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{
 "apiKey": 3,
 "type": "request",
 "listeners": ["broker"],
 "name": "MetadataRequest",
 "validVersions": "0-14",
 "flexibleVersions": "9+",
 "fields": [
   // In version 0, an empty array indicates "request metadata for all topics."  In version 1 and
   // higher, an empty array indicates "request metadata for no topics," and a null array is used to
   // indicate "request metadata for all topics."
   //
   // Version 2 and 3 are the same as version 1.
   //
   // Version 4 adds AllowAutoTopicCreation.
   //
   // Starting in version 8, authorized operations can be requested for cluster and topic resource.
   //
   // Version 9 is the first flexible version.
   //
   // Version 10 adds topicId and allows name field to be null. However, this functionality was not implemented on the server.
   // Versions 10 and 11 should not use the topicId field or set topic name to null.
   //
   // Version 11 deprecates IncludeClusterAuthorizedOperations field. This is now exposed
   // by the DescribeCluster API (KIP-700).
   // Version 12 supports topic Id.
   // Version 13 supports top-level error code in the response.
   // Version 14 supports Diskless and allows to send client.rack
   { "name": "Topics", "type": "[]MetadataRequestTopic", "versions": "0+", "nullableVersions": "1+",
     "about": "The topics to fetch metadata for.", "fields": [
     { "name": "TopicId", "type": "uuid", "versions": "10+", "ignorable": true, "about": "The topic id." },
     { "name": "Name", "type": "string", "versions": "0+", "entityType": "topicName", "nullableVersions": "10+",
       "about": "The topic name." }
   ]},
   { "name": "AllowAutoTopicCreation", "type": "bool", "versions": "4+", "default": "true", "ignorable": false,
     "about": "If this is true, the broker may auto-create topics that we requested which do not already exist, if it is configured to do so." },
   { "name": "IncludeClusterAuthorizedOperations", "type": "bool", "versions": "8-10",
     "about": "Whether to include cluster authorized operations." },
   { "name": "IncludeTopicAuthorizedOperations", "type": "bool", "versions": "8+",
     "about": "Whether to include topic authorized operations." },
   { "name": "RackId", "type":  "string", "versions": "14+", "default": "", "ignorable": true,
     "about": "Rack ID of the client making this request."}
 ]
}