istioctl x internal-debug syncz --xds-label istio.io/rev=default
`,
		RunE: func(c *cobra.Command, args []string) error {
			kubeClient, err := ctx.CLIClientWithRevision(opts.Revision)
			if err != nil {
				return err
			}
			if len(args) == 0 {
				return util.CommandParseError{
					Err: fmt.Errorf("debug type is required"),
				}
			}

	return
}

func (c *ConfigWriter) getUserAgentVersionInfo(bootstrapDump *adminv3.BootstrapConfigDump) string {
	const (
		buildLabelKey = "build.label"
		buildTypeKey  = "build.type"
		statusKey     = "revision.status"
		sslVersionKey = "ssl.version"
	)

	var (
		buildVersion = bootstrapDump.GetBootstrap().GetNode().GetUserAgentBuildVersion()
		version      = buildVersion.GetVersion()

 * domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

/*
 * Source:
 * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/test/tck-jsr166e/AtomicDoubleTest.java?revision=1.8
 * (Modified to adapt to guava coding conventions)
 */

package com.google.common.util.concurrent;

import static com.google.common.truth.Truth.assertThat;
import static java.lang.Math.max;

    ksd--"External Istiod"-->nsc
    ksd--"External Istiod"-->iwhc

    df("Discovery Filter")

    axc("Auto Export Controller")

    mcfg("Mesh Config")
    dfc("Default Revision Controller")
```

As you can see, the landscape of controllers is pretty extensive at this point.

}

func run(c *cobra.Command, ctx cli.Context, args []string) error {
	log.Debugf("metrics command invoked for workload(s): %v", args)

	client, err := ctx.CLIClientWithRevision(metricsOpts.Revision)
	if err != nil {
		return fmt.Errorf("failed to create k8s client: %v", err)
	}

	pl, err := client.PodsForSelector(context.TODO(), ctx.IstioNamespace(), "app.kubernetes.io/name=prometheus")
	if err != nil {

          }

          // We have a task to execute when we complete the loop.
          else -> {
            readyTask = candidate
          }
        }
      }

      // Implement the decision.
      when {
        // We have a task ready to go. Get ready.
        readyTask != null -> {
          beforeRun(readyTask)

          // Also start another thread if there's more work or scheduling to do.

![SDS decision flow](docs/sds-flow.svg)

### Default CA Flow through istio-agent

![CA Flow](docs/ca.svg)

A single SDS request from Envoy goes through a few different layers in istio-agent.

 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/publicdomain/zero/1.0/
 */

/*
 * Source:
 * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/jsr166e/Striped64.java?revision=1.9
 */

package com.google.common.cache;

import com.google.common.annotations.GwtIncompatible;
import java.lang.reflect.Field;
import java.security.AccessController;

 * http://creativecommons.org/publicdomain/zero/1.0/
 */

/*
 * Source:
 * http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/jsr166e/extra/AtomicDoubleArray.java?revision=1.5
 * (Modified to adapt to guava coding conventions and
 * to use AtomicLongArray instead of sun.misc.Unsafe)
 */

package com.google.common.util.concurrent;

 * and the last 7 bits from this byte.
 *
 * The end of the range is not encoded, but can be inferred by looking at the start of the range
 * that follows.
 *
 * b1
 * --
 *
 * This is either a mapping decision or the length of the mapped output, according to this table:
 *
 * ```
 *  0..63 : Length of the UTF-16 sequence that this range maps to. The offset is b2b3.