kubeClient, client, err := kubeClients(cliClient, l)
	if err != nil {
		l.LogAndFatal(err)
	}
	if oiArgs.common.revision == "default" {
		oiArgs.common.revision = ""
	}
	// Error here likely indicates Deployment is missing. If some other K8s error, we will hit it again later.
	already, _ := isControllerInstalled(kubeClient.Kube(), oiArgs.common.operatorNamespace, oiArgs.common.revision)
	if already {

Quite the opposite - an *aggressively* small feature set is the key feature that makes ztunnel viable.
It very intentionally does not offer L7 (HTTP) functionality, for instance, which would likely violate some of the goals above, without contributing to them.
Instead, the rich functionality that service mesh is traditionally associated with is deferred to the waypoints.

and it is possible to gradually move apps from Istio 1.0/1.1 to the new environments and
across environments ( for example canary -> prod )

Note: there are still some cluster roles that may need to be fixed, most likely cluster permissions
will need to move to the security component.

## Everything is Optional

Each component in the new installer is optional. Users can install the component defined in the new installer,

  - default-pool
' | kubectl apply --kubeconfig="$KUBECONFIG" -f -

}

function cidr_to_ips() {
    CIDR="$1"
    # cidr_to_ips returns a list of single IPs from a CIDR. We skip 1000 (since they are likely to be allocated
    # already to other services), then pick the next 100.
    python3 - <<EOF
from ipaddress import ip_network, IPv6Network;
from itertools import islice;

net = ip_network('$CIDR')

  // (controller -> IngressClass -> Ingress resource). Although the
  // `kubernetes.io/ingress.class` annotation (simple constant name) was never
  // formally defined, it was widely supported by Ingress controllers to create
  // a direct binding between Ingress controller and Ingress resources. Newly
  // created Ingress resources should prefer using the field. However, even

  // risky unless you take great care to run this webhook on all hosts
  // which run an apiserver which might need to make calls to this
  // webhook. Such installs are likely to be non-portable, i.e., not easy
  // to turn up in a new cluster.
  //
  // The scheme must be "https"; the URL must begin with "https://".
  //
  // A path is optional, and if present may be any string permissible in

  // risky unless you take great care to run this webhook on all hosts
  // which run an apiserver which might need to make calls to this
  // webhook. Such installs are likely to be non-portable, i.e., not easy
  // to turn up in a new cluster.
  //
  // The scheme must be "https"; the URL must begin with "https://".
  //
  // A path is optional, and if present may be any string permissible in

// +protobuf=true
// +k8s:openapi-gen=true
message Unknown {
  optional TypeMeta typeMeta = 1;

  // Raw will hold the complete serialized object which couldn't be matched
  // with a registered type. Most likely, nothing should be done with this
  // except for passing it through the system.
  optional bytes raw = 2;

  // ContentEncoding is encoding used to encode 'Raw' data.
  // Unspecified means no encoding.

	if defaultCNIConfigFilepath != cniConfigFilepath {
		if len(cfg.CNIConfName) > 0 || !cfg.ChainedCNIPlugin {
			// Install was run with overridden CNI config file so don't error out on preempt check
			// Likely the only use for this is testing the script
			installLog.Warnf("CNI config file %s preempted by %s", cniConfigFilepath, defaultCNIConfigFilepath)
		} else {

#### CRD Watcher

For watches against custom types (CRDs), we want to gracefully handle missing CRDs. Naively starting informers against the missing types would result in errors and blocking startup. Instead, we introduce a "CRD Watcher" component that watches the CRDs in the cluster to determine if they are available or not.