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Comment: Add clusterId to listMirrors

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Code Block
languagebash
$ bin/kafka-mirrors.sh --bootstrap-server :9094 --list
MIRROR                         TOPICS     SOURCE-BOOTSTRAP                                                                                                                 
my-mirror                      2          localhost:9091                                          CLUSTER-ID                 BOOTSTRAP-SERVER
my-mirror                      2          lBq12jYZRp-9wF3M9MPopg     localhost:9091,localhost:9092
new-mirror                   
new-mirror  1                   1     lBq12jYZRp-9wF3M9MPopg     localhost:9091,localhost:9092

Describe configured mirrors to check their lag compared to their source topics:

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Code Block
{
  "apiKey": TBD,
  "type": "response",
  "name": "ListMirrorsResponse",
  // Version 0 is the initial version.
  "validVersions": "0",
  "flexibleVersions": "0+",
  "fields": [
    { "name": "ThrottleTimeMs", "type": "int32", "versions": "0+", "ignorable": true,
      "about": "The 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 error code, or 0 if there was no error." },
    { "name": "Mirrors", "type": "[]ListedMirror", "versions": "0+",
      "about": "Each mirror in the response.", "fields": [
      { "name": "MirrorName", "type": "string", "versions": "0+", "entityType": "mirrorName",
        "about": "The cluster mirror name." },
      { "name": "SourceBootstrapTopicCount", "type": "stringint32", "versions": "0+", "default": "0",
        "about": "The source cluster bootstrap servers number of topics configured for this mirror. 0 indicates an empty mirror with no topics." },
      { "name": "TopicCountClusterId", "type": "int32string", "versions": "0+",
  "default      "about": "0"The source cluster ID." },
      { "name": "BootstrapServer", "abouttype": "string"The number of topics configured for this mirror. 0 indicates an empty mirror with no topics, "versions": "0+",
        "about": "The source cluster bootstrap servers." }
    ]}
  ]
}

DescribeMirrors

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