Today, Envoy reports a human readable build version in Node messages when sending xDS requests, and also provides this in the SeverInfo message on the admin console. This is restrictive, since it does not provide detailed information on build details (e.g. was the build FIPS compliant?), version information needs to be parsed out of a string, it's not possible to know which extensions were included, etc.

A full treatment of the existing limitations and a proposal to evolve Envoy's feature/build/version proposal is available at:

https://docs.google.com/document/d/1RlYIzW-R1AtQSJlxAJlIpJEDnLM3a74pCIMrGwAqtNc/edit?usp=sharing

This is an early draft, looking to get feedback and evolve this to meet the community's needs.

CC @mattklein123 @PiotrSikora @mpuncel @snowp @mandarjog