semantic-conventions/docs/resource/os.md

Operating system

In case of virtualized environments, this is the operating system as it is observed by the process, i.e., the virtualized guest rather than the underlying host.

Status:

type: os

Description: The operating system (OS) on which the process represented by this resource is running.

Attribute	Type	Description	Examples	Requirement Level	Stability
os.type	string	The operating system type.	windows; linux; darwin	Required
os.build_id	string	Unique identifier for a particular build or compilation of the operating system. [1]	TQ3C.230805.001.B2; 20E247; 22621	Recommended
os.description	string	Human readable (not intended to be parsed) OS version information, like e.g. reported by ver or lsb_release -a commands.	Microsoft Windows [Version 10.0.18363.778]; Ubuntu 18.04.1 LTS	Recommended
os.name	string	Human readable operating system name.	iOS; Android; Ubuntu	Recommended
os.version	string	The version string of the operating system as defined in Version Attributes.	14.2.1; 18.04.1	Recommended

[1] os.build_id: build_id values SHOULD be obtained from the following sources:

OS	Primary	Fallback
Windows	CurrentBuildNumber from registry HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion	-
MacOS	ProductBuildVersion from /System/Library/CoreServices/SystemVersion.plist	ProductBuildVersion from /System/Library/CoreServices/ServerVersion.plist
Linux	BUILD_ID from /etc/os-release	BUILD_ID from /usr/lib/os-release; contents of /proc/sys/kernel/osrelease

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os.type has the following list of well-known values. If one of them applies, then the respective value MUST be used; otherwise, a custom value MAY be used.

Value	Description	Stability
aix	AIX (Advanced Interactive eXecutive)
darwin	Apple Darwin
dragonflybsd	DragonFly BSD
freebsd	FreeBSD
hpux	HP-UX (Hewlett Packard Unix)
linux	Linux
netbsd	NetBSD
openbsd	OpenBSD
solaris	SunOS, Oracle Solaris
windows	Microsoft Windows
zos	IBM z/OS