Custom notification content - Simple Log Service - Alibaba Cloud Documentation Center

Simple Log Service allows you to customize the content in alert notifications when you configure an alert template.

Available variables

When you configure an alert template, you can add variables to the title and body of the sample notification in the alert template. Before Simple Log Service pushes an alert notification, Simple Log Service replaces the variables with the actual values of the variables. For example, Simple Log Service replaces the {{ alert.project }} variable with the name of the project in which the alert is triggered.

Every time an alert is triggered, Simple Log Service generates a context for the alert and stores the context in the Results field. All fields in the Results field can be referenced as variables in the alert template. For more information, see Syntax for new alert templates and Variables in new alert templates.

Comparison of alert templates between the original and new alerting features

The new alerting feature supports both the syntax that is provided by the new alerting feature and the syntax that is provided by the original alerting feature. Compared with the syntax provided by the original alerting feature, the syntax provided by the new alerting feature supports more flexible, advanced custom rendering logic.

Functionality	New alerting feature	Original alerting feature
Reference methods	General fields: `{{ alert.project }}` Nested fields: `{{ alert.policy.alert_policy_id }}` Array elements: `{{ alert.results[0] }}` Array element fields: `{{ alert.results[0].query }}`	General fields: `${project}` Nested fields: `${policy.alert_policy_id}` Array elements: `${results[0]}` Array element fields: `${results[0].query}`
Template variables	The content is separated from the style. Variables provide the content. Control flows and functions are used to implement diverse styles. For more information, see Variables in new alert templates.	The content is not separated from the style. Both the content and the style are provided by variables. For more information, see Variables in original alert templates.
Control flows such as conditions and iterations	Control flows are supported. For more information, see Syntax for new alert templates.	Control flows are not supported.
Filter processing	Filter processing is supported. For more information, see Built-in functions in alert templates.	Filter processing is not supported.

Content formatting

DingTalk

Alert notifications over DingTalk support the Markdown syntax. The following elements are available:

Heading

# Level 1 heading
## Level 2 heading
### Level 3 heading
#### Level 4 heading
##### Level 5 heading
###### Level 6 heading

Reference

> A man who stands for nothing will fall for anything.

Bold and italic text
```
**bold**
*italic*
```
Link
```
[this is a link](http://example.com)
```
Image
```
![](http://example.com/pic.jpg)
```
Unordered list
```
- item1
- item2
```
Ordered list
```
1. item1
2. item2
```

Enterprise WeChat
Alert notifications over Enterprise WeChat support the Markdown syntax. The following elements are available:
Important
In alert notifications that are pushed over Enterprise WeChat, \n\n is rendered as \n. If you want to add a blank line between the lines in an alert notification, you must use \n\n\n.
- Heading
```
# Level 1 heading
## Level 2 heading
### Level 3 heading
#### Level 4 heading
##### Level 5 heading
###### Level 6 heading
```
- Bold text
```
**bold**
```
- Link
```
[This is a link](http://work.weixin.qq.com/api/doc)
```
- Inline code segment
```
`code`
```
- Reference
```
> Referenced text
```
- Font color
 Only three preconfigured colors are supported.
```
Green
Gray
Orange red
```
Lark
Alert notifications over Lark support the Markdown syntax. The following elements are available:
- Bold text
```
**Bold**
```
- Italic text
```
*Italic*
```
- Strikethrough text
```
~~Strikethrough~~
```
- Hyperlink
```
<a>https://open.feishu.cn</a>
```
- Text link
```
[Development documentation](https://open.feishu.cn)
```
- Image
```
![hover_text](image_key)
```
- Separator line
```
---
```
Slack
Incoming webhooks in Slack support only a part of the Markdown syntax. For more information, see Slack Markdown Reference.

Webhook

Webhooks can be used to push one or more alert notifications at a time.

Push one alert notification at a time:

{
  "Project": "${project}",
  "Alert name": "${alert_name}"
}

Combine and push multiple alert notifications at a time:

[
  {
    "Project": "project-name1",
    "Alert name": "alert-name1"
  },
  {
    "Project": "project-name2",
    "Alert name": "alert-name2"
  }
]

Email
Emails support HTML tags. For more information, see HTML. Examples:
- Use   as a line feed.
- Use <a href="${query_url}">Details</a> to add a link. You can click the link to view details about the alert.
- Use ${severity} to display the severity level of the alert in bold text.