Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 60+12:10, 1 user, load 0.38, 1.70, 1.77 debian up 44+07:26, 5 users, load 0.24, 0.19, 0.13 fedora up 60+16:41, 0 users, load 0.18, 0.14, 0.10 ftp up 15+10:55, 0 users, load 2.83, 2.99, 2.75 manjaro up 3:16, 0 users, load 0.00, 0.00, 0.00 mint up 54+23:28, 0 users, load 0.14, 0.09, 0.07 mxlinux up 60+16:39, 0 users, load 0.06, 0.07, 0.08 radius up 60+16:39, 2 users, load 0.08, 0.08, 0.08 scientific7 up 57+11:43, 2 users, load 2.86, 3.62, 4.21 ubuntu up 11+22:49, 5 users, load 0.25, 2.05, 2.30 zorin up 60+11:33, 8 users, load 0.14, 0.11, 0.07