I would like to add three new resource-level semantic conventions to the os.* namespace that include information about the kernel used by the system. Roughly, they could be defined as follows:

These would be useful to identify a resource as coming from a machine with a specific kernel version, which can be useful in debugging and troubleshooting systems.

It's been a while since I have contributed to semantic conventions so I have a few open questions, please bear with me :)

Open questions

1. Elastic Common Schema already defines os.kernel as "Operating system kernel version as a raw string." and gives 4.4.0-112-generic as an example value (so, effectively what I called here os.kernel.release). I think we should use the more specific os.kernel.release for this instead, since os.kernel seems more like a namespace to me, and there's several meanings for 'version'. Is that okay?
2. Should os.kernel.name have a pre-defined set of values? If so, what values are in scope?
3. Are the values as described sufficiently cross-platform? At a minimum, do they have a reasonable equivalent on Windows and macOS?
4. Is the proposed description well-specified enough? Are uname output and flags consistent enough to use it as a standard? Based on the description of host.id it sounds like it should be okay, but I am happy to consider a different definition if something is suggested.