slack api emoji in message code example

Example: slack icon emoji for alertmanager

{{ define "__single_message_title" }}{{ range .Alerts.Firing }}{{ .Labels.alertname }} @ {{ .Annotations.identifier }}{{ end }}{{ range .Alerts.Resolved }}{{ .Labels.alertname }} @ {{ .Annotations.identifier }}{{ end }}{{ end }}{{ define "custom_title" }}[{{ .Status | toUpper }}{{ if eq .Status "firing" }}:{{ .Alerts.Firing | len }}{{ end }}] {{ if or (and (eq (len .Alerts.Firing) 1) (eq (len .Alerts.Resolved) 0)) (and (eq (len .Alerts.Firing) 0) (eq (len .Alerts.Resolved) 1)) }}{{ template "__single_message_title" . }}{{ end }}{{ end }}{{ define "custom_slack_message" }}{{ if or (and (eq (len .Alerts.Firing) 1) (eq (len .Alerts.Resolved) 0)) (and (eq (len .Alerts.Firing) 0) (eq (len .Alerts.Resolved) 1)) }}{{ range .Alerts.Firing }}{{ .Annotations.description }}{{ end }}{{ range .Alerts.Resolved }}{{ .Annotations.description }}{{ end }}{{ else }}{{ if gt (len .Alerts.Firing) 0 }}*Alerts Firing:*{{ range .Alerts.Firing }}- {{ .Annotations.identifier }}: {{ .Annotations.description }}{{ end }}{{ end }}{{ if gt (len .Alerts.Resolved) 0 }}*Alerts Resolved:*{{ range .Alerts.Resolved }}- {{ .Annotations.identifier }}: {{ .Annotations.description }}{{ end }}{{ end }}{{ end }}{{ end }}