Envoy currently provides extension mechanisms based on WASM and Lua. Approach for GoLang is under discussion as well: #15152.

Taking into account that small footprint, high performance are essential for using Envoy as a sidecar and ongoing work on GoLang extension (#22573), it looks reasonable to work on support for extension mechanism based on dynamic loading as well. For example, for using Rust as the language for creating custom filters (#12155). Envoy already has support for dynamically loading opentracing libraries: #2252.

What's your opinion regarding introducing such an extension mechanism for HTTP filters?