// Specifies the hostname of the Carp
  // If not specified, the carp's hostname will be set to a system-defined value.
  // +optional
  optional string hostname = 16;

  // If specified, the fully qualified Carp hostname will be "<hostname>.<subdomain>.<carp namespace>.svc.<cluster domain>".
  // If not specified, the carp will not have a domainname at all.
  // +optional
  optional string subdomain = 17;

  // The value will change as readiness probes keep executing. If no readiness
  // probes are specified, this field defaults to true once the container is
  // fully started (see Started field).
  //
  // The value is typically used to determine whether a container is ready to
  // accept traffic.
  optional bool ready = 4;

  optional string uid = 1;

  // Kind is the fully-qualified type of object being submitted (for example, v1.Pod or autoscaling.v1.Scale)
  optional k8s.io.apimachinery.pkg.apis.meta.v1.GroupVersionKind kind = 2;

  // Resource is the fully-qualified resource being requested (for example, v1.pods)
  optional k8s.io.apimachinery.pkg.apis.meta.v1.GroupVersionResource resource = 3;

This is consumed in two ways:
* Some components just block on `watcher.WaitForCRD(...)` before doing the work they need.
* `kclient.NewDelayedInformer` can also fully abstract this away, by providing a client that handles this behind the scenes.

#### Credentials Controller

// the related backend services. Incoming requests are first evaluated for a host
// match, then routed to the backend associated with the matching IngressRuleValue.
message IngressRule {
  // Host is the fully qualified domain name of a network host, as defined by RFC 3986.
  // Note the following deviations from the "host" part of the
  // URI as defined in RFC 3986:

  // remove the pod from the API. In the presence of network partitions, this object may still
  // exist after this timestamp, until an administrator or automated process can determine the
  // resource is fully terminated.
  // If not set, graceful deletion of the object has not been requested.
  //
  // Populated by the system when a graceful deletion is requested.
  // Read-only.

  When a filter changes and includes/removes new objects, those are automatically handled.
* Proper syncing and shutdown logic. Checking for when an informer has fully started can be quite tricky; `kclient` automatically handles it.

Under the `kclient` package, `clienttest` also provides similar interfaces meant for writing unit tests.