{
  "apiKey": 60,
   [
   { "name": "TopicName", "type": "stringresponse",
  "versionsname": "0+DescribeClusterResponse", "entityType": "topicName",
     "about": "The topic name." },
   { "name": "Partitions", "type": "[]PartitionData",
     "versions
  //
  // Version 1 adds the EndpointType field, and makes MISMATCHED_ENDPOINT_TYPE and
  // UNSUPPORTED_ENDPOINT_TYPE valid top-level response error codes.
  // Version 2 adds IsFenced field to Brokers for KIP-1073 support.
  //
  "validVersions": "0-2",
  "flexibleVersions": "0+",
  "fields": [
     { "name": "PartitionIndexThrottleTimeMs", "type": "int32", "versions": "0+",
       "about": "The partition index duration in milliseconds for which the request was throttled due to a quota violation, or zero if the request did not violate any quota." },
     { "name": "ErrorCode", "type": "int16", "versions": "0+",
      "about": "The top-level error code, or 0 if there was no error" },
     { "name": "ErrorMessage", "type": "string", "versions": "20+", "nullableVersions": "20+", "ignorabledefault": true"null",
       "about": "The top-level error message, or null if there was no error." },
     { "name": "LeaderIdEndpointType", "type": "int32int8", "versions": "01+", "entityTypedefault": "brokerId1",
       "about": "The IDendpoint oftype thethat current leader or -1 if the leader is unknown."was described. 1=brokers, 2=controllers." },
     { "name": "LeaderEpochClusterId", "type": "int32string", "versions": "0+",
       "about": "The latest known leader epoch"cluster ID that responding broker belongs to." },
     { "name": "HighWatermarkControllerId", "type": "int64int32", "versions": "0+"},
     { "namedefault": "CurrentVoters-1", "typeentityType": "[]ReplicaStatebrokerId",
      "versionsabout": "0+The ID of the controller broker." },
     { "name": "ObserversBrokers", "type": "[]ReplicaStateDescribeClusterBroker", "versions": "0+",
       "about": "ObserversEach that are actively fetching frombroker in the leaderresponse."},
     // new added InactiveObservers field
"fields": [
        { "name":  "InactiveObserversBrokerId", "type": "[]ReplicaStateint32", "versions": "30+", "defaultmapKey": nulltrue, "entityType": "brokerId",
 
       "about": "ObserversThe thatbroker have not been active for a while"}
ID." },
    ]}
 ]},
 { "name": "NodesHost", "type": "[]Nodestring", "versions": "20+",
        "fieldsabout": [ "The broker hostname." },
      { "name": "NodeIdPort", "type": "int32", "versions": "20+",
     "mapKey": true, "entityType": "brokerId", "about": "The ID of the associated nodebroker port." },
      { "name": "ListenersRack", "type": "[]Listenerstring",
     "aboutversions": "The listeners of this controller0+", "versionsnullableVersions": "20+", "fieldsdefault": ["null",
     { "name": "Name", "typeabout": "string", "versions": "2+", "mapKey": true,
       "about": "The name of the endpoint" },
The rack of the broker, or null if it has not been assigned to a rack." },
      //NEW FIELD
      { "name": "HostIsFenced", "type": "stringbool", "versions": "2+", 
        "about": "The hostnameWhether the broker is fenced" }
    ]},
     { "name": "PortClusterAuthorizedOperations", "type": "uint16int32", "versions": "20+",
  "default": "-2147483648",
      "about": "The port32-bit bitfield to represent authorized operations for this cluster." }
   ]
}

public class DescribeClusterOptions extends AbstractOptions<DescribeClusterOptions> {
 ]}
],
"commonStructs": [
 { "name": "ReplicaState", "versions": "0+", "fields": [
   { "name": "ReplicaId", "type": "int32", "versions": "0+", "entityType": "brokerId" },
   { "name": "ReplicaDirectoryId", "type": "uuid", "versions": "2+" },
   { "name": "LogEndOffset", "type": "int64", "versions": "0+",
     "about": "The last known log end offset of the follower or -1 if it is unknown"},
   { "name": "LastFetchTimestamp", "type": "int64", "versions": "1+", "ignorable": true, "default": -1,
     "about": "The last known leader wall clock time when a follower fetched from the leader. This is reported as -1 both for the current leader or if it is unknown for a voter"},
   { "name": "LastCaughtUpTimestamp", "type": "int64", "versions": "1+", "ignorable": true, "default": -1,
     "about": "The leader wall clock appends the time of the offset for which the follower made the most recent fetch request. This is reported as the current time for the leader and -1 if unknown for a voter"}
 ]}
]