Ruptime
This gives you the uptime and system load of shell servers.
centos7 up 2+20:10, 0 users, load 0.14, 0.08, 0.03 debian up 2+19:58, 11 users, load 0.14, 0.17, 0.19 fedora up 2+20:11, 0 users, load 0.08, 0.07, 0.09 ftp up 2+20:04, 0 users, load 6.76, 6.94, 7.08 manjaro up 2+20:11, 0 users, load 0.01, 0.04, 0.04 mint up 2+20:04, 0 users, load 0.15, 0.13, 0.09 mxlinux up 1+20:49, 0 users, load 0.18, 0.09, 0.07 scientific7 up 2+20:10, 0 users, load 0.13, 0.11, 0.09 ubuntu up 2+20:09, 7 users, load 0.16, 0.41, 0.51 zorin up 1+20:49, 0 users, load 0.11, 0.08, 0.09