How does logread get its data?

As the title states.

How does the busy box logread command get its output? Where does the data come from? Is the data from a single source or multiple sources?

I am using Splunk to filter and sort data from my OpenWRT. I set the Firewall Wan zone settings to log rejected packets at a rate of 10/sec. The logread command showed that there was definetly "REJECT wan in" packets being rejected. Splunk showed that this went on for seven days and then abruptly stopped. Logread output showed the same results. There were no more "REJECT wan in". However when I restarted the OpenWRT that very information was being listed.

FYI
Router Model= Linsys WRT1900ACS
Firmware Version= 19.07.6

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