architecture/ambient                                             @istio/wg-networking-maintainers-pilot @istio/wg-networking-maintainers-ztunnel
architecture/environments                                        @istio/wg-environments-maintainers
architecture/networking                                          @istio/wg-networking-maintainers

testing/soak/                           @gradle/bt-support

# Cross-cutting architecture checks and decisions
.github/CODEOWNERS                          @gradle/bt-architecture-council
architecture/                               @gradle/bt-architecture-council
testing/architecture-test                   @gradle/bt-architecture-council

# Core automation platform (core/configuration)

SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
REPO_ROOT="$(dirname "$(dirname "${SCRIPT_DIR}")")"

LOCAL_ARCH=$(uname -m)

# Pass environment set target architecture to build system
if [[ ${TARGET_ARCH} ]]; then
    # Target explicitly set
    :
elif [[ ${LOCAL_ARCH} == x86_64 ]]; then
    TARGET_ARCH=amd64
elif [[ ${LOCAL_ARCH} == armv8* ]]; then
    TARGET_ARCH=arm64

### Container Images

All container images are available as manifest lists and support the described
architectures. It is also possible to pull a specific architecture directly by
adding the "-$ARCH" suffix  to the container image name.

name | architectures
---- | -------------

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.
For various reasons outside the scope of this document, there is a desire to move from a sidecar based architecture to a "remote proxy" architecture.

    <!-- Ignore constant name for architecture tests since we want to use snake case there -->
    <suppress checks="ConstantName"
              files=".*[/\\]architecture-test[/\\]src[/\\]test[/\\]java[/\\]org[/\\]gradle[/\\].+" />
    <suppress checks="ConstantName"
              files=".*[/\\]internal-architecture-testing[/\\]src[/\\]main[/\\]java[/\\]org[/\\]gradle[/\\].+" />

### Container Images

All container images are available as manifest lists and support the described
architectures. It is also possible to pull a specific architecture directly by
adding the "-$ARCH" suffix  to the container image name.

name | architectures
---- | -------------

    "name": "api-metadata",
    "path": "platforms/core-configuration/api-metadata",
    "unitTests": false,
    "functionalTests": false,
    "crossVersionTests": false
  },
  {
    "name": "architecture-test",
    "path": "testing/architecture-test",
    "unitTests": true,
    "functionalTests": false,
    "crossVersionTests": false
  },
  {
    "name": "base-asm",
    "path": "platforms/core-runtime/base-asm",

### Container Images

All container images are available as manifest lists and support the described
architectures. It is also possible to pull a specific architecture directly by
adding the "-$ARCH" suffix  to the container image name.

name | architectures
---- | -------------

/**
 * OS support
 */
public class Os {

    /**
     * The OS Name.
     */
    public static final String OS_NAME = System.getProperty("os.name").toLowerCase(Locale.ENGLISH);

    /**
     * The OA architecture.
     */
    public static final String OS_ARCH = System.getProperty("os.arch").toLowerCase(Locale.ENGLISH);

    /**
     * The OS version.
     */