Bash script that gathers hourly average traffic statistics (outgoing) from multiple servers and sends it to Telegram using bot.
Create bot and copy token (xxxxxxxxx:xxxxxxxxxxxxxxxxxxxxx-xxxxxxxxxxx). Add bot as admin to some designated channel where you participate and where you want to send statistics (or create one). Send test message from your telegram account in that channel. Go to https://api.telegram.org/botxxxxxxxxx:xxxxxxxxxxxxxxxxxxxxx-xxxxxxxxxxx/getUpdates and copy chat id from JSON entry for test message (look into the end of that JSON).
sudo apt update
sudo apt install vnstat openssh-server
sudo apt update
sudo apt install sshpass jq
curl -Lo multi_server_stats.sh https://raw.githubusercontent.com/jgoodies/multi_server_stats/main/multi_server_stats.sh
nano multi_server_stats.sh -- enter telegram bot token and chat id there
chmod +x multi_server_stats.sh
curl -Lo multi_server_stats.ini https://raw.githubusercontent.com/jgoodies/multi_server_stats/main/multi_server_stats.ini
nano multi_server_stats.ini -- add servers; ip and password first; then enter username (if not root); and then ssh port (if not 22); separate logically using empty line; use 127.0.0.1 for current server to be monitored if needed (and don't forget to install vnstat openssh-server there)
sudo nano /etc/crontab -- add line 10 * * * * foouser test -x /home/foouser/multi_server_stats.sh && /home/foouser/multi_server_stats.sh > /dev/null 2>&1 to the end.