System Monitoring

pfSense provides a wealth of information about the state of the firewall, its services, traffic flowing through the firewall, and log data.

Logs

Logs on pfSense contain recent events and messages from daemons. These messages can be stored locally on a limited basis, or forwarded to a central logging server for long-term storage, better reporting, alerting, and so on.

Traffic Monitoring

These articles cover monitoring traffic on interfaces as well as using additional packages for more detailed monitoring of user throughput/usage.