If you have adopted the NetMonitor agent for monitoring ping time and have upgraded to Foglight 5.5.8 or higher, check out the custom dashboard cartridge for NetMonitor: Custom Dashboards for Device Availability metrics captured by the NetMonitor agent
Hopefully you'll find these views useful for visualizing device availability in your environment.
Please feel free to mark this thread 'Answered' if your original question has been resolved to your satisfaction.
You are correct, the link is broken and I will check if it can be fixed. The current dashboards + scripts you will find here:
The dashboard Brian created is already 6 years old and written for FMS 5.5.8. Maybe on of our PSO guys still have it.
But be aware, that it might not work anymore for a higher FMS version than 5.5.8.