The cacti plugin
This plugin allows you to see your graphs generated by cacti in GLPI.
After decompressing the archive into the plugin folder of GLPI, log on as administrator:
Menu: Configuration / Plugins / Cacti / Installation
This will create the tables used by the extension.
Configuring Cacti Databases
In Cacti, you must define the graphics so a GUEST user can view them. Then you can view them from GLPI.
In the cacti web interface, go to: Configuration> Settings> Authentication> General
Set the parameter 'Guest User' to 'guest'.