# Prometheus 告警规则
# 资金服务平台

groups:
  # ==================== 服务可用性告警 ====================
  - name: service_availability
    rules:
      # 服务宕机告警
      - alert: ServiceDown
        expr: up == 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "服务 {{ $labels.job }} 宕机"
          description: "服务 {{ $labels.instance }} 已经宕机超过 1 分钟"

      # 健康检查失败
      - alert: HealthCheckFailed
        expr: spring_boot_health_status{status="DOWN"} == 1
        for: 30s
        labels:
          severity: warning
        annotations:
          summary: "服务健康检查失败"
          description: "服务 {{ $labels.application }} 健康状态为 DOWN"

  # ==================== JVM 内存告警 ====================
  - name: jvm_memory
    rules:
      # 堆内存使用率过高
      - alert: HeapMemoryUsageHigh
        expr: (jvm_memory_used_bytes{area="heap"} / jvm_memory_max_bytes{area="heap"}) * 100 > 85
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "JVM 堆内存使用率过高"
          description: "服务 {{ $labels.application }} 堆内存使用率 {{ $value | printf \"%.2f\" }}%"

      # 堆内存即将耗尽
      - alert: HeapMemoryCritical
        expr: (jvm_memory_used_bytes{area="heap"} / jvm_memory_max_bytes{area="heap"}) * 100 > 95
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "JVM 堆内存即将耗尽"
          description: "服务 {{ $labels.application }} 堆内存使用率 {{ $value | printf \"%.2f\" }}%，请立即处理"

      # GC 时间过长
      - alert: GCTimeTooHigh
        expr: rate(jvm_gc_pause_seconds_sum[5m]) > 0.5
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "GC 时间过长"
          description: "服务 {{ $labels.application }} GC 时间占比过高，可能影响性能"

  # ==================== HTTP 请求告警 ====================
  - name: http_requests
    rules:
      # 高错误率
      - alert: HighErrorRate
        expr: sum(rate(http_server_requests_seconds_count{status=~"5.."}[5m])) by (application) / sum(rate(http_server_requests_seconds_count[5m])) by (application) > 0.05
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "HTTP 请求错误率过高"
          description: "服务 {{ $labels.application }} 5xx 错误率 {{ $value | printf \"%.2f\" }}%"

      # 响应时间过长
      - alert: HighResponseTime
        expr: histogram_quantile(0.95, sum(rate(http_server_requests_seconds_bucket[5m])) by (le, application)) > 2
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "HTTP 响应时间过长"
          description: "服务 {{ $labels.application }} P95 响应时间 {{ $value | printf \"%.2f\" }} 秒"

  # ==================== 数据库连接池告警 ====================
  - name: database_connections
    rules:
      # HikariCP 连接池使用率过高
      - alert: HikariPoolUsageHigh
        expr: (hikaricp_connections_active / hikaricp_connections_max) * 100 > 80
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "数据库连接池使用率过高"
          description: "服务 {{ $labels.application }} 连接池使用率 {{ $value | printf \"%.2f\" }}%"

      # 连接池等待
      - alert: HikariPoolPending
        expr: hikaricp_connections_pending > 0
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: "数据库连接池存在等待"
          description: "服务 {{ $labels.application }} 有 {{ $value }} 个连接请求在等待"

  # ==================== 系统资源告警 ====================
  - name: system_resources
    rules:
      # CPU 使用率过高
      - alert: HighCPUUsage
        expr: system_cpu_usage * 100 > 80
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "CPU 使用率过高"
          description: "服务 {{ $labels.application }} CPU 使用率 {{ $value | printf \"%.2f\" }}%"

      # 进程打开文件描述符过多
      - alert: HighFileDescriptorUsage
        expr: process_files_open_files / process_files_max_files * 100 > 80
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "文件描述符使用率过高"
          description: "服务 {{ $labels.application }} 文件描述符使用率 {{ $value | printf \"%.2f\" }}%"