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 }}
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