional string user = 3;

  // Groups is the groups you're testing for.
  // +optional
  repeated string group = 4;

  // Extra corresponds to the user.Info.GetExtra() method from the authenticator.  Since that is input to the authorizer
  // it needs a reflection here.
  // +optional
  map<string, ExtraValue> extra = 5;

  // UID information about the requesting user.
  // +optional
  optional string uid = 6;
}

    cni:
      enabled: true
```

The operator validates the configuration and automatically detects syntax errors. If you are
using Helm values that are incompatible, the schema validation used in the operator may reject input that is valid for
Helm.
Each Istio component has K8s settings, and these can be overridden from the defaults using official K8s APIs rather than
Istio defined schemas ([samples/pilot-k8s.yaml](samples/pilot-k8s.yaml)):

* Ensure traffic between mesh workloads is securely encrypted with an Istio identity.
* Be lightweight enough to not limit adoption.
  * This puts a much tighter budget on CPU, memory, latency, and throughput requirements than traditional Istio sidecars.

Ztunnel was not designed to be a feature-rich data plane.

# Controllers

Istio has a variety of [controllers](https://kubernetes.io/docs/concepts/architecture/controller/), which basically watch some inputs and do something.
This can be reading from Kubernetes and writing other objects back, writing to proxies over XDS, etc.

Unfortunately, writing controllers is very error prone, even for seemingly simple cases.
To work around this, Istio has a variety of abstractions meant to make writing controllers easier.

## Clients

  // Groups is the groups you're testing for.
  // +optional
  repeated string groups = 4;

  // Extra corresponds to the user.Info.GetExtra() method from the authenticator.  Since that is input to the authorizer
  // it needs a reflection here.
  // +optional
  map<string, ExtraValue> extra = 5;

  // UID information about the requesting user.
  // +optional
  optional string uid = 6;
}

// Package-wide variables from generator "generated".
option go_package = "k8s.io/apimachinery/pkg/apis/testapigroup/v1";

// Carp is a collection of containers, used as either input (create, update) or as output (list, get).
message Carp {
  // Standard object's metadata.
  // More info: https://git.k8s.io/community/contributors/devel/sig-architecture/api-conventions.md#metadata
  // +optional

  // The container image's ENTRYPOINT is used if this is not provided.
  // Variable references $(VAR_NAME) are expanded using the container's environment. If a variable
  // cannot be resolved, the reference in the input string will be unchanged. Double $$ are reduced
  // to a single $, which allows for escaping the $(VAR_NAME) syntax: i.e. "$$(VAR_NAME)" will