Users should not create instances of `ConsumerGroupMetadata`, and this class should not have any public constructor.

Ideally, it would only be an interface. We should do a KIP an deprecate both constructors, and make it an interface in AK 5.0 release.

Status

Current state: Under Discussion

Discussion thread: here

JIRA: here

Motivation

Describe the problems you are trying to solve.

Public Interfaces

• org/apache/kafka/clients/consumer/ConsumerGroupMetadata

Proposed Changes

Describe the new thing you want to do in appropriate detail. This may be fairly extensive and have large subsections of its own. Or it may be a few sentences. Use judgement based on the scope of the change.

Compatibility, Deprecation, and Migration Plan

• What impact (if any) will there be on existing users?
• If we are changing behavior how will we phase out the older behavior?
• If we need special migration tools, describe them here.
• When will we remove the existing behavior?

Test Plan

Describe in few sentences how the KIP will be tested. We are mostly interested in system tests (since unit-tests are specific to implementation details). How will we know that the implementation works as expected? How will we know nothing broke?

Rejected Alternatives

If there are alternative ways of accomplishing the same thing, what were they? The purpose of this section is to motivate why the design is the way it is and not some other way.