site monitor

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I once wrote a site monitor for a friend and their company. The application repeatedly requests a sequence of resources from one or more web servers over HTTP. The response time is plotted in real-time and logged for later investigation. Communication errors result in audible alarms (optional).

Here's a screenshot:

A detailed description of this application and its usage can be found in the following case study.

• vizzavi - case study
  I originally wrote the site monitoring app for a colleague who works at Vizzavi. However, I own IP over the code, and have since generalised it such that it can be useful for many different sites.