groups:
- name: Prometheus alert
  rules:
  # 对任何实例超过30秒无法联系的情况发出警报
  - alert: 服务告警
    expr: up == 0
    for: 30s
    labels:
      severity: critical
    annotations:
      instance: "{{ $labels.instance }}"
      description: "{{ $labels.job }} 服务已关闭"