# =============================================================================
# WOOO TECH - Momo Pro System
# Prometheus Alert Rules
# Version: 1.0
# =============================================================================
#
# 告警嚴重程度定義:
#   - critical: 需要立即處理的嚴重問題
#   - warning: 需要關注但不緊急的問題
#   - info: 資訊性通知
#
# =============================================================================

groups:
  # ===========================================================================
  # 主機資源監控告警
  # ===========================================================================
  - name: host_alerts
    rules:
      # -----------------------------------------------------------------------
      # CPU 使用率告警
      # -----------------------------------------------------------------------
      - alert: HostHighCpuUsage
        expr: 100 - (avg by(instance) (irate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 50
        for: 5m
        labels:
          severity: warning
          category: cpu
        annotations:
          summary: "主機 CPU 使用率過高"
          description: "主機 {{ $labels.instance }} CPU 使用率超過 50% 持續 5 分鐘，當前值: {{ $value | printf \"%.1f\" }}%"
          value: "{{ $value | printf \"%.1f\" }}%"

      - alert: HostCriticalCpuUsage
        expr: 100 - (avg by(instance) (irate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 80
        for: 5m
        labels:
          severity: critical
          category: cpu
        annotations:
          summary: "主機 CPU 使用率嚴重過高"
          description: "主機 {{ $labels.instance }} CPU 使用率超過 80%，當前值: {{ $value | printf \"%.1f\" }}%"
          value: "{{ $value | printf \"%.1f\" }}%"

      # -----------------------------------------------------------------------
      # 記憶體使用率告警
      # -----------------------------------------------------------------------
      - alert: HostHighMemoryUsage
        expr: (1 - (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes)) * 100 > 50
        for: 5m
        labels:
          severity: warning
          category: memory
        annotations:
          summary: "主機記憶體使用率過高"
          description: "主機 {{ $labels.instance }} 記憶體使用率超過 50% 持續 5 分鐘，當前值: {{ $value | printf \"%.1f\" }}%"
          value: "{{ $value | printf \"%.1f\" }}%"

      - alert: HostCriticalMemoryUsage
        expr: (1 - (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes)) * 100 > 85
        for: 5m
        labels:
          severity: critical
          category: memory
        annotations:
          summary: "主機記憶體使用率嚴重過高"
          description: "主機 {{ $labels.instance }} 記憶體使用率超過 85%，當前值: {{ $value | printf \"%.1f\" }}%"
          value: "{{ $value | printf \"%.1f\" }}%"

      # -----------------------------------------------------------------------
      # 磁碟使用率告警
      # -----------------------------------------------------------------------
      - alert: HostHighDiskUsage
        expr: (1 - (node_filesystem_avail_bytes{fstype!~"tmpfs|overlay"} / node_filesystem_size_bytes{fstype!~"tmpfs|overlay"})) * 100 > 80
        for: 5m
        labels:
          severity: warning
          category: disk
        annotations:
          summary: "主機磁碟使用率過高"
          description: "主機 {{ $labels.instance }} 磁碟 {{ $labels.mountpoint }} 使用率超過 80%，當前值: {{ $value | printf \"%.1f\" }}%"
          value: "{{ $value | printf \"%.1f\" }}%"

      - alert: HostCriticalDiskUsage
        expr: (1 - (node_filesystem_avail_bytes{fstype!~"tmpfs|overlay"} / node_filesystem_size_bytes{fstype!~"tmpfs|overlay"})) * 100 > 90
        for: 5m
        labels:
          severity: critical
          category: disk
        annotations:
          summary: "主機磁碟空間嚴重不足"
          description: "主機 {{ $labels.instance }} 磁碟 {{ $labels.mountpoint }} 使用率超過 90%，當前值: {{ $value | printf \"%.1f\" }}%"
          value: "{{ $value | printf \"%.1f\" }}%"

      # -----------------------------------------------------------------------
      # 系統負載告警
      # -----------------------------------------------------------------------
      - alert: HostHighLoadAverage
        expr: node_load5 / count without(cpu, mode) (node_cpu_seconds_total{mode="idle"}) > 0.8
        for: 5m
        labels:
          severity: warning
          category: load
        annotations:
          summary: "主機系統負載過高"
          description: "主機 {{ $labels.instance }} 5分鐘負載平均值過高，當前值: {{ $value | printf \"%.2f\" }}"
          value: "{{ $value | printf \"%.2f\" }}"

