I was going to cry foul since 5.18 and 5.19 aren't considered "stable" by most maintainers, but you mentioned that you do kernel dev, so it makes sense. 5.15 is "stable", at least on gentoo.
> I was going to cry foul since 5.18 and 5.19 aren't considered "stable" by most maintainers
Distro maintainers certainly, unless you're Gentoo, Arch, or one of the other mostly-bleeding-edge rolling release distros. The "stable" kernel is whatever the current release is and "longterm" kernels are typically the last major kernel version released in a given year.
Most distributions pick whatever the latest longterm kernel is when they cut releases. Sometimes they don't and things get strange, such as when Canonical chose kernel 4.15 for Ubuntu 18.04, requiring them to maintain an unsupported kernel themselves. IIRC that was because a bunch of AMD CPU and GPU support was added in 4.15.
