How to include separate labels into custom email template for notification

[Владимир organ2]

Hi, folk.

I wanna use custom email template for notification. I've found some template (in attachment). Changed it a little. And now title of email looks like this:

But It's unreadable. I want to create some template which will look like:

[FIRING:1] {{ .labels.custom_host }}:{{ .labels.alertname }}

I want to include only few labels (custom_name and alertname) into email title. How can I do it?

Here's the row from default.tmpl which is intended for creating email title:

{{ 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 }}

[Владимир organ2]

I figured out that this part using for creating [FIRING:1] or [RESOLVED] and it works.

{{ define "__subject" }}[{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ end }}

But I don't now what I should insert inside for getting only one label.

If I insert {{ .labels.alertname }} inside it just broke my email

{{ define "__subject" }}[{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ .labels.alertname }} {{ end }}

[Владимир organ2]

I managed to do it!!!.

If you wanna make your own subject (title) with particular labels you should use {{ .GroupLabels.your_label }} and put it in this row:

{{ define "__subject" }}[{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] __put here___ {{ end }}

Now my notification looks like this: