What are the main functions of the Cacti tool?

The main function of the Cacti tool is to monitor and graphically display performance metrics of network devices and servers. It can obtain various performance data from devices through the SNMP protocol and display this data graphically, helping administrators understand the operational status of network devices and servers intuitively. Cacti also provides flexible alert functions to send alerts to administrators when device performance reaches preset thresholds. Additionally, Cacti supports user-customizable plugins to extend its functionality as needed.