# 告警模板详解

默认情况下Alertmanager使用了系统自带的默认通知模板，模板源码可以从<https://github.com/prometheus/alertmanager/blob/master/template/default.tmpl>获得。Alertmanager的通知模板基于[Go的模板系统](http://golang.org/pkg/text/template)。Alertmanager也支持用户定义和使用自己的模板，一般来说有两种方式可以选择。

第一种，基于模板字符串。用户可以直接在Alertmanager的配置文件中使用模板字符串，例如:

```
receivers:
- name: 'slack-notifications'
  slack_configs:
  - channel: '#alerts'
    text: 'https://internal.myorg.net/wiki/alerts/{{ .GroupLabels.app }}/{{ .GroupLabels.alertname }}'
```

第二种方式，自定义可复用的模板文件。例如，可以创建自定义模板文件custom-template.tmpl，如下所示：

```
{{ define "slack.myorg.text" }}https://internal.myorg.net/wiki/alerts/{{ .GroupLabels.app }}/{{ .GroupLabels.alertname }}{{ end}}
```

通过在Alertmanager的全局设置中定义templates配置来指定自定义模板的访问路径:

```
# Files from which custom notification template definitions are read.
# The last component may use a wildcard matcher, e.g. 'templates/*.tmpl'.
templates:
  [ - <filepath> ... ]
```

在设置了自定义模板的访问路径后，用户则可以直接在配置中使用该模板：

```
receivers:
- name: 'slack-notifications'
  slack_configs:
  - channel: '#alerts'
    text: '{{ template "slack.myorg.text" . }}'

templates:
- '/etc/alertmanager/templates/myorg.tmpl'
```


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