diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 0c016ce011..f541bc6faa 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -41,4 +41,8 @@
 /docs/resource/host.md    @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-system-approvers
 /model/resource/host.yaml @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-system-approvers
 
+# Mobile semantic conventions approvers
+/docs/mobile/        @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-mobile-approvers
+/model/logs/mobile*  @open-telemetry/specs-semconv-approvers @open-telemetry/semconv-mobile-approvers
+
 # TODO - Add semconv area experts
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fbd2441d96..6f2af5c77d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -134,6 +134,11 @@ release.
   ([#178](https://github.com/open-telemetry/semantic-conventions/pull/178))
 - Add `system.cpu.frequency` metric.
   ([#337](https://github.com/open-telemetry/semantic-conventions/pull/337))
+- 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))
+>>>>>>> upstream/main
 
 ## v1.21.0 (2023-07-13)
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3bfe45c930..782fb79ca9 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -157,6 +157,23 @@ To quickly fix typos, use
 make misspell-correction
 ```
 
+### How to get your PR merged
+
+A PR (pull request) is considered to be **ready to merge** when:
+
+* It has received at least two approvals from the [code
+  owners](./.github/CODEOWNERS) (if approvals are from only one company, they
+  won't count).
+* There is no `request changes` from the [code owners](./.github/CODEOWNERS).
+* It has been at least two working days since the last modification (except for
+  the trivial updates, such like typo, cosmetic, rebase, etc.). This gives
+  people reasonable time to review.
+* Trivial changes (typos, cosmetic changes, CI improvements, etc.) don't have to
+  wait for two days.
+
+Any [maintainer](./README.md#contributing) can merge the PR once it is **ready
+to merge**.
+
 ## Updating the referenced specification version
 
 1. Open the `./internal/tools/update_specification_version.sh` script.
diff --git a/docs/http/http-metrics.md b/docs/http/http-metrics.md
index c406fa9e9e..e90b3d9249 100644
--- a/docs/http/http-metrics.md
+++ b/docs/http/http-metrics.md
@@ -70,7 +70,7 @@ of `[ 0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1, 2.5, 5, 7.5, 10
 <!-- semconv metric.http.server.request.duration(metric_table) -->
 | Name     | Instrument Type | Unit (UCUM) | Description    |
 | -------- | --------------- | ----------- | -------------- |
-| `http.server.request.duration` | Histogram | `s` | Measures the duration of inbound HTTP requests. |
+| `http.server.request.duration` | Histogram | `s` | Duration of HTTP server requests. |
 <!-- endsemconv -->
 
 <!-- semconv metric.http.server.request.duration(full) -->
@@ -172,7 +172,7 @@ This metric is optional.
 <!-- semconv metric.http.server.active_requests(metric_table) -->
 | Name     | Instrument Type | Unit (UCUM) | Description    |
 | -------- | --------------- | ----------- | -------------- |
-| `http.server.active_requests` | UpDownCounter | `{request}` | Measures the number of concurrent HTTP requests that are currently in-flight. |
+| `http.server.active_requests` | UpDownCounter | `{request}` | Number of active HTTP server requests. |
 <!-- endsemconv -->
 
 <!-- semconv metric.http.server.active_requests(full) -->
@@ -240,7 +240,7 @@ This metric is optional.
 <!-- semconv metric.http.server.request.body.size(metric_table) -->
 | Name     | Instrument Type | Unit (UCUM) | Description    |
 | -------- | --------------- | ----------- | -------------- |
-| `http.server.request.body.size` | Histogram | `By` | Measures the size of HTTP request messages. [1] |
+| `http.server.request.body.size` | Histogram | `By` | Size of HTTP server request bodies. [1] |
 
 **[1]:** The size of the request payload body in bytes. This is the number of bytes transferred excluding headers and is often, but not always, present as the [Content-Length](https://www.rfc-editor.org/rfc/rfc9110.html#field.content-length) header. For requests using transport encoding, this should be the compressed size.
 <!-- endsemconv -->
@@ -344,7 +344,7 @@ This metric is optional.
 <!-- semconv metric.http.server.response.body.size(metric_table) -->
 | Name     | Instrument Type | Unit (UCUM) | Description    |
 | -------- | --------------- | ----------- | -------------- |
-| `http.server.response.body.size` | Histogram | `By` | Measures the size of HTTP response messages. [1] |
+| `http.server.response.body.size` | Histogram | `By` | Size of HTTP server response bodies. [1] |
 
 **[1]:** The size of the response payload body in bytes. This is the number of bytes transferred excluding headers and is often, but not always, present as the [Content-Length](https://www.rfc-editor.org/rfc/rfc9110.html#field.content-length) header. For requests using transport encoding, this should be the compressed size.
