$ mackerel-plugin-uptime
uptime.uptime 84380 1506835431
$ cat /proc/uptime
84379.58 69287.34
$ uptime
14:23:51 up 23:26, 2 users, load average: 0.79, 1.11, 1.21
itchyny (https://github.com/itchyny)
This software is released under the MIT License, see LICENSE.