Envoy attributes as a source for Transformations

[jmunozro]

Version

1.14.x (latest stable)

Is your feature request related to a problem? Please describe.

I want to expose the value of an envoy attribute to dynamic metadata with a transformation. The intention is to be able to add logic in a later filter, using that information.

As an example, i'd like to read xds.route_name in a transformation, then save it to dynamic metadata, and be able to print it in the logs as %DYNAMIC_METADATA(com.test.my_filter:test_key)%

Describe the solution you'd like

Envoy attributes can be read in a transformation and saved to dynamic metadata

Describe alternatives you've considered

Lua filter

I would like to have an identification of the route, in order to refer to it as part of the dynamic metadata, the attribute xds.route_name contains the desired information. Other source for this value would work as a workaround for this particular use case, but we will probably hit this again eventually in the future.

Additional Context

No response

[github-actions]

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