Template examples

https://prometheus.io/docs/prometheus/latest/configuration/template_examples/

Simple alert field templates

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."

Alert field templates will be executed during every rule iteration for each alert that fires, so keep any queries and templates lightweight

Simple iteration

{{ range query "up" }}
  {{ .Labels.instance }} {{ .Value }}
{{ end }}

Display one value

{{ with query "some_metric{instance='someinstance'}" }}
  {{ . | first | value | humanize }}
{{ end }}