ibutes are generated by Envoy Proxies and obtained from Istio using Envoy&rsquo;s Node Metadata.
Envoy forwards Node Metadata to Peer Envoys using ALPN based tunneling and a prefix based protocol.
We define a new protocol <code>istio-peer-exchange</code>, that is advertised and prioritized by the client and the server sidecars
in the mesh. ALPN negotiation resolves the protocol to <code>istio-peer-exchange</code> for connections between Istio enabled
proxies, but not between an Istio enabled proxy and any o