Prometheus警报管理器模板更改

Question

I have prometheus alert manager running with a template, and im getting email subject as following

[FIRING:6] Unusual network throughput out (thanos group_b aws_us_b instance_191 infrastructure monitoring-prometheus-node warning)

all the values after the alert name are labels. here is the template subject code

{{ define "__subject" }}[{{ .Status | toUpper }} {{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}]  {{ .GroupLabels.SortedPairs.Values | join " " }}  {{ if gt (len .CommonLabels) (len .GroupLabels) }} ({{ with .CommonLabels.Remove .GroupLabels.Names }}   {{ .Values | join " " }}   {{ end }}) {{ end }}{{ end }}

I would like to modify this only to get following

[FIRING:6] Unusual network throughput out (group_b instance_191) only group name and instance name

how can I achieve this?

Answer 1

You could replace your template with something like this:

{{ define "__subject" }}[{{ .Status | toUpper }} {{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ .GroupLabels.alertname }} ({{ .GroupLabels.group }} {{ .GroupLabels.instance }})

Not sure what will happen if the group or instance labels are not common across all alerts (e.g. if you have an alert firing across multiple groups and/or instances). Maybe you'll just get an empty string, maybe null. According to some brief testing in the Go playground, it would seem you may get <no value>. If you don't want that, you can play around with Go template's {{if }} action.

Something like

{{ if .GroupLabels.group }}{{ .GroupLabels.group }}{{ end }}