麻烦输出一份prometheus的linux主机告警的rule规则配置文件呢

当然可以，以下是一个简单的prometheus的Linux主机告警规则配置文件示例：

groups:
- name: host
  rules:
  - alert: HighCpuUsage
    expr: (100 - (avg by(instance) (irate(node_cpu{mode="idle"}[5m])) * 100)) > 90
    for: 5m
    labels:
      severity: warning
    annotations:
      summary: "High CPU usage on {{ $labels.instance }}"
      description: "CPU usage on {{ $labels.instance }} has been above 90% for the last 5 minutes."

  - alert: HighMemoryUsage
    expr: (node_memory_MemAvailable / node_memory_MemTotal) * 100 < 10
    for: 5m
    labels:
      severity: warning
    annotations:
      summary: "High memory usage on {{ $labels.instance }}"
      description: "Memory usage on {{ $labels.instance }} has been above 90% for the last 5 minutes."

这个配置文件定义了两个警报规则。第一个规则检查 CPU 使用率是否超过了90％，第二个规则检查可用内存是否低于10％。如果这些条件满足，则会生成一个警报，并在Prometheus中显示警报消息。