Telegram empty custom message sending when message defined

[lorrod]

What did you do?

Be able to define custom message

What did you expect to see?

Message sending without errors

What did you see instead? Under which circumstances?

Received an error:
err="telegram: Bad Request: message text is empty (400)"

Environment

• System information:

docker setup

• Alertmanager version:

image: prom/alertmanager:v0.28.0-rc.0

• Prometheus version:

image: prom/prometheus:v2.51.2

• Alertmanager configuration file:

global:
  resolve_timeout: 5m

route:
  group_by: ['alertname']
  receiver: 'telegram-notifier'
  group_wait: 30s
  group_interval: 5m
  repeat_interval: 3h

receivers:
  - name: 'telegram-notifier'
    telegram_configs:
      - api_url: https://api.telegram.org
        bot_token: $ALERT_NOTIFICATIONS_BOT_TOKEN
        chat_id: $ALERT_NOTIFICATION_CHAT_ID
        message_thread_id: $ALERT_MESSAGE_THREAD_ID
        message: |
          {{ if gt (len .Alerts.Firing) 0 }}
          🚨 Alerts Firing:
          {{ template "__text_alert_list" .Alerts.Firing }}
          {{ end }}
          {{ if gt (len .Alerts.Resolved) 0 }}
          Alerts Resolved:
          {{ template "__text_alert_list" .Alerts.Resolved }}
          {{ end }}
          {{ end }}

• Logs:

ts=2024-11-12T22:47:21.383Z caller=notify.go:867 level=warn component=dispatcher receiver=telegram-notifier integration=telegram[0] aggrGroup="{}:{alertname=\"ContainerAbsent\"}" msg="Notify attempt failed, will retry later" attempts=1 err="telegram: Bad Request: message text is empty (400)"
ts=2024-11-12T22:52:20.408Z caller=dispatch.go:361 level=error component=dispatcher msg="Notify for alerts failed" num_alerts=1 err="telegram-notifier/telegram[0]: notify retry canceled after 16 attempts: telegram: Bad Request: message text is empty (400)"
ts=2024-11-12T22:52:20.418Z caller=notify.go:867 level=warn component=dispatcher receiver=telegram-notifier integration=telegram[0] aggrGroup="{}:{alertname=\"ContainerAbsent\"}" msg="Notify attempt failed, will retry later" attempts=1 err="telegram: Bad Request: message text is empty (400)"

[grobinson-grafana]

You have an invalid template in message (there is an extra closing {{ end }} on the last line).

[Sumitsh28]

Can I work on this issue?