获取警报操作

此命令类似于列出警报操作命令，但此命令仅返回指定的警报操作。

请求示例：

GET /api/alert/v1/actions/actions-002 HTTP/1.1

响应示例：

HTTP/1.1 200 OK
X-Zfssa-Appliance-Api: 1.0
Content-Type: application/json
Content-Length: 331

{
    "action": {
        "category": "thresholds",
        "href": "/api/alert/v1/actions/actions-002",
        "action-000": {
                "address": "Joe.Admin@acme.com",
                "handler": "email",
                "href": "/api/alert/v1/alerts/actions/actions-002
                         /action-000",
                "subject": "CPU Busy"
        },
        "thresholdid": "b182ca05-53d3-6604-b874-ec353335704d"
    }
}