《Prometheus Alertmanager：告警规则与通知配置》（422）

# 🔥 **Prometheus Alertmanager：告警规则与通知配置** 

在现代监控系统中，**Prometheus** 是广泛使用的开源监控工具，而 **Alertmanager** 则是其告警管理核心组件 🚨。它负责处理 Prometheus 生成的告警，并进行去重、分组和路由，最终通过邮件、Slack、Webhook 等方式通知运维团队。 

## 📌 **告警规则配置** 
在 Prometheus 中，告警规则通过 **`alert.rules`** 文件定义，使用 **PromQL** 表达式触发告警。例如： 

```yaml
groups:
- name: example
 rules:
 - alert: HighCPUUsage
  expr: 100 - (avg by(instance) (irate(node_cpu_seconds_total{mode="idle\
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