This document describes the high level architecture of the Istio control plane, Istiod.
Istiod is structured as a modular monolith, housing a wide range of functionality from certificate signing, proxy configuration (XDS), traditional Kubernetes controllers, and more.

## Proxy Configuration

Istiod's primary role - and most code - is to dynamically configure proxies (Envoy sidecars and ingress, gRPC, ztunnel, and more). This roughly consists of 3 parts:

  <build>
    <plugins>
      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <configuration>
          <archive>
            <manifestEntries>
              <Automatic-Module-Name>com.google.common.util.concurrent.internal</Automatic-Module-Name>
            </manifestEntries>
          </archive>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-source-plugin</artifactId>

            final PlexusConfiguration configuration,
            final ExpressionEvaluator evaluator,
            final ClassRealm realm,
            final ConfigurationListener listener)
            throws ComponentConfigurationException {
        try {
            ClassRealmConverter.pushContextRealm(realm);

            this.configureComponent(component, configuration, evaluator, (ClassLoader) realm, listener);

      <vendor>sun</vendor>
    </provides>
    <configuration>
      <jdkHome>/path/to/jdk/1.5</jdkHome>
    </configuration>
  </toolchain>
  <toolchain>
    <type>jdk</type>
    <provides>
      <version>1.6</version>
      <vendor>sun</vendor>
    </provides>
    <configuration>
      <jdkHome>/path/to/jdk/1.6</jdkHome>
    </configuration>
  </toolchain>

  -->

         <vendor>sun</vendor>
     </provides>
     <configuration>
        <jdkHome>${env.JAVA_HOME}</jdkHome>
     </configuration>
  </toolchain>
  <toolchain>
     <type>jdk</type>
     <provides>
         <version>1.6</version>
         <vendor>sun</vendor>
     </provides>
     <configuration>
        <jdkHome>${env.JAVA_HOME}</jdkHome>
     </configuration>
  </toolchain>

name: Go Telemetry Proposals
description: Changes to the telemetry upload configuration
title: "x/telemetry/config: proposal title"
labels: ["Telemetry-Proposal"]
projects: ["golang/29"]
body:
- type: textarea
  attributes:
    label: Summary
    description: >
      What change are you proposing to the upload configuration, and why?
      For new upload configuration, which new counters will be collected, what

            XmlNode configuration = extension.getConfiguration();
            if (configuration == null) {
                configuration = new XmlNodeImpl("configuration");
            }
            Function<String, String> cb = Interpolator.memoize(callback);
            Function<String, String> it = s -> interpolator.interpolate(s, cb);
            configuration = new ExtensionInterpolator(it).transform(configuration);

         <vendor>sun</vendor>
     </provides>
     <configuration>
        <jdkHome>${env.JAVA_HOME}</jdkHome>
        <toolsJar>lib/tools.jar</toolsJar>
     </configuration>
  </toolchain>
  <toolchain>
     <type>jdk</type>
     <provides>
         <version>1.6</version>
         <vendor>sun</vendor>
     </provides>
     <configuration>
        <jdkHome>${env.JAVA_HOME}</jdkHome>

              </params>
            </configuration>
          </execution>
          <execution>
            <id>modello-site-docs</id>
            <goals>
              <goal>xdoc</goal>
              <goal>xsd</goal>
            </goals>
            <phase>generate-resources</phase>
            <configuration>
              <version>2.0.0</version>
              <models>

				<version>3.4.1</version>
				<configuration>
					<encoding>UTF-8</encoding>
					<docencoding>UTF-8</docencoding>
					<charset>UTF-8</charset>
					<source>8</source>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-jar-plugin</artifactId>
				<version>3.3.0</version>
				<configuration>
					<archive>
						<manifestEntries>