Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 1+21:58, 0 users, load 0.28, 0.31, 0.28 debian up 1+20:10, 7 users, load 0.45, 0.36, 0.39 fedora up 1+21:59, 0 users, load 0.20, 0.35, 0.49 ftp up 1+20:10, 1 user, load 2.19, 2.10, 1.92 manjaro up 1+21:58, 0 users, load 0.09, 0.07, 0.08 mint up 1+20:10, 0 users, load 0.19, 0.09, 0.06 mxlinux up 1+20:33, 0 users, load 0.16, 0.10, 0.11 scientific7 up 1+21:59, 0 users, load 0.16, 0.25, 0.30 ubuntu up 1+21:56, 10 users, load 0.40, 0.36, 0.76 zorin up 1+20:32, 0 users, load 0.07, 0.26, 0.33