I will dedicate this is the tracking issue for the dynamic module feature. The description here will be updated as we make progress.
This issue will serve as a central place for tracking the progress as well as the feature requests, etc.

General Info

• The high-level documentation is here.
• The example repository: envoyproxy/envoy-dynamic-module-example
• Dynamic Modules slack channel: #envoy-dynamic-modules in Envoy slack

Released in v1.34

• (@mathetake) Add "remove header" callbacks. dynamic_modules: adds support for header removal #38432
  • I think making set_xxx_header/trailer callbacks accept null pointer indicating removal would be simpler'
• (@mathetake) Initial support for attributes dynamic_modules: initial support for attributes #38519
• (@mathetake) Remove "WIP" from the config API. api: removes 'wip' from dynamic_modules #38956
  • This will be by the end of next March.

Released in v1.35

• (@mathetake) Add a minimal test target here to ensure the linking work on macos. My attempt: build: make dynamic modules work on macos #38437
  • As indicated in chore: fix build on m1 mac #38363, macos linker doesn't support --export-dynamic so I suspect that the loading is not working right now. Since we are not running tests at all right now, I would like to add //test/extensions/dynamic_modules/http:filter_test there and fix the linker stuff accordingly.
• (@mathetake) Build a foundational asynchronous callback mechanism for dynamic modules. dynamic_modules: scheduler ABI for generic non-blocking async operations  #39765
  • Proper life cycle management via something like a manual new/delete callback would be needed to provide the safe interface.
• Callout related ABI. dynamic_modules: support for http callouts #39151

Released in v1.36

• Upstream HTTP filter support: Upstream HTTP Filter Support for Dynamic Modules #38448
• filter state: dynamic_modules: add filter state support for http filter #38979
• Add stats/metrics callbacks to allow dynamic modules to emit metrics. dynamic_modules: add support for user-defined metrics #40661 dynamic modules: support metrics with labels by defining metric vector counterparts #41003
• Logger API: dynamic modules: log ABI support #40143
• Terminal HTTP Filter

Other outstanding items / Open questions

• Network filter support
• Add more attributes implementation left as TODOs in dynamic_modules: initial support for attributes #38519
• Socket accessor: dynamic_modules: need a way to access underlying sockets in http filters #38739
• Other language SDKs (Notably, C, C++ or Zig, maybe Go.)
  • We have an experimental Go SDK https://github.com/envoyproxy/dynamic-modules-examples/tree/main/go
  • Discussion around the experimental SDKs: Add experimental/reference language SDK dynamic-modules-examples#25
• After all the feature requests settle down, revisit the compatibility requirement and maybe relax it to work across multiple versions of Envoy.