Telegram message template for Alertmanager & how to add it to your receiver in alertmanager.yml

alertmanager.yml

receivers:
- name: 'Default'
  telegram_configs:
  - bot_token: <token>
    api_url: https://api.telegram.org
    chat_id: <chat_id>
    message_thread_id: <message_thread_id> # for supergroups with threads
    parse_mode: 'HTML'
    message: '{{ template "telegram.message". }}' 
    
templates:
- '../message_templates/telegram.tmpl' # path to our telegram.tmpl

telegram.tmpl

{{ define "alert_list" }}{{ range . }}
---
🪪 <b>{{ .Labels.alertname }}</b>
{{- if eq .Labels.severity "critical" }}
🚨 CRITICAL 🚨 {{ end }}
{{- if eq .Labels.severity "warning" }}
⚠️ WARNING ⚠️{{ end }}
{{- if .Annotations.summary }}
📝 {{ .Annotations.summary }}{{ end }}
{{- if .Annotations.description }}
📖 {{ .Annotations.description }}{{ end }}

🏷 Labels:
{{ range .Labels.SortedPairs }}  <i>{{ .Name }}</i>: <code>{{ .Value }}</code>
{{ end }}{{ end }}
🛠 <a href="https://grafana.prod.global:3000">Grafana</a> 💊 <a href="https://alertmanager.prod.global:9093">Alertmanager</a> 💊 <a href="https://">Any other link</a> 🛠
{{ end }}

{{ define "telegram.message" }}
{{ if gt (len .Alerts.Firing) 0 }}
🔥 Alerts Firing 🔥
{{ template "alert_list" .Alerts.Firing }}
{{ end }}
{{ if gt (len .Alerts.Resolved) 0 }}
✅ Alerts Resolved ✅
{{ template "alert_list" .Alerts.Resolved }}
{{ end }}
{{ end }}