alert_rules.yml

groups:
- name: Instances
  rules:
  # Alert for any instance that is unreachable for >60 seconds.
  - alert: InstanceDown
    expr: up == 0
    for: 60s
    labels:
      severity: critical
    annotations:
      summary: "Instance {{ $labels.instance }} down"
      description: "{{ $labels.instance }} of job {{ $labels.job }} has been down for more than 60 seconds."