at , I see that Mixer is being deprecated. The small textbox at  mentions that the Mixer functionality is moving into Envoy.
What exactly is moving into the Envoy proxy? As of Istio 1.4, Mixer can do denials based on attributes, such as IPs, or headers. Where is this functionality moving? Is there any documentation I could read? I found nothing over at .
For example, right now, I can set Mixer to only allow ingress through ingress-gateway to a particular pod from IP x.x.x.x. No other IPs can GET the route. Where is this functionality moving to?
Any resources and help welcome!