santerref

This plugin simplifies how you can add for you by giving you a configuration page to put the code.
Once installed, a new REST API route will be created to output the code: wp-json/mywebsiteisonline/v1/verify
Trusted by developers from all around the world.
<h4>My Website is Online features</h4>
Receive a notification as soon as a problem is detected on your website.
<ul>
<li>1-minute checks</li>
<li>Unlimited monitors</li>
<li>SMS alerts</li>
<li>Unlimited email alerts</li>
<li>HTTP headers and status</li>
<li>Response time monitoring (TTFB)</li>
<li>SSL certificate checks</li>
<li>Multi-factor authentication</li>
<li>12 months log retention</li>
<li>Multiple email recipients</li>
<li>Domain expiration monitoring</li>
<li>Google Web Risk</li>
<li>DNS records monitoring</li>
<li>Slack integration</li>
</ul>
To learn more about My Website is Online visit: <a href="https://mywebsiteisonline.com/" rel="nofollow ugc">https://mywebsiteisonline.com/</a>

Uptime Monitoring for WordPress – My Website is Online

Thanks for the plugin, help me linking my website to My Website is Online.

Simple and works perfectly

My Website is Online is a Web service that monitors your website every minute to check if it's down. Don’t let downtimes impact your business.

Daisuke Takahashi

Do you want to monitor your server without using SSH?
Don’t you know how to use difficult commands? (looks like a spell!)
<blockquote>
OK! Leave all to this plugin!
</blockquote>
“Server Status” adds widget like ‘uptime’ command in Dashboard and Network Admin Dashboard.
<h3>Notice</h3>
<ul>
<li>Currently, only RHEL/CentOS is tested. And OS X is tesing now! (The number of tested OS will increase shortly.)</li>
<li>PECL Zend OPcache users, please add server-status.php to black list! Otherwise, there must be segmentation fault. 
This troublesome process isn’t required on PHP5.5!</li>
<li>PHP 5.2 users, your version of PHP is no longer supported.(<a href="http://www.php.net/eol.php" rel="nofollow ugc">Detail</a>) If you’re using such older version, this plugin nags at it!</li>
</ul>

Server Status

thank you a lot for this work, keep it up!

a little too much info, but great for monitoring while dev/stage

Show server information widget in Dashboard and Network Admin Dashboard.(Currently, only RHEL is tested)

Uptime Monitoring for WordPress – My Website is Online vs Server Status