Remove mention of net.transport from http semantic conventions (#3244)

Based on @lmolkova's
#3215 (comment)

## Changes

Removes mention of `net.transport` from http semantic conventions.

---------

Co-authored-by: Reiley Yang <reyang@microsoft.com>

CHANGELOG.md

@@ -41,6 +41,8 @@ release.
   ([#3250](https://github.com/open-telemetry/opentelemetry-specification/pull/3250))
 - Mark the attribute naming guidelines in the specification as stable.
   ([#3220](https://github.com/open-telemetry/opentelemetry-specification/pull/3220))
+- Remove mention of `net.transport` from HTTP semantic conventions
+  ([#3244](https://github.com/open-telemetry/opentelemetry-specification/pull/3244))
 
 ### Compatibility
 

semantic_conventions/http-common.yaml

@@ -40,9 +40,6 @@ groups:
               value: 'QUIC'
               brief: 'QUIC protocol.'
         brief: 'Kind of HTTP protocol used.'
-        note: >
-          If `net.transport` is not specified, it can be assumed to be `IP.TCP` except if `http.flavor`
-          is `QUIC`, in which case `IP.UDP` is assumed.
 
   - id: attributes.http.client
     prefix: http

specification/metrics/semantic_conventions/http-metrics.md

@@ -29,18 +29,16 @@ This metric is required.
 |---|---|---|---|---|
 | `http.scheme` | string | The URI scheme identifying the used protocol. | `http`; `https` | Required |
 | `http.route` | string | The matched route (path template in the format used by the respective server framework). See note below [1] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
-| `http.flavor` | string | Kind of HTTP protocol used. [2] | `1.0` | Recommended |
+| `http.flavor` | string | Kind of HTTP protocol used. | `1.0` | Recommended |
 | `http.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
 | `http.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
-| [`net.host.name`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [3] | `localhost` | Required |
-| [`net.host.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [4] | `8080` | Conditionally Required: [5] |
+| [`net.host.name`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [2] | `localhost` | Required |
+| [`net.host.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [3] | `8080` | Conditionally Required: [4] |
 
 **[1]:** MUST NOT be populated when this is not supported by the HTTP server framework as the route attribute should have low-cardinality and the URI path can NOT substitute it.
 SHOULD include the [application root](/specification/trace/semantic_conventions/http.md#http-server-definitions) if there is one.
 
-**[2]:** If `net.transport` is not specified, it can be assumed to be `IP.TCP` except if `http.flavor` is `QUIC`, in which case `IP.UDP` is assumed.
-
-**[3]:** Determined by using the first of the following that applies
+**[2]:** Determined by using the first of the following that applies
 
 - The [primary server name](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host. MUST only
   include host identifier.
@@ -50,14 +48,14 @@ SHOULD include the [application root](/specification/trace/semantic_conventions/
 
 SHOULD NOT be set if only IP address is available and capturing name would require a reverse DNS lookup.
 
-**[4]:** Determined by using the first of the following that applies
+**[3]:** Determined by using the first of the following that applies
 
 - Port identifier of the [primary server host](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host.
 - Port identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form.
 - Port identifier of the `Host` header
 
-**[5]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[4]:** If not default (`80` for `http` scheme, `443` for `https`).
 
 `http.flavor` 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.
 
@@ -125,18 +123,16 @@ This metric is optional.
 |---|---|---|---|---|
 | `http.scheme` | string | The URI scheme identifying the used protocol. | `http`; `https` | Required |
 | `http.route` | string | The matched route (path template in the format used by the respective server framework). See note below [1] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
-| `http.flavor` | string | Kind of HTTP protocol used. [2] | `1.0` | Recommended |
+| `http.flavor` | string | Kind of HTTP protocol used. | `1.0` | Recommended |
 | `http.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
 | `http.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
-| [`net.host.name`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [3] | `localhost` | Required |
-| [`net.host.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [4] | `8080` | Conditionally Required: [5] |
+| [`net.host.name`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [2] | `localhost` | Required |
+| [`net.host.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [3] | `8080` | Conditionally Required: [4] |
 
 **[1]:** MUST NOT be populated when this is not supported by the HTTP server framework as the route attribute should have low-cardinality and the URI path can NOT substitute it.
 SHOULD include the [application root](/specification/trace/semantic_conventions/http.md#http-server-definitions) if there is one.
 
