Host

Status: Experimental

type: host

Description: A host is defined as a computing instance. For example, physical servers, virtual machines, switches or disk array.

The host.* namespace SHOULD be exclusively used to capture resource attributes. To report host metrics, the system.* namespace SHOULD be used.

Attribute	Type	Description	Examples	Requirement Level	Stability
host.arch	string	The CPU architecture the host system is running on.	amd64	Recommended
host.id	string	Unique host ID. For Cloud, this must be the instance_id assigned by the cloud provider. For non-containerized systems, this should be the machine-id. See the table below for the sources to use to determine the machine-id based on operating system.	fdbf79e8af94cb7f9e8df36789187052	Recommended
host.image.id	string	VM image ID or host OS image ID. For Cloud, this value is from the provider.	ami-07b06b442921831e5	Recommended
host.image.name	string	Name of the VM image or OS install the host was instantiated from.	infra-ami-eks-worker-node-7d4ec78312; CentOS-8-x86_64-1905	Recommended
host.image.version	string	The version string of the VM image or host OS as defined in Version Attributes.	0.1	Recommended
host.name	string	Name of the host. On Unix systems, it may contain what the hostname command returns, or the fully qualified hostname, or another name specified by the user.	opentelemetry-test	Recommended
host.type	string	Type of host. For Cloud, this must be the machine type.	n1-standard-1	Recommended
host.ip	string[]	Available IP addresses of the host, excluding loopback interfaces. [1]	[192.168.1.140, fe80::abc2:4a28:737a:609e]	Opt-In
host.mac	string[]	Available MAC addresses of the host, excluding loopback interfaces. [2]	[AC-DE-48-23-45-67, AC-DE-48-23-45-67-01-9F]	Opt-In

[1]: IPv4 Addresses MUST be specified in dotted-quad notation. IPv6 addresses MUST be specified in the RFC 5952 format.

[2]: MAC Addresses MUST be represented in IEEE RA hexadecimal form: as hyphen-separated octets in uppercase hexadecimal form from most to least significant.

host.arch 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
amd64	AMD64
arm32	ARM32
arm64	ARM64
ia64	Itanium
ppc32	32-bit PowerPC
ppc64	64-bit PowerPC
s390x	IBM z/Architecture
x86	32-bit x86

type: host.cpu

Attribute	Type	Description	Examples	Requirement Level	Stability
host.cpu.cache.l2.size	int	The amount of level 2 memory cache available to the processor (in Bytes).	12288000	Opt-In
host.cpu.family	string	Family or generation of the CPU.	6; PA-RISC 1.1e	Opt-In
host.cpu.model.id	string	Model identifier. It provides more granular information about the CPU, distinguishing it from other CPUs within the same family.	6; 9000/778/B180L	Opt-In
host.cpu.model.name	string	Model designation of the processor.	11th Gen Intel(R) Core(TM) i7-1185G7 @ 3.00GHz	Opt-In
host.cpu.stepping	string	Stepping or core revisions.	1; r1p1	Opt-In
host.cpu.vendor.id	string	Processor manufacturer identifier. A maximum 12-character string. [1]	GenuineIntel	Opt-In

[1]: CPUID command returns the vendor ID string in EBX, EDX and ECX registers. Writing these to memory in this order results in a 12-character string.

Collecting host.id from non-containerized systems

Non-privileged Machine ID Lookup

When collecting host.id for non-containerized systems non-privileged lookups of the machine id are preferred. SDK detector implementations MUST use the sources listed below to obtain the machine id.

Privileged Machine ID Lookup

The host.id can be looked up using privileged sources. For example, Linux systems can use the output of dmidecode -t system, dmidecode -t baseboard, dmidecode -t chassis, or read the corresponding data from the filesystem (e.g. cat /sys/devices/virtual/dmi/id/product_id, cat /sys/devices/virtual/dmi/id/product_uuid, etc), however, SDK resource detector implementations MUST not collect host.id from privileged sources. If privileged lookup of host.id is required, the value should be injected via the OTEL_RESOURCE_ATTRIBUTES environment variable.