  # ===========================================================================
  # 容器監控告警
  # ===========================================================================
  - name: container_alerts
    rules:
      # -----------------------------------------------------------------------
      # 容器 CPU 使用率
      # -----------------------------------------------------------------------
      - alert: ContainerHighCpuUsage
        expr: (rate(container_cpu_usage_seconds_total{name!=""}[5m]) * 100) > 50
        for: 5m
        labels:
          severity: warning
          category: container_cpu
        annotations:
          summary: "容器 CPU 使用率過高"
          description: "容器 {{ $labels.name }} CPU 使用率超過 50%，當前值: {{ $value | printf \"%.1f\" }}%"
          container: "{{ $labels.name }}"
          value: "{{ $value | printf \"%.1f\" }}%"

      # -----------------------------------------------------------------------
      # 容器記憶體使用率
      # -----------------------------------------------------------------------
      - alert: ContainerHighMemoryUsage
        expr: (container_memory_usage_bytes{name!=""} / container_spec_memory_limit_bytes{name!=""}) * 100 > 50
        for: 5m
        labels:
          severity: warning
          category: container_memory
        annotations:
          summary: "容器記憶體使用率過高"
          description: "容器 {{ $labels.name }} 記憶體使用率超過 50%，當前值: {{ $value | printf \"%.1f\" }}%"
          container: "{{ $labels.name }}"
          value: "{{ $value | printf \"%.1f\" }}%"

  # ===========================================================================
  # 網站健康監控告警
  # ===========================================================================
  - name: website_alerts
    rules:
      # -----------------------------------------------------------------------
      # 網站無法訪問
      # -----------------------------------------------------------------------
      - alert: WebsiteDown
        expr: probe_success{job=~"blackbox-http.*"} == 0
        for: 1m
        labels:
          severity: critical
          category: website
        annotations:
          summary: "網站無法訪問"
          description: "網站 {{ $labels.instance }} 無法訪問，請立即檢查"

      # -----------------------------------------------------------------------
      # 網站響應時間過長
      # -----------------------------------------------------------------------
      - alert: WebsiteSlowResponse
        expr: probe_http_duration_seconds{job=~"blackbox-http.*"} > 5
        for: 2m
        labels:
          severity: warning
          category: website
        annotations:
          summary: "網站響應緩慢"
          description: "網站 {{ $labels.instance }} 響應時間超過 5 秒，當前值: {{ $value | printf \"%.2f\" }} 秒"
          value: "{{ $value | printf \"%.2f\" }}s"

  # ===========================================================================
  # 網路連通性告警
  # ===========================================================================
  - name: network_alerts
    rules:
      # -----------------------------------------------------------------------
      # 主機無法 Ping
      # -----------------------------------------------------------------------
      - alert: HostUnreachable
        expr: probe_success{job="blackbox-icmp"} == 0
        for: 1m
        labels:
          severity: critical
          category: network
        annotations:
          summary: "主機無法連通"
          description: "主機 {{ $labels.instance }} 無法 ping 通，可能已離線"

      # -----------------------------------------------------------------------
      # TCP 端口無法連接
      # -----------------------------------------------------------------------
      - alert: ServicePortDown
        expr: probe_success{job=~"blackbox-tcp.*"} == 0
        for: 1m
        labels:
          severity: critical
          category: network
        annotations:
          summary: "服務端口無法連接"
          description: "服務 {{ $labels.instance }} 無法連接，請檢查服務狀態"

  # ===========================================================================
  # PostgreSQL 資料庫監控告警
  # ===========================================================================
  - name: postgres_alerts
    rules:
      # -----------------------------------------------------------------------
      # PostgreSQL 無法連接
      # -----------------------------------------------------------------------
      - alert: PostgresDown
        expr: pg_up == 0
        for: 1m
        labels:
          severity: critical
          category: database
        annotations:
          summary: "PostgreSQL 無法連接"
          description: "PostgreSQL 資料庫無法連接，請立即檢查"