-**[2]:** If `net.transport` is not specified, it can be assumed to be `IP.TCP` except if `http.flavor` is `QUIC`, in which case `IP.UDP` is assumed.
-
-**[3]:** Determined by using the first of the following that applies
+**[2]:** Determined by using the first of the following that applies
 
 - The [primary server name](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host. MUST only
   include host identifier.
@@ -146,14 +142,14 @@ SHOULD include the [application root](/specification/trace/semantic_conventions/
 
 SHOULD NOT be set if only IP address is available and capturing name would require a reverse DNS lookup.
 
-**[4]:** Determined by using the first of the following that applies
+**[3]:** Determined by using the first of the following that applies
 
 - Port identifier of the [primary server host](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host.
 - Port identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form.
 - Port identifier of the `Host` header
 
-**[5]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[4]:** If not default (`80` for `http` scheme, `443` for `https`).
 
 `http.flavor` 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.
 
@@ -182,18 +178,16 @@ This metric is optional.
 |---|---|---|---|---|
 | `http.scheme` | string | The URI scheme identifying the used protocol. | `http`; `https` | Required |
 | `http.route` | string | The matched route (path template in the format used by the respective server framework). See note below [1] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
-| `http.flavor` | string | Kind of HTTP protocol used. [2] | `1.0` | Recommended |
+| `http.flavor` | string | Kind of HTTP protocol used. | `1.0` | Recommended |
 | `http.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
 | `http.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
-| [`net.host.name`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [3] | `localhost` | Required |
-| [`net.host.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [4] | `8080` | Conditionally Required: [5] |
+| [`net.host.name`](../../trace/semantic_conventions/span-general.md) | string | Name of the local HTTP server that received the request. [2] | `localhost` | Required |
+| [`net.host.port`](../../trace/semantic_conventions/span-general.md) | int | Port of the local HTTP server that received the request. [3] | `8080` | Conditionally Required: [4] |
 
 **[1]:** MUST NOT be populated when this is not supported by the HTTP server framework as the route attribute should have low-cardinality and the URI path can NOT substitute it.
 SHOULD include the [application root](/specification/trace/semantic_conventions/http.md#http-server-definitions) if there is one.
 
-**[2]:** If `net.transport` is not specified, it can be assumed to be `IP.TCP` except if `http.flavor` is `QUIC`, in which case `IP.UDP` is assumed.
-
-**[3]:** Determined by using the first of the following that applies
+**[2]:** Determined by using the first of the following that applies
 
 - The [primary server name](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host. MUST only
   include host identifier.
@@ -203,14 +197,14 @@ SHOULD include the [application root](/specification/trace/semantic_conventions/
 
 SHOULD NOT be set if only IP address is available and capturing name would require a reverse DNS lookup.
 
-**[4]:** Determined by using the first of the following that applies
+**[3]:** Determined by using the first of the following that applies
 
 - Port identifier of the [primary server host](/specification/trace/semantic_conventions/http.md#http-server-definitions) of the matched virtual host.
 - Port identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form.
 - Port identifier of the `Host` header
 
-**[5]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[4]:** If not default (`80` for `http` scheme, `443` for `https`).
 
 `http.flavor` 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.
 
@@ -239,26 +233,24 @@ This metric is required.
 <!-- semconv metric.http.client.duration(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `http.flavor` | string | Kind of HTTP protocol used. [1] | `1.0` | Recommended |
+| `http.flavor` | string | Kind of HTTP protocol used. | `1.0` | Recommended |
 | `http.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
 | `http.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
-| [`net.peer.name`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [2] | `example.com` | Required |
-| [`net.peer.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `80`; `8080`; `443` | Conditionally Required: [4] |
+| [`net.peer.name`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [1] | `example.com` | Required |
+| [`net.peer.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [2] | `80`; `8080`; `443` | Conditionally Required: [3] |
 | [`net.sock.peer.addr`](../../trace/semantic_conventions/span-general.md) | string | Remote socket peer address: IPv4 or IPv6 for internet protocols, path for local communication, [etc](https://man7.org/linux/man-pages/man7/address_families.7.html). | `127.0.0.1`; `/tmp/mysql.sock` | Recommended |
 
-**[1]:** If `net.transport` is not specified, it can be assumed to be `IP.TCP` except if `http.flavor` is `QUIC`, in which case `IP.UDP` is assumed.
-
-**[2]:** Determined by using the first of the following that applies
+**[1]:** Determined by using the first of the following that applies
 
 - Host identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form
 - Host identifier of the `Host` header
 
 SHOULD NOT be set if capturing it would require an extra DNS lookup.
 
