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

Arul Prasad J

This is a lightweight WordPress plugin that displays the current running PHP/MySQL version inside “At a Glance” admin dashboard widget.
Plugin uses standard actions and filters only. (No jQuery used)
If you love this plugin, <a href="https://paypal.me/arulprasadj?locale.x=en_GB" rel="nofollow ugc">buy me a cup of coffee</a>

WP PHP Version Display

Displays the current running PHP/MySQL version inside "At a Glance" admin dashboard widget.

Observo Monitoring vs WP PHP Version Display