# 告警通知模板

### 什么是告警通知模板？

ChainBot 平台中，告警通知模板本质为一串字符串，没有长度限制。每当用户创建 Bot 时，都会生成一个默认的告警通知模板，用户需要根据自身需求，变更告警通知模板中的关键词，同时可以根据每种 Bot 监控类型变更注入变量。

以下为告警通知模板示例：

```
[ {$bot.name} ]
  Contract: {$event.contract}
  Time: {$block.time}
  Explore: {$chain.explore}/tx/{$tx.hash}
  Created By ChainBot.io
```

其中例如 “Contract” 为方便用户阅读的关键词，“{$event.contract}” 为模板变量。其中模板变量必须使用 "{}" 包括起来。

[了解不同 Bot 监控支持的注入变量？](/zh/advanced-features/alarm-notification-template/message-template.md)

### 告警通知模板高级功能

> 使用该部分功能，用户需要有初级的编程技能。

#### 1. 格式化时间

```javascript
// 格式化时区至用户设定的时区
timezone($block.time, 8)
```

#### 2. 四则运算

```javascript
"123000000000000000000" / 1e18 == 123
"1" + "1" + 1 == 3
2 - 1 == 1
2 * 2 == 4
```

#### 3. 取整运算

```
{ round(1000000000001000000 / 1e18, 1)}
```

#### 复杂告警模板示例

```
[{$subscription.name}]
Block: {$block.number}
Values: {$values._reserve0 / 1e18} / {$values._reserve1 / 1e18} = {$values.percent}
Condition: {$condition}
Time: {$block.time}

```


---

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```
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