[resource/host] Define host.mac semantic convention

docs/resource/host.md

@@ -16,6 +16,9 @@
 | `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.id` | string | VM image ID or host OS image ID. For Cloud, this value is from the provider. | `ami-07b06b442921831e5` | Recommended |
 | `host.image.version` | string | The version string of the VM image or host OS as defined in [Version Attributes](README.md#version-attributes). | `0.1` | Recommended |
+| `host.mac` | string[] | Available MAC addresses of the host, excluding loopback interfaces. [1] | `[ac-de-48-23-45-67, AC-DE-48-23-45-67-01-9F]` | Opt-In |
+
+**[1]:** MAC Addresses MUST be represented in [IEEE RA hexadecimal form](https://standards.ieee.org/wp-content/uploads/import/documents/tutorials/eui.pdf): as hyphen-separated octets in 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.
 

model/resource/host.yaml

@@ -70,6 +70,15 @@ groups:
           The version string of the VM image or host OS as defined in
           [Version Attributes](README.md#version-attributes).
         examples: ['0.1']
+      - id: mac
+        type: string[]
+        requirement_level: opt_in
+        brief: >
+          Available MAC addresses of the host, excluding loopback interfaces.
+        note: >
+          MAC Addresses MUST be represented in [IEEE RA hexadecimal form](https://standards.ieee.org/wp-content/uploads/import/documents/tutorials/eui.pdf):
+          as hyphen-separated octets in hexadecimal form from most to least significant.
+        examples: ['ac-de-48-23-45-67', 'AC-DE-48-23-45-67-01-9F']
   - id: host.cpu
     prefix: host.cpu
     type: resource