Actually I do notice one thing, having just upgraded to:
kern.version=OpenBSD 6.9-current (GENERIC.MP) #492: Sat May  1 17:37:28 MDT 2021

I checked the output from dmesg and I have a new boot time message:
dt: 443 probes

man dt tells me that dt is dynamic tracing and that I can enable it by
setting kern.allowdt.

But when I do (as root): "sysctl kern.allowdt=1" it returns this error:
sysctl: kern.allowdt: Operation not permitted

What am I missing?

Cheers,
Robb.

FYI: This is on an Intel NUC:
bios0 at mainbus0: SMBIOS rev. 3.2 @ 0x7a9a4000 (77 entries)
bios0: vendor Intel Corp. version "BECFL357.86A.0087.2020.1209.1115" date 
12/09/2020
bios0: Intel(R) Client Systems NUC8i5BEH

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