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{
  "apiKey": 63,
  "type": "request",
  "listeners": ["controller"],
  "name": "BrokerHeartbeatRequest",
  "validVersions": "0-1",
  "flexibleVersions": "10+",
  "fields": [
     ...
     { "name": "CordonedLogDirs", "type":  "[]uuid", "versions": "1+", "taggedVersions": "2+", 
       "tag": "1", "about": "Log directories that are cordoned." }
  ]
}