# istio_wds.yaml
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.
  **Added** a flag `PILOT_DISABLE_MX_ALPN` on the control plane to disable advertising TCP metadata exchange ALPN token `istio-peer-exchange`.