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

SamRay1024

WP-MoniTee allows you to monitor a Teewordls server (one or more). The plugins provides you a widget to add in your sidebar. If your theme supports dynamic sidebar, you can add it in the 
Appearance > Widgets menu. If not, you can use the PHP tag <code><?php wp_monitee(); ?></code> inside a template PHP file.
For each server, the widget show :
<ol>
<li>Name of the server</li>
<li>Current map</li>
<li>Current game type (DM, TDM or CTF)</li>
<li>Number of players in game</li>
<li>Number of players allowed on the server</li>
</ol>
You can configure the widget directly from the widget options or from the dedicated options page.
The available options are :
<ol>
<li>Widget title</li>
<li>Servers list to monitor</li>
<li>Minimum time in secondes between two requests to the Teeworlds server : the server informations are stored in database. For each page served, the plugin checks if the informations are out-of-date. There are considered as is if the difference between the stored time and the current time is greater than the number of seconds you’ll set (15 per default).</li>
</ol>

WP-MoniTee

Provides you a widget which can display informations about your(s) Teeworlds server(s).

Observo Monitoring vs WP-MoniTee