Alertmanager telegram template

alertmanager.tmpl

{{ define "__yucca_text_alert_list" }}{{ range . }}
---
🪪 <b>{{ .Labels.alertname }}</b>
{{- 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://yucca.app/">Grafana</a> 💊 <a href="https://yucca.app/">Alertmanager</a> 💊 <a href="https://yucca.app/">Prometheus</a> 🛠
{{ end }}

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

Finally, found template that works.

Here is the template for "firing" and "resolved" alerts

`cat ../alertmanager/templates/telegram.tmpl
{{ define "telegram.default.message" }}
{{ if eq .Status "firing" }}
{{ if eq .CommonLabels.severity "critical" }}🔴 Alert: {{ .CommonLabels.alertname }}
{{ else if eq .CommonLabels.severity "warning" }}🟠 Alert: {{ .CommonLabels.alertname }}
{{ else }}⚪️ Alert: {{ .CommonLabels.alertname }}
{{ end }}
Status: 🔥 FIRING
Severity: {{ if eq .CommonLabels.severity "critical" }}🔴 {{ .CommonLabels.severity | title }}{{ else if eq .CommonLabels.severity "warning" }}🟠 {{ .CommonLabels.severity | title }}{{ else }}⚪️ {{ .CommonLabels.severity | title }}{{ end }}
{{ else if eq .Status "resolved" }}
{{ if eq .CommonLabels.severity "critical" }}🟢 🚌 TRANSPORT Alert: {{ .CommonLabels.alertname }}
{{ else if eq .CommonLabels.severity "warning" }}🟢 🚌 TRANSPORT Alert: {{ .CommonLabels.alertname }}
{{ else }}⚪️ Alert: {{ .CommonLabels.alertname }}
{{ end }}
Status: ✅ RESOLVED
Severity: {{ if eq .CommonLabels.severity "critical" }}🟢 {{ .CommonLabels.severity | title }}{{ else if eq .CommonLabels.severity "warning" }}🟢 {{ .CommonLabels.severity | title }}{{ else }}⚪️ {{ .CommonLabels.severity | title }}{{ end }}
{{ end }}
{{ range .Alerts }}
Instance: {{ .Labels.instance }}

• Title: {{ .Annotations.title }}
• Description: {{ .Annotations.description }}
  {{ end }}
  {{ end }}`

Example notification:
Firing
🟠 Alert: HighMemoryUsage>90%

Status: 🔥 FIRING
Severity: 🟠 Warning

Instance: server-1:9100

• Title: WARNING High Memory Usage on server-1:9100
• Description: Memory usage on the instance is 53.67%

Resolved
🟢 Alert: HighMemoryUsage>90%

Status: ✅ RESOLVED
Severity: 🟢 Warning

Instance: server-1:9100

• Title: WARNING High Memory Usage on server-1:9100
• Description: Memory usage on the instance is 64.59%