# PeerAuthentication Implementation in Ambient

        - has a istio-proxy container, with first 2 args "proxy" and "sidecar" - or less then 2 args, or first arg not proxy.
        - "sidecar.istio.io/inject" is not false
        - "sidecar.istio.io/status" exists

### Redirect API

The annotation based control is currently only supported in 'sidecar' mode. See plugin/redirect.go for details.

* 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.
Quite the opposite - an *aggressively* small feature set is the key feature that makes ztunnel viable.

	// applying is not done here, but we are looser with checks when doing generate.
	Generate bool
	// Overwrite removes analysis checks around existing webhooks.
	Overwrite bool
	// AutoInjectNamespaces controls, if the sidecars should be injected into all namespaces by default.
	AutoInjectNamespaces bool
	// CustomLabels are labels to add to the generated webhook.
	CustomLabels map[string]string

				if err != nil {
					return nil, fmt.Errorf("could not unmarshal Node: %w", err)
				}
				meta, err := model.ParseMetadata(node.Metadata)
				if err != nil || meta.ProxyConfig == nil {
					// Skip non-sidecars (e.g. istioctl queries)
					continue
				}
				pi = append(pi, istioVersion.ProxyInfo{
					ID:           node.Id,
					IstioVersion: getIstioVersionFromXdsMetadata(node.Metadata),
				})

During new Pod startup, we MUST meet the constraint that the network is ready the instant the application starts (including `initContainers`!).
This is critical -- issues around this were the [top issue with sidecars](https://github.com/istio/istio/issues/11130).

### Pod Startup Implementation

The key mechanism to maintain this property is the CNI plugin.

revision tag, use 'kubectl label namespace <NAMESPACE> istio.io/rev=%s'
`
	webhookNameHelpStr          = "Name to use for a revision tag's mutating webhook configuration."
	autoInjectNamespacesHelpStr = "If set to true, the sidecars should be automatically injected into all namespaces by default"
)

// options for CLI
var (
	// revision to point tag webhook at
	revision             = ""
	manifestsPath        = ""

    app: istio-pilot
    chart: istio
    heritage: Tiller
    release: istio
  name: sidecars.networking.istio.io
spec:
  group: networking.istio.io
  names:
    categories:
    - istio-io
    - networking-istio-io
    kind: Sidecar
    listKind: SidecarList
    plural: sidecars
    singular: sidecar
  scope: Namespaced
  versions:
  - name: v1
    schema:
      openAPIV3Schema:

	needsRestart int
}

func Cmd(cliContext cli.Context) *cobra.Command {
	cmd := &cobra.Command{
		Use:     "injector",
		Short:   "List sidecar injector and sidecar versions",
		Long:    `List sidecar injector and sidecar versions`,
		Example: `  istioctl experimental injector list`,
		Args: func(cmd *cobra.Command, args []string) error {
			if len(args) != 0 {

	whcName             string
	iopFilename         string
)

const (
	defaultMeshConfigMapName       = "istio"
	defaultInjectConfigMapName     = "istio-sidecar-injector"
	defaultInjectWebhookConfigName = "istio-sidecar-injector"
	defaultWebhookName             = "sidecar-injector.istio.io"
)

func InjectCommand(cliContext cli.Context) *cobra.Command {
	var opts clioptions.ControlPlaneOptions