NerdKey

Powered by NerdTools.co.uk Uptime Tracker (http://uptime.nerdtools.co.uk/) this plugin will add a widget to your sidebar that will show the percentage of availability or uptime for any website over the last 30 days.
In terms of the tracking system, checks are carried out every 5 minutes from different locations and then averages are worked out to form the overall reports from which the graph is generated and shown via an iframe.
Other reports including hourly, weekly and daily can be seen by visiting the Uptime Tracker website directly.
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Uptime Widget

Adds a simple uptime gauge to your WordPress sidebar, showing the percentage of availability for any website over the past 30 days.

WP Enforcer

Keep an eye on the most important aspects of your WordPress site from one central location. Our plugin automatically sends activity that interacts with your database for things like posts, comments, authentication, and more to the cloud in realtime. This gives you peace of mind that you know what bots, spam, or other illegitimate traffic is interacting with your site.
Enable WP Enforcer to analyze your site for suspicious traffic patterns. With our vast database of IP addresses we can determine if the threat is coming from unwanted proxies, TOR network, nefarious web crawlers, or generally considered a threat to the community.
Check to see the current uptime percentage and response time of your site with 1 minute health checks. Get alerted when your site is down!
Take back control of where your traffic comes from. When using WP Enforcer you can decide to block certain traffic signatures and send them to our “safe zone”. That has been proven to help eliminate spam and malicious traffic.
Many agencies and successful WordPress users will run multiple sites. With our innovative cloud based platform we allow you to add our plugin to monitor more than one site and interact with it all from one dashboard for convenience.

Audit the activity of your site and get uptime statistics all from a central platform.

Uptime Widget vs WP Enforcer