For monitoring and Creating graph for your servers and routers, you should use MRTG (Multi Router Traffic Grapher) . MRTG Made by Perl Technology under GPL License and FOSS. MRTG for executing use SNMP Network Devices . Of course MRTG Graphs is not online and have a delay for showing result analysis. MRTG can create HTML files to show graphs and you can use it for sharing between lots of users .

Demo

For install MRTG just required run SNMP Service (if installed) And that’s enought download compatible version for your OS.

Note: Don’t required use of Apache / MySQL / PHP , But if you want share result on http you can install Apache .

MRTG Website