Prometheus: alert:

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groups:
- name: example
  rules:
  - alert: HighRequestLatency
    expr: job:request_latency_seconds:mean5m{job="myjob"} > 0.5
    for: 10m
    labels:
      severity: page
    annotations:
      summary: High request latency



 alert: InstanceDown
 expr: up == 0
 for: 5m
 labels:
   severity: page
 annotations:
   summary: "Instance {{$labels.instance}} down"
   description: "{{$labels.instance}} of job {{$labels.job}} has been down for more than 5 minutes."

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