public static MemberState fromValue(byte value) {
        MemberState state = VALUES_TO_ENUMS.get(value);
        if (state == null) {
            return UNKNOWN;
        }
        return state;
    }
The member is in an unknown state. This can only happen if a future
version of the software introduces a new state unknown by this version.
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/MemberState.java