Howtoforge published a tutorial about installing Cacti Network Monitoring Tool on Debian 11.
How to Install Cacti Network Monitoring Tool on Debian 11
Cacti is an open-source, web-based network monitoring tool written in PHP. Cacti is the front end of industry-standard RRDtool. Cacti generates CPU load and network bandwidth utilization graphs using SNMP (Simple Network Management Protocol). It is specially designed for monitoring network devices like switches, routers, and servers. Cacti stores all necessary data in the MySQL database to generate various graphs.