groups:
  - name: memory
    interval: 15s
    rules:
      - alert: HighMemoryUsage
        expr: 1 - (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes) > 0.8
        for: 2m
        labels:
          severity: warning
          alert_type: memory
        annotations:
          summary: "主机 {{ $labels.hostname }} 内存使用率过高"
          # 修正：移除不支持的函数，只保留百分比显示
          description: "当前内存使用率: {{ $value | humanizePercentage }}（阈值80%）"