public Builder maybeUpdateRebalanceTimeoutMs(OptionalInt rebalanceTimeoutMs) {
            this.rebalanceTimeoutMs = rebalanceTimeoutMs.orElse(this.rebalanceTimeoutMs);
            return this;
        }
A builder that facilitates the creation of a new member or the update of
an existing one.

Please refer to the javadoc of {{@link ConsumerGroupMember}} for the
definition of the fields.
group-coordinator/src/main/java/org/apache/kafka/coordinator/group/modern/consumer/ConsumerGroupMember.java