[resource/host] Add semantic convention for IP addresses of a host (#203)

Co-authored-by: Alexander Wert <AlexanderWert@users.noreply.github.com>

CHANGELOG.md

@@ -134,6 +134,8 @@ release.
   ([#178](https://github.com/open-telemetry/semantic-conventions/pull/178))
 - Improve HTTP metric briefs.
   ([#366](https://github.com/open-telemetry/semantic-conventions/pull/366))
+- Add `host.ip` resource attribute convention.
+  ([#203](https://github.com/open-telemetry/semantic-conventions/pull/203))
 
 ## v1.21.0 (2023-07-13)
 

docs/resource/host.md

@@ -17,9 +17,12 @@ To report host metrics, the `system.*` namespace SHOULD be used.
 | `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](README.md#version-attributes). | `0.1` | 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.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 |
 
+**[1]:** IPv4 Addresses MUST be specified in dotted-quad notation. IPv6 addresses MUST be specified in the [RFC 5952](https://www.rfc-editor.org/rfc/rfc5952.html) format.
+
 `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 |

model/resource/host.yaml

@@ -70,6 +70,16 @@ groups:
           The version string of the VM image or host OS as defined in
           [Version Attributes](README.md#version-attributes).
         examples: ['0.1']
+      - id: ip
+        type: string[]
+        requirement_level: opt_in
+        brief: >
+          Available IP addresses of the host, excluding loopback interfaces.
+        note: >
+          IPv4 Addresses MUST be specified in dotted-quad notation. IPv6 addresses
+          MUST be specified in the [RFC 5952](https://www.rfc-editor.org/rfc/rfc5952.html) format.
+        examples: ["192.168.1.140", "fe80::abc2:4a28:737a:609e"]
+
   - id: host.cpu
     prefix: host.cpu
     type: resource