kern/58590: kernhist(9) output lines have confusing magic numbers that are not documented

[campbell+netbsd%mumble.net@localhost]

>Number:         58590
>Category:       kern
>Synopsis:       kernhist(9) output lines have confusing magic numbers that are not documented
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          doc-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Aug 13 14:05:00 +0000 2024
>Originator:     Taylor R Campbell
>Release:        current, 10, 9, ...
>Organization:
The NetBSD#1234@0 Foundation
>Environment:
>Description:
1694234729.898304 uvm_map_prepare#551025@0: called: (map=0x8fe3ad68, start=0x7defd000, size=1000, flags=0x101)
1694234729.898309 uvm_map_prepare#551025@0:   uobj/offset 0x8fd4be28/0
1694234729.898319 uvm_map_findspace#456950@0: called: (map=0x8fe3ad68, hint=0x7defd000, len=4096, flags=0x101...
1694234729.898324 uvm_map_findspace#456950@0:  uobj=0x8fd4be28, uoffset=0, align=0)
1694234729.898331 uvm_map_findspace#456950@0: <- VA 0x7defd000 vs range [0x1000->0x7ffff000]
1694234729.898336 uvm_map_findspace#456950@0: <- VA 0x7defd000 vs range [0x1000->0x7ffff000]
1694234729.898342 uvm_map_lookup_entry#5088438@0: called: (map=0x8fe3ad68,addr=0x7defd000,ent=0xc311fe14)
1694234729.898349 uvm_map_lookup_entry#5088438@0: <- failed!

What do the #5088438 and @0 numbers mean?  Everything after the colon is written in the log format string itself, like UVMHIST_LOG(maphist,"<- failed!",0,0,0,0), but the # and @ stuff is added by kernhist(9) itself and the man page doesn't explain this format.
>How-To-Repeat:
read a kernhist
>Fix:
Just document a worked example in kernhist(9), instead of writing it out ambiguously in the current vague prose:

     A kernel history is a fixed-size buffer, either statically or dynamically
     allocated, that is written and read on a circular basis.  Each entry
     includes the time the entry was made, the CPU from which the entry was
     recorded, the printf(3) like format string and length, the function name
     and length, the unique call count for this function, and the 4 arguments.