External lights to monitor headless mac?

I'm looking for some way to monitor the disk space and network connection on my headless mac mini.  I use VNC, but it would be nice to have a simple red light/green light on the machine itself so that I could know if things are okay at a glance.  Does anyone know of a programable light that could be setup to monitor the system?  I've looked at these, but I was hoping to find something more straightforward:
blinkm
teensy
Thanks!
Andrew

There are cheap/free services such as pingdom, and various alternatives.

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