Prometheus: alert:

• https://prometheus.io/docs/prometheus/latest/configuration/alerting_rules/

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."

Related

• Alertmanager
• expr:
• Go template: https://pkg.go.dev/text/template

See also

• Prometheus Alertmanager: amtool, alertmanager.yml, simple.yml, Karma, versions, Signl4.com, Zenduty
• Prometheus: Prometheus installation, 9090, storage, Prometheus exporters: Node exporter 9100, Blackbox exporter, Prometheus alertmanager (changelog), Prometheus versions, Prometheus Node exporter releases, promtool, amtool, tsdb, /etc/default/prometheus, /etc/prometheus/prometheus.yml, journalctl -u prometheus, /etc/default/prometheus-node-exporter, PromQL, alert:, Prometheus Operator, Thanos, VictoriaMetrics, PushGateway, Prometheus API, values.yml, Amazon Managed Service for Prometheus