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                            [TOC]
> [參考](https://yunlzheng.gitbook.io/prometheus-book/parti-prometheus-ji-chu/alert/prometheus-alert-rule)



## 配置 
rules/hoststats-alert.rules
```
groups:
- name: hostStatsAlert
  rules:
  - alert: hostCpuUsageAlert
    expr: sum(avg without (cpu)(irate(node_cpu_seconds_total{mode!='idle'}[5m])))  by (instance) > 0.85
    for: 1m
    labels:
      severity: page
    annotations:
      summary: "Instance {{ $labels.instance }} CPU usgae high"
      description: "{{ $labels.instance }} CPU usage above 85% (current value: {{ $value }})"
  - alert: hostMemUsageAlert
    expr:  (node_memory_MemTotal_bytes - node_memory_MemAvailable_bytes)/node_memory_MemTotal_bytes > 0.85
    for: 1m
    labels:
      severity: page
    annotations:
      summary: "Instance {{ $labels.instance }} MEM usgae high"
      description: "{{ $labels.instance }} MEM usage above 85% (current value: {{ $value }})"
```

## 啟動 AlertMannager
```
./alertmanager
```

## 測試
用此命令升高cpu,使其報警
```
cat /dev/zero>/dev/null
```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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