Kyght

Tracks the distribution of your installable products. The plugin provides an ajax API to accept installation registrations & usage data. Also provides a mechanism for pushing product upgrades to clients. Custom build tags can also be used to track clients with customized products and push custom upgrades to these clients.
Plugin REST API 
 http://www.yoursite.com/wp-admin/admin-ajax.php
<pre><code>Actions:
 regupdate - Adds\Updates a registration record
 useapp - Updates product\version usage and registered client use
 upgrade - Checks for a product upgrade with a higher version number

Note: Product and Registration records are automatically added\updated via inbound API calls. Only Upgrades are added via the Admin console.

Example (.Net API call to register a client)

 **Registration**
 var response = HttpHelper.Post(URL, new NameValueCollection() {
 { "action", "regupdate" }, 
 { "sky", SecretKey }, //Secret ID must match ID in your WordPress|Settings|InstallTracker 
 { "product", Product },
 { "ver", Version },
 { "custom", Custom },

 { "trackid", RegID }, //TrackID from previous registration to allow updates, blank for new
 { "key", key }, //GUID generated by your installation (Format: 00000000-0000-0000-0000-000000000000 )
 { "name", name },
 { "email", email },
 { "phone", phone },
 { "contact", contact },
 { "addr", address },
 { "city", city },
 { "state", state },
 { "zipcode", zipcode}
 }); 

 var str = System.Text.Encoding.Default.GetString(response);
 if (str != null && str.Equals("0")) return false; //Secret key might not match
 var outObject = JsonConvert.DeserializeObject<Registration>(str);
 if (outObject.valid == "TRUE")
 {
 RegID = outObject.regID; //Returned Registration ID for future updates
 return true;
 } 

 **Usage**
 var pars = new NameValueCollection() {
 { "action", "useapp" }, 
 { "sky", SecretKey }, 
 { "product", Product },
 { "ver", Version },
 { "custom", Custom },

 { "trackid", RegID }, //TrackID from previous registration (optional)
 { "key", key } //GUID generated by your installation (optional)
 };


 **Upgrade**
 var pars = new NameValueCollection() {
 { "action", "upgrade" }, 
 { "sky", SecretKey }, 
 { "product", Product },
 { "ver", Version },
 { "custom", Custom },
 };
</code></pre>
.Net API wrapper client library is available at www.kyght.com (http://www.kyght.com/?page_id=147). 
Other client libraries will be available later on GitHub (https://github.com/kyght/InstallTracker).
.Net client dll Usage
installTrack = new Tracker(\”http://www.yoursite.com/wp-admin/admin-ajax.php\”, \”YourProduct\”, \”2.1.16.80\”, \”666745\”);
<ul>
<li>installTrack.Register(String key, String name, String email, String contact, String phone, String address, String city, String state, String zipcode)</li>
<li>installTrack.Usage(String key, OnTrackerComplete onComplete )</li>
<li>installTrack.UpgradeAvailable(OnUpgradeAvailable onUpgrade)</li>
<li>installTrack.Download(String fileurl, String filename, System.ComponentModel.AsyncCompletedEventHandler onComplete, DownloadProgressChangedEventHandler onProgress)</li>
</ul>

Install Tracker

Tracks the distribution of your installable product. Usage statistics, Registrations and Upgrades.

Dion

UsageDD allows administrators to monitor the resource usage of their WordPress installation. It will add a small box at the bottom center of each page, only visible to administrators, that displays the number of MySQL queries, the amount of memory used by the page’s code, and if you are using a compatible webserver (most are compatible), the “time to first byte” (TTFB) and the time required to generate the full page. TTFB is used by Google for page-ranking purposes, and it will be the first of the two displayed.
You can use the display to determine if your site has too many plugins loaded, if your theme is too “heavy”, or if something is wrong on your server. The plugin itself uses virtually no resources and should be compatible with every theme and plugin that outputs HTML.
Support is available in our <a href="https://forum.dion-designs.com/f35/usagedd-support/" rel="nofollow ugc">dedicated support area</a>. Support questions posted on wordpress.org may go unanswered for an extended period of time.

UsageDD

UsageDD allows administrators to monitor the resource usage of their WordPress installation.

Install Tracker vs UsageDD