```mermaid
graph LR
    subgraph Client Node
        Client
        CZ["Ztunnel"]
    end
    subgraph Server Node
        Server
        SZ["Ztunnel"]
    end
    Client--Plain-->CZ
    CZ-."HBONE (target)".->Server
    CZ--"HBONE (actual)"-->SZ
    SZ--Plain-->Server
```

### Pooling

User connections can be multiplexed over shared HBONE connections.

### Controller (running locally)

1. Set env $WATCH_NAMESPACE (default value is "istio-system") and $LEADER_ELECTION_NAMESPACE (default value is "istio-operator")

1. Create the `WATCH_NAMESPACE` and `LEADER_ELECTION_NAMESPACE` if they are not created yet.

```bash
kubectl create ns $WATCH_NAMESPACE --dry-run -o yaml | kubectl apply -f -
kubectl create ns $LEADER_ELECTION_NAMESPACE --dry-run -o yaml | kubectl apply -f -
```

  // versions the Webhook expects. API server will try to use first version in
  // the list which it supports. If none of the versions specified in this list
  // supported by API server, validation will fail for this object.
  // If a persisted webhook configuration specifies allowed versions and does not
  // include any versions known to the API Server, calls to the webhook will fail
  // and be subject to the failure policy.

  // Requests will be matched against the Host field in the following way:
  // 1. If host is precise, the request matches this rule if the http host header is equal to Host.
  // 2. If host is a wildcard, then the request matches this rule if the http host header
  // is to equal to the suffix (removing the first label) of the wildcard rule.
  // +optional
  optional string host = 1;

  // that requests of this priority level are not subject to a limit
  // (and thus are never queued) and do not detract from the
  // capacity made available to other priority levels.  A value of
  // `"Limited"` means that (a) requests of this priority level
  // _are_ subject to limits and (b) some of the server's limited
  // capacity is made available exclusively to this priority level.
  // Required.

  // that requests of this priority level are not subject to a limit
  // (and thus are never queued) and do not detract from the
  // capacity made available to other priority levels.  A value of
  // `"Limited"` means that (a) requests of this priority level
  // _are_ subject to limits and (b) some of the server's limited
  // capacity is made available exclusively to this priority level.
  // Required.

  // If not specified, this will default to the time zone of the kube-controller-manager process.
  // The set of valid time zone names and the time zone offset is loaded from the system-wide time zone
  // database by the API server during CronJob validation and the controller manager during execution.
  // If no system-wide time zone database can be found a bundled version of the database is used instead.

  // Requests will be matched against the Host field in the following way:
  // 1. If Host is precise, the request matches this rule if the http host header is equal to Host.
  // 2. If Host is a wildcard, then the request matches this rule if the http host header
  // is to equal to the suffix (removing the first label) of the wildcard rule.
  // +optional
  optional string host = 1;

	cp manifests/charts/base/templates/reader-serviceaccount.yaml manifests/charts/istiod-remote/templates
	cp manifests/charts/istio-control/istio-discovery/templates/mutatingwebhook.yaml manifests/charts/istiod-remote/templates
	cp manifests/charts/istio-control/istio-discovery/templates/reader-clusterrole.yaml manifests/charts/istiod-remote/templates

  // selector is the string-encoded form of a standard kubernetes label selector for the given metric
  // When set, it is passed as an additional parameter to the metrics server for more specific metrics scoping
  // When unset, just the metricName will be used to gather metrics.
  // +optional
  optional k8s.io.apimachinery.pkg.apis.meta.v1.LabelSelector selector = 4;