groups:
  - name: takeoutsaas-app
    interval: 30s
    rules:
      - alert: HighErrorRate
        expr: |
          sum(rate(http_server_request_duration_seconds_count{http_response_status_code=~"5.."}[5m]))
            / sum(rate(http_server_request_duration_seconds_count[5m])) > 0.05
        for: 5m
        labels:
          severity: critical
        annotations:
          summary: "API 5xx 错误率过高"
          description: "过去 5 分钟 5xx 占比超过 5%，请检查依赖或发布"

      - alert: HighP95Latency
        expr: |
          histogram_quantile(0.95, sum(rate(http_server_request_duration_seconds_bucket[5m])) by (le, service_name))
            > 1
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "API P95 延迟过高"
          description: "过去 5 分钟 P95 超过 1s，请排查热点接口或依赖"

      - alert: InstanceDown
        expr: up{job=~"admin-api|mini-api|user-api"} == 0
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: "实例不可达"
          description: "Prometheus 抓取失败，实例处于 down 状态"