Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 27+17:28, 0 users, load 0.02, 0.11, 0.11 debian up 3+09:49, 3 users, load 0.21, 0.25, 0.21 fedora up 27+18:07, 0 users, load 0.05, 0.07, 0.08 ftp up 5+22:52, 0 users, load 4.42, 5.46, 3.45 mint up 5+22:28, 6 users, load 0.12, 0.07, 0.06 mxlinux up 27+18:05, 0 users, load 0.01, 0.06, 0.07 radius up 18+10:52, 1 user, load 0.04, 0.09, 0.08 scientific7 up 27+17:28, 0 users, load 0.05, 0.14, 0.18 ubuntu up 6+16:55, 9 users, load 0.11, 0.15, 0.54 zorin up 2+23:37, 1 user, load 0.05, 0.10, 0.07