Telegram is a freeware, cross-platform cloud-based instant messaging, video calling, and VoIP service. It was initially launched for iOS on 14 August 2013 in Russia, and is currently based in Dubai. Official Telegram client apps are available for Android, iOS, Windows, macOS and Linux, as well as for the now-discontinued Windows Phone. There is also an official web interface and numerous unofficial clients. All of Telegram's official apps are open source.
Telegram provides end-to-end encrypted calls and optional end-to-end encrypted "secret" chats between two online users on smartphone clients, whereas cloud chats use client-server/ server-client encryption. Users can send text and voice messages, animated stickers, make voice and video calls, and share an unlimited number of images, documents (2GB per file), user locations, contacts, and music. As of April 2020, Telegram reached 400 million monthly active users.
Checker monitors HAProxy and Nginx services and HAProxy backends. If a backend or HAProxy/Nginx service is down, Checker will send an alert via Telegram and/or Slack, real-time alerting via Roxy-WI and keep incident history.
To create a chatbot on Telegram, you need to contact the BotFather, a special bot used to create other bots.
Enter the command /newbot. BotFather will guide you through all steps necessary for creating a new bot.
After you receive the Token from BotFather you should create a channel. Add the bot to the channel as an administrator.
Add your Token and the name of the channel on the "Checker" tab:
Enable Checker for servers:
Also after enabling checker for servers Roxy-WI starts to collect the incident history. It can be useful for future debugging: