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# 13 利用Prometheus数据执行自动发现

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#### 概述

Prometheus中的数据格式适用于低级别自动发现。

关于Zabbix如何执行Prometheus数据的查询，请参考 [Prometheus检查](/manual/config/items/itemtypes/prometheus)。

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#### 配置

利用低级别自动发现规则创建一个 [依赖型监控项](/manual/config/items/itemtypes/dependent_items) ，附属于采集Prometheus数据的HTTP主监控项。

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##### Prometheus to JSON

在自动发现规则中, 找到预处理选项, 然后选择
*Prometheus to JSON* 这个预处理选项. 自动发现需要使用JSON格式的数据,  *Prometheus to JSON* 这个选项会返回所需的JSON格式, 并附带下列属性:

-   指标名称
-   指标值
-   帮助 (如果有)
-   类型(如果有)
-   标签(如果有)
-   原始行

例如, 需要查询 `wmi_logical_disk_free_bytes`:

![](../../../../../assets/en/manual/discovery/low_level_discovery/lld_rule_prom_json.png)

从这些Prometheus的行中执行上述查询:

    # HELP wmi_logical_disk_free_bytes Free space in bytes (LogicalDisk.PercentFreeSpace)
    # TYPE wmi_logical_disk_free_bytes gauge
    wmi_logical_disk_free_bytes{volume="C:"} 3.5180249088e+11
    wmi_logical_disk_free_bytes{volume="D:"} 2.627731456e+09
    wmi_logical_disk_free_bytes{volume="HarddiskVolume4"} 4.59276288e+08

会返回:

``` {.java}
[
    {
        "name": "wmi_logical_disk_free_bytes",
        "help": "Free space in bytes (LogicalDisk.PercentFreeSpace)",
        "type": "gauge",
        "labels": {
            "volume": "C:"
         },
        "value": "3.5180249088e+11",
        "line_raw": "wmi_logical_disk_free_bytes{volume=\"C:\"} 3.5180249088e+11"
    },
    {
        "name": "wmi_logical_disk_free_bytes",
        "help": "Free space in bytes (LogicalDisk.PercentFreeSpace)",
        "type": "gauge",
        "labels": {
            "volume": "D:"
         },
        "value": "2.627731456e+09",
        "line_raw": "wmi_logical_disk_free_bytes{volume=\"D:\"} 2.627731456e+09"
    },
    {
        "name": "wmi_logical_disk_free_bytes",
        "help": "Free space in bytes (LogicalDisk.PercentFreeSpace)",
        "type": "gauge",
        "labels": {
            "volume": "HarddiskVolume4"
         },
        "value": "4.59276288e+08",
        "line_raw": "wmi_logical_disk_free_bytes{volume=\"HarddiskVolume4\"} 4.59276288e+08"
    }
]
```

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##### 映射LLD宏

接下来需要找到LLD宏的选项并做下面的映射:

    {#VOLUME}=$.labels['volume']
    {#METRIC}=$['name']
    {#HELP}=$['help']

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##### 监控项原型

可以创建这样的监控项原型:

![](../../../../../assets/en/manual/discovery/low_level_discovery/lld_item_prototype_prom.png)

并配置预处理选项:

![](../../../../../assets/en/manual/discovery/low_level_discovery/lld_item_prototype_prom_b.png)

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