groups:
  - name: host
    rules:
      - alert: TargetDown
        expr: up == 0
        for: 2m
        labels: {severity: critical}
        annotations:
          summary: "Таргет {{ $labels.job }} на {{ $labels.instance }} недоступен"

      - alert: HostHighCPU
        expr: 100 - (avg by(instance) (rate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 90
        for: 10m
        labels: {severity: warning}
        annotations:
          summary: "Высокий CPU на {{ $labels.instance }}: {{ printf \"%.0f\" $value }}%"

      - alert: HostLowMemory
        expr: node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes * 100 < 10
        for: 5m
        labels: {severity: warning}
        annotations:
          summary: "Мало памяти на {{ $labels.instance }}: доступно {{ printf \"%.0f\" $value }}%"

      - alert: HostDiskLow
        expr: node_filesystem_avail_bytes{fstype!~"tmpfs|overlay|squashfs"} / node_filesystem_size_bytes{fstype!~"tmpfs|overlay|squashfs"} * 100 < 15
        for: 5m
        labels: {severity: warning}
        annotations:
          summary: "Кончается диск на {{ $labels.instance }} ({{ $labels.mountpoint }}): свободно {{ printf \"%.0f\" $value }}%"

      - alert: HostDiskCritical
        expr: node_filesystem_avail_bytes{fstype!~"tmpfs|overlay|squashfs"} / node_filesystem_size_bytes{fstype!~"tmpfs|overlay|squashfs"} * 100 < 5
        for: 5m
        labels: {severity: critical}
        annotations:
          summary: "КРИТИЧНО: диск почти полон на {{ $labels.instance }} ({{ $labels.mountpoint }}): свободно {{ printf \"%.0f\" $value }}%"