Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 36+22:34, 2 users, load 0.11, 0.06, 0.02 debian up 20+17:50, 6 users, load 2.26, 2.18, 2.18 fedora up 37+03:02, 0 users, load 0.38, 0.27, 0.18 ftp up 13+18:34, 0 users, load 0.60, 0.79, 1.89 mint up 31+09:52, 0 users, load 0.12, 0.12, 0.09 mxlinux up 37+03:03, 0 users, load 0.13, 0.08, 0.08 radius up 37+03:03, 2 users, load 0.19, 0.11, 0.09 scientific7 up 33+22:04, 2 users, load 2.13, 2.36, 2.42 ubuntu up 7+08:55, 6 users, load 0.36, 0.27, 0.18 zorin up 36+21:57, 8 users, load 0.04, 0.09, 0.08