apiVersion: release-notes/v2
kind: feature
area: telemetry
releaseNotes:
- |
  **Added** xDS workload metadata discovery to TCP metadata exchange filter as a fallback. This requires enabling `PEER_METADATA_DISCOVERY` flag on the proxy, and `PILOT_ENABLE_AMBIENT_CONTROLLERS` on the control plane.

apiVersion: install.istio.io/v1alpha1
kind: IstioOperator
metadata:
  name: install
spec:
  meshConfig:
    defaultConfig:
      proxyMetadata:
        PEER_METADATA_DISCOVERY: "true"
  values:
    pilot:
      env:
        PILOT_ENABLE_AMBIENT: "true"
        PILOT_ENABLE_AMBIENT_WAYPOINTS: "true"

		"maximum number of HTTP/HTTPS request retries for pulling a Wasm module via http/https").Get()

	enableWDSEnv = env.Register("PEER_METADATA_DISCOVERY", false,
		"If set to true, enable the peer metadata discovery extension in Envoy").Get()

	envoyStatusPortEnv = env.Register("ENVOY_STATUS_PORT", 15021,
		"Envoy health status port value").Get()

	flag.BoolVar(&settingsFromCommandLine.Ambient, "istio.test.ambient", settingsFromCommandLine.Ambient,
		"Indicate the use of ambient mesh.")

	flag.BoolVar(&settingsFromCommandLine.PeerMetadataDiscovery, "istio.test.peer_metadata_discovery", settingsFromCommandLine.PeerMetadataDiscovery,
		"Force the use of peer metadata discovery fallback for metadata exchange")

		Revision:      args.Revision,
	}
	if i.ctx.Settings().Ambient {
		iArgs.InFilenames = append(iArgs.InFilenames, filepath.Join(testenv.IstioSrc, IntegrationTestAmbientDefaultsIOP))
	}
	if i.ctx.Settings().PeerMetadataDiscovery && len(args.ComponentName) == 0 {
		iArgs.InFilenames = append(iArgs.InFilenames, filepath.Join(testenv.IstioSrc, IntegrationTestPeerMetadataDiscoveryDefaultsIOP))
	}

	EnableDualStack bool

	// Helm repo to be used for tests
	HelmRepo string

	DisableDefaultExternalServiceConnectivity bool

	PeerMetadataDiscovery bool

	// GatewayConformanceStandardOnly indicates that only the standard gateway conformance tests should be run.
	GatewayConformanceStandardOnly bool