Customizing Alertmanager Notifications for Telegram

[basharmadani]

Hi everyone! 👋

I'm setting up custom notifications in Alertmanager for a Telegram receiver, and I want to send different messages when an alert is FIRING and when it is RESOLVED.

The issue I’m facing is that Alertmanager keeps repeating the FIRING message even after the issue is resolved. I want to ensure that only the RESOLVED message is sent when the problem is fixed.

Here’s my current configuration:

global:
  resolve_timeout: 5m

route:
  receiver: telegram_receiver
  group_by: ["alertname", "Host"]
  group_wait: 1s
  group_interval: 1s
  repeat_interval: 24h

  routes:
  - receiver: 'telegram_receiver'
    matchers:
    - severity="Critical"

receivers:
- name: 'telegram_receiver'
  telegram_configs:
  - api_url: 'https://api.telegram.org'
    send_resolved: true
    bot_token: xxxxx
    chat_id: ttttttttttttt
    message: '{{ range .Alerts }}Alert: {{ printf "%s\n" .Labels.alertname }}{{ printf "%s\n" .Annotations.summary }}{{ printf "%s\n" .Annotations.description }}{{ end }}'
    parse_mode: 'HTML'

Does anyone have examples or best practices to share?

[grobinson-grafana]

For examples and best practices, it's better to ask in the Prometheus Users mailing list. GitHub issues are for bug reports and feature requests.

[SckyzO]

Hello, currently, I use an old code to send alerts to Telegram, but it can be improve :

{{ define "telegram.message" }}

{{ if eq .Status "firing" }}🔥 {{ end }}{{ if eq .Status "resolved" }}✅ {{ end }}<b>[{{ .Status | toUpper }}] {{ .CommonLabels.alertname }} on {{ .CommonLabels.instance }}</b>
{{ range .Alerts }}
{{$severity := .Labels.severity -}}
{{if eq $severity "warning" -}}
<b>Severity: </b> {{$severity}} ⚠️
{{else if eq $severity "critical" -}}
<b>Severity: </b> {{$severity}} 🚨
{{else -}}
<b>Severity: </b> {{$severity}} 😱
{{ end -}}
{{$status := .Status -}}
{{ if eq $status "firing" -}}
<b>Date/Time: </b> {{ .StartsAt.Format "Mon 02 Jan 15:04:05 MST 2006" }}
{{else if eq $status "resolved" -}}
<b>Date/Time: </b> {{ .EndsAt.Format "Mon 02 Jan 15:04:05 MST 2006" }}
{{ end -}}
<b>Alert: </b> {{ .Annotations.title }}
<b>Description: </b> {{ .Annotations.description }}
<b>Details: </b>
  {{ range .Labels.SortedPairs }} - {{ .Name | title }}: {{ .Value }}
  {{ end }}
{{ end }}
{{ end }}

Generate alerts like :