{
  "apiKey": 69   String clientId,
  "type": "request",
  "listeners": ["broker"],
  "name": "ConsumerGroupDescribeRequest",
  "validVersions": "0-1",  <-- bump to 0-1 
  "flexibleVersions": "0+",
  "fields": [
    { "name": "GroupIds", "type": "[]string", "versions": "0+", "entityType": "groupId",
String host,
            "about": "The ids of the groups to describe" },
    { "name": "IncludeAuthorizedOperations", "type": "bool", "versions": "0+",
 MemberAssignment assignment,
                       "about": "Whether to include authorized operations." }
  ]
}

{
  "apiKey": 69,
  "type": "response",
  "name": "ConsumerGroupDescribeResponse",
  "validVersions": "0-1",  <-- bump to 0-1
  "flexibleVersions": "0+",
  // Supported errors:
  // - GROUP_AUTHORIZATION_FAILED (version 0+)
  // - NOT_COORDINATOR (version 0+)
  // - COORDINATOR_NOT_AVAILABLE (version 0+)
  // - COORDINATOR_LOAD_IN_PROGRESS (version 0+)
  // - INVALID_REQUEST (version 0+)
  // - INVALID_GROUP_ID (version 0+)
  // - GROUP_ID_NOT_FOUND (version 0+)
  "fields": [
    { "name": "ThrottleTimeMs", "type": "int32", "versions": "0+",      Optional<MemberAssignment> targetAssignment,
                             Optional<Integer> memberEpoch,
                             Optional<Boolean> upgraded
    ) {
        this.memberId = memberId == null ? "" : memberId;
        this.groupInstanceId = groupInstanceId;
      "about": "The durationthis.clientId in= millisecondsclientId for== whichnull the? request"" was: throttledclientId;
 due to a quota violation, or zero ifthis.host the= requesthost did== notnull violate? any quota." },
"" : host;
     { "name": "Groups", "type": "[]DescribedGroup", "versions": "0+",   this.assignment = assignment == null ?
      "about": "Each described group.",
   new   "fields": [MemberAssignment(Collections.emptySet()) : assignment;
        { "name": "ErrorCode", "type": "int16", "versions": "0+",
this.targetAssignment = targetAssignment;
        this.memberEpoch = memberEpoch;
   "about": "The describe error, or 0this.upgraded if= thereupgraded;
 was no error." },

    /**
    { "name": "ErrorMessage", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null",* @deprecated Since 4.0. Use {@link #MemberDescription(String, Optional, String, String, MemberAssignment, Optional, Optional, Optional)}.
     */
    @Deprecated
 "about": "The top-level error message, or null if there was no error." },
public MemberDescription(String memberId,
                      { "name": "GroupId", "type": "string", "versions": "0+", "entityType": "groupId" Optional<String> groupInstanceId,
          "about": "The group ID string." },
              { "name": "GroupState", "type": "string", "versions": "0+" String clientId,
          "about": "The group state string, or the empty string." },
                  { "name": "GroupEpoch", "type": "int32", "versions": "0+",
String host,
               "about": "The group epoch." },
             { "name": "AssignmentEpoch", "type": "int32", "versions": "0+",
MemberAssignment assignment,
              "about": "The assignment epoch." },
        { "name": "AssignorName", "type": "string", "versions": "0+",
    Optional<MemberAssignment> targetAssignment
    ) {
        this(
       "about": "The selected assignor." },
       memberId,
      { "name": "Members", "type": "[]Member", "versions": "0+" groupInstanceId,
          "about": "The members."clientId,
          "fields": [  host,
            { "name": "MemberId", "type": "string", "versions": "0+",
assignment,
            targetAssignment,
         "about": "The member ID." }Optional.empty(),
            Optional.empty()
 { "name": "InstanceId", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null",    );
    }

    /**
     * @deprecated Since 4.0.  "about": "The member instance ID." },
   Use {@link #MemberDescription(String, Optional, String, String, MemberAssignment, Optional, Optional, Optional)}.
     */
    { "name": "RackId", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null"@Deprecated
    public MemberDescription(
        String memberId,
        Optional<String> groupInstanceId,
     "about": "The member rack ID." }String clientId,
        String host,
   { "name": "MemberEpoch", "type": "int32", "versions": "0+",     MemberAssignment assignment
    ) {
        this(
      "about": "The current member epoch." }      memberId,
            { "name": "ClientId", "type": "string", "versions": "0+",
groupInstanceId,
            clientId,
        "about": "The client ID." }host,
            { "name": "ClientHost", "type": "string", "versions": "0+",
assignment,
            Optional.empty()
      "about": "The client host." }, );
    }

    /**
     * @deprecated Since 4.0. Use { "name": "SubscribedTopicNames", "type": "[]string", "versions": "0+", "entityType": "topicName",@link #MemberDescription(String, Optional, String, String, MemberAssignment, Optional, Optional, Optional)}.
      */
    @Deprecated
    public  "about": "The subscribed topic names." },
MemberDescription(String memberId,
                    { "name": "SubscribedTopicRegex", "type": "string", "versions": "0+", "nullableVersions": "0+", "default": "null" String clientId,
               "about": "the subscribed topic regex otherwise or null of not provided." },
    String host,
       { "name": "Assignment", "type": "Assignment", "versions": "0+",
              "about": "The currentMemberAssignment assignment.") },{
        this(memberId,    { "name": "TargetAssignment", "type": "Assignment", "versions": "0+",Optional.empty(), clientId, host, assignment);
    }

	// ...

	/**
	 * The epoch of the group member.
	  "about": "The target assignment." },*/
	public Optional<Integer> memberEpoch() {
		return memberEpoch;
	}

    /**
     * The flag { "name": "Protocol", "type": "string", "versions": "1+", "ignorable": true,indicating whether a member is classic.
     */
    public Optional<Boolean> upgraded() {
        "about": "The member protocol." }  <-- new field
          ]},
        { "name": "AuthorizedOperations", "type": "int32", "versions": "0+", "default": "-2147483648",
          "about": "32-bit bitfield to represent authorized operations for this group." }
      ]
    }
  ],
  "commonStructsreturn upgraded;
    }
}