# Ztunnel

This document provides an overview of the architecture and design decisions around Ztunnel, the node-proxy component in ambient mode.

## Background and motivation

Motivations to implement ztunnel generally came from two areas.

First, and most importantly, it serves as a means to implement the real goal: waypoints.

  // metadata.finalizers and the resource-specific default policy.
  // Acceptable values are: 'Orphan' - orphan the dependents; 'Background' -
  // allow the garbage collector to delete the dependents in the background;
  // 'Foreground' - a cascading policy that deletes all dependents in the
  // foreground.
  // +optional
  optional string propagationPolicy = 4;

# Istio operator code overview

## Introduction

This document covers primarily the code, with some background on how the design maps to it.
See the
[design doc](https://docs.google.com/document/d/11j9ZtYWNWnxQYnZy8ayZav1FMwTH6F6z6fkDYZ7V298/edit#heading=h.qex63c29z2to)
for a more complete design description. The operator code is divided roughly into five areas:

1. [IstioOperatorSpec API](#istiooperatorspec-api) and related infrastructure, which is expressed as a