Final answer:
The command 'diagnose webfilter fortiguard statistics list' is used to list FortiGuard web filter statistics on a FortiGate device, which includes various details crucial for monitoring and troubleshooting the FortiGuard service.
Step-by-step explanation:
The command diagnose webfilter fortiguard statistics list serves the purpose of listing FortiGuard web filter statistics. When executed, this command provides a variety of statistics related to the web filtering service of a FortiGate device. These statistics can include details on the number of URLs filtered, the number of filtering errors, service availability, and the number of cached entries. This information is critical for IT administrators when monitoring and troubleshooting the FortiGuard web filtering service. It does not diagnose web filter configuration, initiate FortiGuard web filtering, nor list the service status directly, but rather, it focuses on the statistical data for analysis.