Pingmeter

You might have a great website, shop or blog. so do your competitor. And they get your visitors when your site is down. It is stressful to have your website down and you get aware of it few hours after your visitors. Be the first one to notice.
Pingmeter ping your website constantly to ensure your website is working fine and take note of ping response speed. If your website timeout or go down, Pingmeter will double check it with our other servers across america, europe, russia and even australia, then notify you via SMS, email or even voice call on your phone.
Monitors can be associated with your website, so Pingmeter keep track of number of online visitors on your websites. and If a monitor go down, it notify you in call about number of your online visitors and record how many online visitors were on your website when this downtime happened.
Pingmeter monitor can scan HTTP, HTTPS, SSL Certificate validation, FTP, SMTP, POP3, IMAP, ICMP, MySQL and custom port pings. Monitors can be parents of a previous monitor, so for example you do not receive multiple alerts if your server go down and bring down HTTP, MySQL and FTP along with it.
Additionally, it can trigger pre-defined rescue actions to automatically recover your website such as modifying your CloudFlare DNS to your backup server or restarting your MySQL, Apache or other services by sending SSH command to your server.
Pingmeter give you a public (or private password protected) status page which you can link on your website so that your visitors can check your service status.
<h4>Read More:</h4>
http://www.pingmeter.com/

Pingmeter Uptime Monitoring

Pingmeter monitors and auto rescues your website during downtimes, so you can relax and focus on what's important. You can configure it to receiv …

ryokurosu

This plugin is to fast index , and optimize ping function. For your website, speed index is very useful way to notify subscribers and users.
This plugin has also ping optimizer. Ping send only publish. 
So tell the world your website is not spam.
This plugin:
<ul>
<li>Sends fast speed notifications when you update your blog</li>
<li>Supports multi-user installations (WordPress MU)</li>
<li>Supports multiple hubs</li>
<li>Supports all of the feed formats used by WordPress, not just ATOM and RSS2</li>
<li>Supports latest specs
<ul>
<li>PubSubHubbub <a href="https://pubsubhubbub.github.io/PubSubHubbub/pubsubhubbub-core-0.4.html" rel="nofollow ugc">Version 0.4</a></li>
<li>WebSub <a href="https://www.w3.org/TR/websub/" rel="nofollow ugc">W3C Version</a></li>
</ul>
</li>
<li>Announces which hubs you are using by adding <code><link rel="hub" ...></code> declarations to your template header and Atom feed</li>
</ul>
This plugin will ping the following hubs:
<ul>
<li><a href="https://pubsubhubbub.appspot.com" title="Demo hub on Google App Engine" rel="nofollow ugc">Demo hub on Google App Engine</a></li>
<li><a href="https://pubsubhubbub.superfeedr.com" title="SuperFeedr" rel="nofollow ugc">SuperFeedr</a></li>
</ul>
Please contact me if you operate a hub that you would like to be included as a default option.

Fast Speed Index

this is a better way to fast index for your website.

Pingmeter Uptime Monitoring vs Fast Speed Index