placeholder. Will create an experimental PR
This is supposed to be an implementation detail without istio user facing API change.
The side effects may include
1 unit test broken, will be addressed at inline PR
2. Envoy metric structure change.
3. debugging knowledge base update

Not longer block v2 to v3 because v3 supports bind_to_port by accident
Blocks:
#16458
V2 -> V3 API migration

Progress

• envoy

  • listener filter disable predicate: allow istio disable sniffer on well known port such as 3306
    listener: implement disabled predicates envoyproxy/envoy#10389
  • listener improvement: avoid to drain all the connections when updating on fat outbound virtual outbound listener is
    listener: split listenerfilterfactorycontext and networkfilterfactorycontext envoyproxy/envoy#10491
    worker: provide removeFilterChain interface envoyproxy/envoy#10528
    listener: in place filter chain update envoyproxy/envoy#10662

• istio

  • rewrite passthrough filter chain builder : listener: rewrite passthrough filter chain #23071
  • set dst port in non-passthough filter chain: listener: set destination port in filter chain match #23132
  • optional, build virtual outbound filter chain by aggregating bind_to_port virtual outbound listener
  • build virtual outbound listener from scratch