System Capacity - Network Load
The next graphs on the System Capacity window show the outgoing connections, the bandwidth out, and the proxy buffer memory statistics. You can view the results for a day, week, month, or year. It is important to understand the trends of normal volume and spikes in your environment.
The Proxy Buffer Memory may indicate spikes in network traffic during normal operation, but if the graph climbs steadily to the maximum, the appliance may be reaching its maximum capacity and you should consider adding capacity.
These charts are on the same page as the charts described in System Capacity - System Load, below those charts.