network-monitor/prometheus/alert.rules

ALERT service_down
  IF up == 0
  ANNOTATIONS {
      summary = "Instance {{ $labels.instance }} is down :( ",
      description = "{{ $labels.instance }} of job {{ $labels.job }} is not happy.",
  }
  
ALERT high_load
  IF node_load1 > 0.5
  ANNOTATIONS {
      summary = "Instance {{ $labels.instance }} under high load",
      description = "{{ $labels.instance }} of job {{ $labels.job }} is under high load.",
  }