Not much really. The Firewall History report provides system statistics directly related to firewall enforcement such as overall CPU usage, memory consumed, number of concurrent connections, and overall packet rate. The System History report focuses more on resource utilization in the underlying Gaia OS, nonspecific to firewall enforcement. Stats are free disk space, and overall CPU usage further divided into kernel/system space (sy/si/hi as displayed in top) vs. process/user space (us/ni as displayed in top). On an older firewall with User Space Firewall (USFW) disabled, the vast majority of firewall CPU utilization happens in kernel/system space. On newer firewalls with USFW enabled, the vast majority of firewall CPU utilization happens in process/user space.
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