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public class MemberDescription {
    private final String memberId;
    private final Optional<String> groupInstanceId;
    private final String clientId;
    private final String host;
    private final MemberAssignment assignment;
    private final Optional<MemberAssignment> targetAssignment;
    private final Optional<Integer> memberEpoch;
    private final String protocol;

	// ...

	/**
	 * The epoch of the group member.
	 */
	public Optional<Integer> memberEpoch() {
		return memberEpoch;
	}

    /**
     * The protocol of the group member.
     */
    public String protocol() {
        return protocol;
    }
}