groups:
- name: filestat
  rules:
  - alert: RebootRequired
    expr: file_glob_match_number{pattern="/var/run/reboot-required"} > 0
    for: 24h
    labels:
      severity: warning
    annotations:
      summary: "Instance {{ $labels.instance }} requires rebooting."
      description: "{{ $labels.instance }} requires rebooting."