How to use webhooks for alerts into Telegram?

Good day!

I installed Rancher 2.0 cluster on my own VM’s(on bare metal KVM hypervisor) and can’t find any information how to use Webhook’s for alerting to Telegram ?

Also I asked this question in Slack Chat - but didn’t get answer… so I will be glad to write own scripts + bot for alerting, but I don’t see any webhook api examples