-**[3]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `net.peer.name` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
+**[2]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `net.peer.name` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
 
-**[4]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[3]:** If not default (`80` for `http` scheme, `443` for `https`).
 
 `http.flavor` 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.
 
@@ -285,26 +277,24 @@ This metric is optional.
 <!-- semconv metric.http.client.request.size(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `http.flavor` | string | Kind of HTTP protocol used. [1] | `1.0` | Recommended |
+| `http.flavor` | string | Kind of HTTP protocol used. | `1.0` | Recommended |
 | `http.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
 | `http.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
-| [`net.peer.name`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [2] | `example.com` | Required |
-| [`net.peer.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `80`; `8080`; `443` | Conditionally Required: [4] |
+| [`net.peer.name`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [1] | `example.com` | Required |
+| [`net.peer.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [2] | `80`; `8080`; `443` | Conditionally Required: [3] |
 | [`net.sock.peer.addr`](../../trace/semantic_conventions/span-general.md) | string | Remote socket peer address: IPv4 or IPv6 for internet protocols, path for local communication, [etc](https://man7.org/linux/man-pages/man7/address_families.7.html). | `127.0.0.1`; `/tmp/mysql.sock` | Recommended |
 
-**[1]:** If `net.transport` is not specified, it can be assumed to be `IP.TCP` except if `http.flavor` is `QUIC`, in which case `IP.UDP` is assumed.
-
-**[2]:** Determined by using the first of the following that applies
+**[1]:** Determined by using the first of the following that applies
 
 - Host identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form
 - Host identifier of the `Host` header
 
 SHOULD NOT be set if capturing it would require an extra DNS lookup.
 
-**[3]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `net.peer.name` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
+**[2]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `net.peer.name` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
 
-**[4]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[3]:** If not default (`80` for `http` scheme, `443` for `https`).
 
 `http.flavor` 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.
 
@@ -331,26 +321,24 @@ This metric is optional.
 <!-- semconv metric.http.client.response.size(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `http.flavor` | string | Kind of HTTP protocol used. [1] | `1.0` | Recommended |
+| `http.flavor` | string | Kind of HTTP protocol used. | `1.0` | Recommended |
 | `http.method` | string | HTTP request method. | `GET`; `POST`; `HEAD` | Required |
 | `http.status_code` | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
-| [`net.peer.name`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [2] | `example.com` | Required |
-| [`net.peer.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `80`; `8080`; `443` | Conditionally Required: [4] |
+| [`net.peer.name`](../../trace/semantic_conventions/span-general.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [1] | `example.com` | Required |
+| [`net.peer.port`](../../trace/semantic_conventions/span-general.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [2] | `80`; `8080`; `443` | Conditionally Required: [3] |
 | [`net.sock.peer.addr`](../../trace/semantic_conventions/span-general.md) | string | Remote socket peer address: IPv4 or IPv6 for internet protocols, path for local communication, [etc](https://man7.org/linux/man-pages/man7/address_families.7.html). | `127.0.0.1`; `/tmp/mysql.sock` | Recommended |
 
-**[1]:** If `net.transport` is not specified, it can be assumed to be `IP.TCP` except if `http.flavor` is `QUIC`, in which case `IP.UDP` is assumed.
-
-**[2]:** Determined by using the first of the following that applies
+**[1]:** Determined by using the first of the following that applies
 
 - Host identifier of the [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource)
   if it's sent in absolute-form
 - Host identifier of the `Host` header
 
 SHOULD NOT be set if capturing it would require an extra DNS lookup.
 
-**[3]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `net.peer.name` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
+**[2]:** When [request target](https://www.rfc-editor.org/rfc/rfc9110.html#target.resource) is absolute URI, `net.peer.name` MUST match URI port identifier, otherwise it MUST match `Host` header port identifier.
 
-**[4]:** If not default (`80` for `http` scheme, `443` for `https`).
+**[3]:** If not default (`80` for `http` scheme, `443` for `https`).
 
 `http.flavor` 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.