maG66

Install the plugin and check the Status URL Link. You can submit it to observo-monitoring.com to monitor it 24/7. 
– shell_exec must be available for cpu and memory 
– The plugin will install an open rest api 
– External servers can access this api to get performance stats 
– Services like observo-monitoring.com can give you an added value
<h3>Credits</h3>
<a href="https://www.observo-monitoring.com" title="Observo Monitoring" rel="nofollow ugc">Observo Monitoring</a>

Observo Monitoring

Monitor your Server Memory, Disk and CPU from external server

Scott Nelle

Uptime Robot uses the uptimerobot.com API to display log messages relating to a site’s uptime. You must have a free uptimerobot.com account to get any use from this plugin.

Uptime Robot

A dashboard widget for monitoring your uptimerobot.com log messages

Observo Monitoring vs Uptime Robot