examples/watch/update.json

{
  "action": "update",
  "instance": {
    "hostName": "lfgy11",
    "serviceUuid": "0b2b537b-a23c-4166-8322-15aabb707e40",
    "port": {},
    "securePort": {},
    "dataCenterInfo": {
      "metadata": {}
    },
    "leaseInfo": {},
    "metadata": {
      "a1": "a2",
      "test": "test2"
    }
  }
}