NtpServiceProperties (type)

{
  "additionalProperties": false, 
  "id": "NtpServiceProperties", 
  "properties": {
    "servers": {
      "items": {
        "$ref": "HostnameOrIPv4Address
      }, 
      "required": true, 
      "title": "NTP servers", 
      "type": "array"
    }, 
    "start_on_boot": {
      "default": true, 
      "required": false, 
      "title": "Start NTP service when system boots", 
      "type": "boolean"
    }
  }, 
  "title": "NTP Service properties", 
  "type": "object"
}