...

Compatibility, Deprecation, and Migration Plan

• What impact (if any) will there be on existing users?

None

• If we are changing behavior how will we phase out the older behavior?

Existing mechanisms will continue to be supported. The new mechanisms can be enabled in the broker along with SASL/GSSAPI and SASL/PLAIN. Existing upgrade procedures for new SASL mechanisms (as currently described in the documentation) can be used to switch to SCRAM.

...