创建警报阈值

创建警报阈值。

请求示例：

POST /api/alert/v1/thresholds HTTP/1.1
Host: zfs-storage.example.com
X-Auth-User: root
X-Auth-Key: letmein
Content-Type: application/json
Content-Length: 50

{"statname": "datalink.kilobytes", "limit": 100000}

响应示例：

HTTP/1.1 201 Created
X-Zfssa-Appliance-Api: 1.0
Content-Type: application/json
Content-Length: 321
Location: /api/alert/v1/thresholds
          /1b15d405-75c4-4c0c-e0f6-8a108165b874

{
    "threshold": {
        "href": "/api/alert/v1/alerts/thresholds
                 /1b15d405-75c4-4c0c-e0f6-8a108165b874",
        ...
    }
}