 <!-- endsemconv -->
@@ -456,7 +456,7 @@ of `[ 0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1, 2.5, 5, 7.5, 10
 <!-- semconv metric.http.client.request.duration(metric_table) -->
 | Name     | Instrument Type | Unit (UCUM) | Description    |
 | -------- | --------------- | ----------- | -------------- |
-| `http.client.request.duration` | Histogram | `s` | Measures the duration of outbound HTTP requests. |
+| `http.client.request.duration` | Histogram | `s` | Duration of HTTP client requests. |
 <!-- endsemconv -->
 
 <!-- semconv metric.http.client.request.duration(full) -->
@@ -549,7 +549,7 @@ This metric is optional.
 <!-- semconv metric.http.client.request.body.size(metric_table) -->
 | Name     | Instrument Type | Unit (UCUM) | Description    |
 | -------- | --------------- | ----------- | -------------- |
-| `http.client.request.body.size` | Histogram | `By` | Measures the size of HTTP request messages. [1] |
+| `http.client.request.body.size` | Histogram | `By` | Size of HTTP client request bodies. [1] |
 
 **[1]:** The size of the request payload body in bytes. This is the number of bytes transferred excluding headers and is often, but not always, present as the [Content-Length](https://www.rfc-editor.org/rfc/rfc9110.html#field.content-length) header. For requests using transport encoding, this should be the compressed size.
 <!-- endsemconv -->
@@ -644,7 +644,7 @@ This metric is optional.
 <!-- semconv metric.http.client.response.body.size(metric_table) -->
 | Name     | Instrument Type | Unit (UCUM) | Description    |
 | -------- | --------------- | ----------- | -------------- |
-| `http.client.response.body.size` | Histogram | `By` | Measures the size of HTTP response messages. [1] |
+| `http.client.response.body.size` | Histogram | `By` | Size of HTTP client response bodies. [1] |
 
 **[1]:** The size of the response payload body in bytes. This is the number of bytes transferred excluding headers and is often, but not always, present as the [Content-Length](https://www.rfc-editor.org/rfc/rfc9110.html#field.content-length) header. For requests using transport encoding, this should be the compressed size.
 <!-- endsemconv -->
diff --git a/docs/resource/host.md b/docs/resource/host.md
index f216a78c92..77c7a707af 100644
--- a/docs/resource/host.md
+++ b/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 |
diff --git a/model/metrics/http.yaml b/model/metrics/http.yaml
index 8e6f350929..89c54cb2c6 100644
--- a/model/metrics/http.yaml
+++ b/model/metrics/http.yaml
@@ -92,7 +92,7 @@ groups:
   - id: metric.http.server.request.duration
     type: metric
     metric_name: http.server.request.duration
-    brief: "Measures the duration of inbound HTTP requests."
+    brief: "Duration of HTTP server requests."
     instrument: histogram
     unit: "s"
     extends: metric_attributes.http.server
@@ -100,7 +100,7 @@ groups:
   - id: metric.http.server.active_requests
     type: metric
     metric_name: http.server.active_requests
-    brief: "Measures the number of concurrent HTTP requests that are currently in-flight."
+    brief: "Number of active HTTP server requests."
     instrument: updowncounter
     unit: "{request}"
     attributes:
@@ -138,7 +138,7 @@ groups:
   - id: metric.http.server.request.body.size
     type: metric
     metric_name: http.server.request.body.size
-    brief: "Measures the size of HTTP request messages."
+    brief: "Size of HTTP server request bodies."
     instrument: histogram
     unit: "By"
     note: >
@@ -150,7 +150,7 @@ groups:
   - id: metric.http.server.response.body.size
     type: metric
     metric_name: http.server.response.body.size
-    brief: "Measures the size of HTTP response messages."
+    brief: "Size of HTTP server response bodies."
     instrument: histogram
     unit: "By"
     note: >
@@ -162,7 +162,7 @@ groups:
   - id: metric.http.client.request.duration
     type: metric
     metric_name: http.client.request.duration
-    brief: "Measures the duration of outbound HTTP requests."
+    brief: "Duration of HTTP client requests."
     instrument: histogram
     unit: "s"
     extends: metric_attributes.http.client
@@ -170,7 +170,7 @@ groups:
   - id: metric.http.client.request.body.size
     type: metric
     metric_name: http.client.request.body.size
-    brief: "Measures the size of HTTP request messages."
+    brief: "Size of HTTP client request bodies."
     instrument: histogram
     unit: "By"
     note: >
@@ -182,7 +182,7 @@ groups:
   - id: metric.http.client.response.body.size
     type: metric
     metric_name: http.client.response.body.size
-    brief: "Measures the size of HTTP response messages."
+    brief: "Size of HTTP client response bodies."
     instrument: histogram
     unit: "By"
     note: >
diff --git a/model/resource/host.yaml b/model/resource/host.yaml
index 2839d8f660..141ccd76bf 100644
--- a/model/resource/host.yaml
+++ b/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