[jmclnx]

Curious, since when is directory "/etc/ssh/sshd_config.d/" a thing ?

I checked on my OpenBSD (7.6) System and Slackware (15.0) and that directory does not exist. I checked the man page for sshd and there is no mention of that dir.

Is this a new thing/patch Linux people came up with ?

[dfc]

It might not be an OpenBSD thing. It may be a Debian/ubuntu-ism.

[SoftTalker]

OpenBSD is the author of OpenSSH and yes they support the Include directive in sshd_config but they do not use it in a default install.

[jmclnx]

Just read the manual, nice to see they are not patching ssh for this.

[nubinetwork]

Gentoo started doing this last year and I absolutely hate it.