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{
  "apiKey": 1,
  "type": "coordinator-key",
  "name": "LastMirroredOffsetsKey",
  "validVersions": "0",
  "flexibleVersions": "none",
  "fields": [
    { "name": "MirrorName", "type": "string", "versions": "0",
      "about": "The cluster mirror name."}
  ]
}

{
  "apiKey": 1,
  "type": "coordinator-value",
  "name": "LastMirroredOffsetsValue",
  "validVersions": "0",
  "flexibleVersions": "0+",
  "fields": [
    { "name": "Topics", "type": "[]Topic", "versions": "0+",
      "about": "The mirror topics for which we want to store the last mirrored offsets.",  "fields": [
      { "name": "Name", "type": "string", "versions": "0",
        "about": "The topic name." },
      { "name": "Partitions", "type": "[]Partition", "versions": "0+",
        "about": "Each partition to record the last mirrored offsets.", "fields": [
        { "name": "PartitionIndex", "type": "int32", "versions": "0+",
          "about": "The partition index." },
        { "name": "LastMirroredOffset", "type": "int64", "versions": "0+",
          "about": "The last mirrored offset for this partition." },
        { "name": "LeaderEpoch", "type": "int32", "versions": "0+", "default": "-1",
          "about": "The leader epoch of the last mirrored offset." }
      ]}
    ]}
  ]
}