FortiOS Handbook V2, Chapter 4: Logging and Reporting

This document provides detailed information that explains how to begin choosing a log device for your logging requirements, the types of log files, how to configure your chosen log device, including detailed explanations of each log type of log messages. Logging is an integral component of the FortiGate system. Logging allows you to view the activity and status of the traffic passing through your network, and monitor for anomalies.