Ability to add JWT Subject in the message header or key

[xmlking]

To enforce data integrity and authenticity of a message, it would be nice to automatically add sub field of the JWT to message (header or key). later we could use this sub field of message to link Payload to trusted ClientId

Without this level of integrity, a client could impersonate as other client and send fallacy data.

[xmlking]

and only enable this feature when JWT is enabled.

Do you see need for adding kafka style headers feature for Publishers to sending some arbitrary metadata (JDONB) along with key and value in the message?

[alice-viola]

Sorry for the long implementation time.
The feature requested is now part of 0.13.0 release.
https://smartpricing.github.io/queen/server/authentication.html#producer-identity-stamping-producersub