understanding console output

[ryderb]

I was hoping someone could point me toward where
 I can learn what the error outputs on my console mean?
Eg.   I had this come appear on my console

[fib_algol inet.8 (bsearch4#68) rebuild_fd_flm: switching algo to radix4 lackless opnsense

I've had had similar messages but a different number  appear like "bsearch#xx" and would
be useful if I could know what the different number means or what fib__algol means
Apologies if this has been asked and answered but I could only find questions about
specific outputs rather than how to read it in general .