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{
  "apiKey": 27,
  "type": "request",
  "listeners": ["broker"],
  "name": "WriteTxnMarkersRequest",
  "validVersions": "1-2",
  "flexibleVersions": "1+",
  "fields": [
    { "name": "Markers", "type": "[]WritableTxnMarker", "versions": "0+",
      "about": "The transaction markers to be written.", "fields": [
      { "name": "ProducerId", "type": "int64", "versions": "0+",
        "entityType": "producerId", "about": "The current producer ID." },
      { "name": "ProducerEpoch", "type": "int16", "versions": "0+",
        "about": "The current epoch associated with the producer ID." },
      { "name": "TransactionResult", "type": "bool", "versions": "0+",
        "about": "The result (false = ABORT, true = COMMIT)." },
      { "name": "Topics", "type": "[]WritableTxnMarkerTopic", "versions": "0+",
        "about": "Each topic to write markers for.", "fields": [
        { "name": "Name", "type": "string", "versions": "0+",
          "entityType": "topicName", "about": "The topic name." },
        { "name": "PartitionIndexes", "type": "[]int32", "versions": "0+",
          "about": "Partition indexes to write markers for." }
      ]},
      { "name": "CoordinatorEpoch", "type": "int32", "versions": "0+",
        "about": "Epoch of the transaction state partition hosting this coordinator." },
      // --------- NEW FIELD (TV) ADDED BELOW --------
      { "name": "TransactionVersion", "type": "int8", "versions": "2+", "ignorable": true,
        "about": "Transaction version: 0/1 = legacy (TV0/TV1), 2 = TV2.", "default": "0" }
    ]}
  ]
}