Notifications
Create notification
Go to Datacenter -> Notification -> Add
Standard backup notification contains logs, which are usually long. This will cause that message is longer as Telegram does allow. Temporary solution is to edit backup message.

POST:
https://api.telegram.org/bot{{secrets.BOT_TOKEN}}/sendMessage?chat_id={{secrets.CHAT_ID}}
HEADER:
Content-type == application/json
BODY:
{
"text": "⚠️Proxmox Notification⚠️
Title: {{ title }}
Message: {{ message }}
Severity: {{ severity }}"
}
Edit matcher


Remove Logs part.
This is unfortunatelly only temporary solution as this directory is rewrited durring reboot.
cd /usr/share/pve-manager/templates/default/
cp vzdump-body.txt.hbs vzdump-body.txt.hbs.bak
nano vzdump-body.txt.hbs
{{error-message}}
Details
=======
{{table guest-table}}
Total running time: {{duration total-time}}
Total size: {{human-bytes total-size}}
Logs
====
{{logs}}