You need your own telegram bot (@BotFather) and channel to receive messages from your bot
Place this script to your bin directory, edit bot token and chat id and add tthe script to crontab.
Add your domain list (one per line) to ~/domains.txt.

Способов, вероятно, масса, но я приведу два.
С датой в конце:
# ping -i5 ya.ru | while read n; do echo -ne "$n\t"; date +"%d-%m-%Y %H:%M:%S"; done
PING ya.ru (77.88.21.3) 56(84) bytes of data. 10-02-2012 09:09:45
64 bytes from www.yandex.ru (77.88.21.3): icmp_seq=1 ttl=55 time=20.5 ms 10-02-2012 09:09:45
64 bytes from www.yandex.ru (77.88.21.3): icmp_seq=2 ttl=55 time=20.5 ms 10-02-2012 09:09:50
64 bytes from www.yandex.ru (77.88.21.3): icmp_seq=3 ttl=55 time=20.6 ms 10-02-2012 09:09:55

С датой вначале: