diff --git a/docs/dotnet/dotnet-http-metrics.md b/docs/dotnet/dotnet-http-metrics.md
index 7ff310a2d4..8de9cc7c46 100644
--- a/docs/dotnet/dotnet-http-metrics.md
+++ b/docs/dotnet/dotnet-http-metrics.md
@@ -49,7 +49,7 @@ Notes:
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
 | `http.connection.state` | string | State of HTTP connection in the HTTP connection pool. | `active`; `idle` | Required |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the application layer protocol used. See note below. [1] | `1.1`; `2` | Recommended |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [1] | `1.1`; `2` | Recommended |
 | [`server.address`](../general/attributes.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 |
 | [`server.port`](../general/attributes.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] |
 | [`server.socket.address`](../general/attributes.md) | string | Server address of the socket connection - IP address or Unix domain socket name. [5] | `10.5.3.2` | Recommended: If different than `server.address`. |
@@ -91,7 +91,7 @@ When observed from the server side, this SHOULD represent the physical server ad
 <!-- semconv metric.dotnet.http.client.connection.duration(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the application layer protocol used. See note below. [1] | `1.1`; `2` | Recommended |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [1] | `1.1`; `2` | Recommended |
 | [`server.address`](../general/attributes.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 |
 | [`server.port`](../general/attributes.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] |
 | [`server.socket.address`](../general/attributes.md) | string | Server address of the socket connection - IP address or Unix domain socket name. [5] | `10.5.3.2` | Recommended: If different than `server.address`. |
@@ -127,7 +127,7 @@ When observed from the server side, this SHOULD represent the physical server ad
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
 | `http.request.method` | string | HTTP request method. [1] | `GET`; `POST`; `HEAD` | Required |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the application layer protocol used. See note below. [2] | `1.1`; `2` | Recommended |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [2] | `1.1`; `2` | Recommended |
 | [`server.address`](../general/attributes.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `example.com` | Required |
 | [`server.port`](../general/attributes.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [4] | `80`; `8080`; `443` | Conditionally Required: [5] |
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `http`; `https`; `ftp` | Recommended |
@@ -189,7 +189,7 @@ Tracing instrumentations that do so, MUST also set `http.request.method_original
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
 | `http.request.method` | string | HTTP request method. [1] | `GET`; `POST`; `HEAD` | Required |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the application layer protocol used. See note below. [2] | `1.1`; `2` | Recommended |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [2] | `1.1`; `2` | Recommended |
 | [`server.address`](../general/attributes.md) | string | Host identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [3] | `example.com` | Required |
 | [`server.port`](../general/attributes.md) | int | Port identifier of the ["URI origin"](https://www.rfc-editor.org/rfc/rfc9110.html#name-uri-origin) HTTP request is sent to. [4] | `80`; `8080`; `443` | Conditionally Required: [5] |
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `http`; `https`; `ftp` | Recommended |
@@ -242,10 +242,9 @@ Notes:
 - Meter name is `Microsoft.AspNetCore.Hosting`
 - Metric added in ASP.NET Core 8.0
 - Opt-in `server.address` and `server.port` attributes are not reported
-- Additional attributes
+- Additional attributes:
 
   - The `aspnetcore.request.is_unhandled` boolean attribute is reported when the request was **not** handled by the application pipeline. It's skipped otherwise.
-  - The `exception.type` string attribute is reported if and only if the request ended with an error. It includes full exception type. <!--TODO: can we change it to `error.type` ?-->
 
 ### Metric: `http.server.active_requests`
 
diff --git a/docs/dotnet/dotnet-kestrel-metrics.md b/docs/dotnet/dotnet-kestrel-metrics.md
index 9eec8ccc8c..7ff5d58e6b 100644
--- a/docs/dotnet/dotnet-kestrel-metrics.md
+++ b/docs/dotnet/dotnet-kestrel-metrics.md
@@ -41,15 +41,23 @@ and `network.transport` value to corresponding `endpoint.AddressFamily` property
 <!-- semconv metric.kestrel.active_connections(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| [`network.transport`](../general/attributes.md) | string | [OSI Transport Layer](https://osi-model.com/transport-layer/) or [Inter-process Communication method](https://en.wikipedia.org/wiki/Inter-process_communication). The value SHOULD be normalized to lowercase. Consider always setting the transport when setting a port number, since a port number is ambiguous without knowing the transport, for example different processes could be listening on TCP port 12345 and UDP port 12345. | `tcp`; `unix` | Recommended |
-| [`network.type`](../general/attributes.md) | string | [OSI Network Layer](https://osi-model.com/network-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
-| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [1] | `example.com` | Recommended |
-| [`server.port`](../general/attributes.md) | int | Server port number [2] | `80`; `8080`; `443` | Recommended |
+| [`network.transport`](../general/attributes.md) | string | [OSI transport layer](https://osi-model.com/transport-layer/) or [inter-process communication method](https://en.wikipedia.org/wiki/Inter-process_communication). [1] | `tcp`; `unix` | Recommended |
+| [`network.type`](../general/attributes.md) | string | [OSI network layer](https://osi-model.com/network-layer/) or non-OSI equivalent. [2] | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
+| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [3] | `example.com` | Recommended |
+| [`server.port`](../general/attributes.md) | int | Server port number [4] | `80`; `8080`; `443` | Recommended |
 
-**[1]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
+**[1]:** The value SHOULD be normalized to lowercase.
+
+Consider always setting the transport when setting a port number, since
+a port number is ambiguous without knowing the transport, for example
+different processes could be listening on TCP port 12345 and UDP port 12345.
+
+**[2]:** The value SHOULD be normalized to lowercase.
+
+**[3]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
 the server address behind any intermediaries (e.g. proxies) if it's available.
 
-**[2]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
+**[4]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
 
 `network.transport` 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.
 
@@ -81,21 +89,51 @@ the server address behind any intermediaries (e.g. proxies) if it's available.
 <!-- semconv metric.kestrel.connection.duration(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `exception.type` | string | The full name of exception type. | `System.OperationCanceledException`; `Contoso.MyException` | Conditionally Required: if and only if an exception was thrown. |
-| [`network.protocol.name`](../general/attributes.md) | string | [OSI Application Layer](https://osi-model.com/application-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `http`; `web_sockets` | Recommended |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the application layer protocol used. See note below. [1] | `1.1`; `2` | Recommended |
-| [`network.transport`](../general/attributes.md) | string | [OSI Transport Layer](https://osi-model.com/transport-layer/) or [Inter-process Communication method](https://en.wikipedia.org/wiki/Inter-process_communication). The value SHOULD be normalized to lowercase. Consider always setting the transport when setting a port number, since a port number is ambiguous without knowing the transport, for example different processes could be listening on TCP port 12345 and UDP port 12345. | `tcp`; `unix` | Recommended |
-| [`network.type`](../general/attributes.md) | string | [OSI Network Layer](https://osi-model.com/network-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
-| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [2] | `example.com` | Recommended |
-| [`server.port`](../general/attributes.md) | int | Server port number [3] | `80`; `8080`; `443` | Recommended |
+| `error.type` | string | The full name of exception type. [1] | `System.OperationCanceledException`; `Contoso.MyException` | Conditionally Required: if and only if an exception was thrown. |
+| [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [2] | `http`; `web_sockets` | Recommended |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [3] | `1.1`; `2` | Recommended |
+| [`network.transport`](../general/attributes.md) | string | [OSI transport layer](https://osi-model.com/transport-layer/) or [inter-process communication method](https://en.wikipedia.org/wiki/Inter-process_communication). [4] | `tcp`; `unix` | Recommended |
+| [`network.type`](../general/attributes.md) | string | [OSI network layer](https://osi-model.com/network-layer/) or non-OSI equivalent. [5] | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
+| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [6] | `example.com` | Recommended |
+| [`server.port`](../general/attributes.md) | int | Server port number [7] | `80`; `8080`; `443` | Recommended |
 | `tls.protocol.version` | string | TLS protocol version. | `1.2`; `1.3` | Conditionally Required: if the connection is secured with TLS. |
 
-**[1]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[1]:** The `error.type` SHOULD be predictable and SHOULD have low cardinality.
+Instrumentations SHOULD document the list of errors they report.
+
+The cardinality of `error.type` within one instrumentation library SHOULD be low, but
+telemetry consumers that aggregate data from multiple instrumentation libraries and applications
+should be prepared for `error.type` to have high cardinality at query time, when no
+additional filters are applied.
+
+If the operation has completed successfully, instrumentations SHOULD NOT set `error.type`.
+
+If a specific domain defines its own set of error codes (such as HTTP or gRPC status codes),
+it's RECOMMENDED to use a domain-specific attribute and also set `error.type` to capture
+all errors, regardless of whether they are defined within the domain-specific set or not.
+
+**[2]:** The value SHOULD be normalized to lowercase.
+
+**[3]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[4]:** The value SHOULD be normalized to lowercase.
+
+Consider always setting the transport when setting a port number, since
+a port number is ambiguous without knowing the transport, for example
+different processes could be listening on TCP port 12345 and UDP port 12345.
+
+**[5]:** The value SHOULD be normalized to lowercase.
 
-**[2]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
+**[6]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
 the server address behind any intermediaries (e.g. proxies) if it's available.
 
-**[3]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
+**[7]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
+
+`error.type` 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 |
+|---|---|
+| `_OTHER` | A fallback error value to be used when the instrumentation does not define a custom value for it. |
 
 `network.transport` 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.
 
@@ -128,15 +166,23 @@ Meter name: `Microsoft.AspNetCore.Server.Kestrel`; Added in: ASP.NET Core 8.0
 <!-- semconv metric.kestrel.rejected_connections(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| [`network.transport`](../general/attributes.md) | string | [OSI Transport Layer](https://osi-model.com/transport-layer/) or [Inter-process Communication method](https://en.wikipedia.org/wiki/Inter-process_communication). The value SHOULD be normalized to lowercase. Consider always setting the transport when setting a port number, since a port number is ambiguous without knowing the transport, for example different processes could be listening on TCP port 12345 and UDP port 12345. | `tcp`; `unix` | Recommended |
-| [`network.type`](../general/attributes.md) | string | [OSI Network Layer](https://osi-model.com/network-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
-| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [1] | `example.com` | Recommended |
-| [`server.port`](../general/attributes.md) | int | Server port number [2] | `80`; `8080`; `443` | Recommended |
+| [`network.transport`](../general/attributes.md) | string | [OSI transport layer](https://osi-model.com/transport-layer/) or [inter-process communication method](https://en.wikipedia.org/wiki/Inter-process_communication). [1] | `tcp`; `unix` | Recommended |
+| [`network.type`](../general/attributes.md) | string | [OSI network layer](https://osi-model.com/network-layer/) or non-OSI equivalent. [2] | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
+| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [3] | `example.com` | Recommended |
+| [`server.port`](../general/attributes.md) | int | Server port number [4] | `80`; `8080`; `443` | Recommended |
+
+**[1]:** The value SHOULD be normalized to lowercase.
 
-**[1]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
+Consider always setting the transport when setting a port number, since
+a port number is ambiguous without knowing the transport, for example
+different processes could be listening on TCP port 12345 and UDP port 12345.
+
+**[2]:** The value SHOULD be normalized to lowercase.
+
+**[3]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
 the server address behind any intermediaries (e.g. proxies) if it's available.
 
-**[2]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
+**[4]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
 
 `network.transport` 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.
 
@@ -168,15 +214,23 @@ the server address behind any intermediaries (e.g. proxies) if it's available.
 <!-- semconv metric.kestrel.queued_connections(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| [`network.transport`](../general/attributes.md) | string | [OSI Transport Layer](https://osi-model.com/transport-layer/) or [Inter-process Communication method](https://en.wikipedia.org/wiki/Inter-process_communication). The value SHOULD be normalized to lowercase. Consider always setting the transport when setting a port number, since a port number is ambiguous without knowing the transport, for example different processes could be listening on TCP port 12345 and UDP port 12345. | `tcp`; `unix` | Recommended |
-| [`network.type`](../general/attributes.md) | string | [OSI Network Layer](https://osi-model.com/network-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
-| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [1] | `example.com` | Recommended |
-| [`server.port`](../general/attributes.md) | int | Server port number [2] | `80`; `8080`; `443` | Recommended |
+| [`network.transport`](../general/attributes.md) | string | [OSI transport layer](https://osi-model.com/transport-layer/) or [inter-process communication method](https://en.wikipedia.org/wiki/Inter-process_communication). [1] | `tcp`; `unix` | Recommended |
+| [`network.type`](../general/attributes.md) | string | [OSI network layer](https://osi-model.com/network-layer/) or non-OSI equivalent. [2] | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
+| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [3] | `example.com` | Recommended |
+| [`server.port`](../general/attributes.md) | int | Server port number [4] | `80`; `8080`; `443` | Recommended |
+
+**[1]:** The value SHOULD be normalized to lowercase.
+
+Consider always setting the transport when setting a port number, since
+a port number is ambiguous without knowing the transport, for example
+different processes could be listening on TCP port 12345 and UDP port 12345.
+
+**[2]:** The value SHOULD be normalized to lowercase.
 
-**[1]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
+**[3]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
 the server address behind any intermediaries (e.g. proxies) if it's available.
 
-**[2]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
+**[4]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
 
 `network.transport` 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.
 
@@ -208,19 +262,29 @@ the server address behind any intermediaries (e.g. proxies) if it's available.
 <!-- semconv metric.kestrel.queued_requests(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| [`network.protocol.name`](../general/attributes.md) | string | [OSI Application Layer](https://osi-model.com/application-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `http`; `web_sockets` | Recommended |
-| [`network.protocol.version`](../general/attributes.md) | string | Version of the application layer protocol used. See note below. [1] | `1.1`; `2` | Recommended |
-| [`network.transport`](../general/attributes.md) | string | [OSI Transport Layer](https://osi-model.com/transport-layer/) or [Inter-process Communication method](https://en.wikipedia.org/wiki/Inter-process_communication). The value SHOULD be normalized to lowercase. Consider always setting the transport when setting a port number, since a port number is ambiguous without knowing the transport, for example different processes could be listening on TCP port 12345 and UDP port 12345. | `tcp`; `unix` | Recommended |
-| [`network.type`](../general/attributes.md) | string | [OSI Network Layer](https://osi-model.com/network-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
-| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [2] | `example.com` | Recommended |
-| [`server.port`](../general/attributes.md) | int | Server port number [3] | `80`; `8080`; `443` | Recommended |
+| [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [1] | `http`; `web_sockets` | Recommended |
+| [`network.protocol.version`](../general/attributes.md) | string | Version of the protocol specified in `network.protocol.name`. [2] | `1.1`; `2` | Recommended |
+| [`network.transport`](../general/attributes.md) | string | [OSI transport layer](https://osi-model.com/transport-layer/) or [inter-process communication method](https://en.wikipedia.org/wiki/Inter-process_communication). [3] | `tcp`; `unix` | Recommended |
+| [`network.type`](../general/attributes.md) | string | [OSI network layer](https://osi-model.com/network-layer/) or non-OSI equivalent. [4] | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
+| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [5] | `example.com` | Recommended |
+| [`server.port`](../general/attributes.md) | int | Server port number [6] | `80`; `8080`; `443` | Recommended |
 
-**[1]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+**[1]:** The value SHOULD be normalized to lowercase.
 
-**[2]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
+**[2]:** `network.protocol.version` refers to the version of the protocol used and might be different from the protocol client's version. If the HTTP client used has a version of `0.27.2`, but sends HTTP version `1.1`, this attribute should be set to `1.1`.
+
+**[3]:** The value SHOULD be normalized to lowercase.
+
+Consider always setting the transport when setting a port number, since
+a port number is ambiguous without knowing the transport, for example
+different processes could be listening on TCP port 12345 and UDP port 12345.
+
+**[4]:** The value SHOULD be normalized to lowercase.
+
+**[5]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
 the server address behind any intermediaries (e.g. proxies) if it's available.
 
-**[3]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
+**[6]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
 
 `network.transport` 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.
 
@@ -254,15 +318,23 @@ Meter name: `Microsoft.AspNetCore.Server.Kestrel`; Added in: ASP.NET Core 8.0
 <!-- semconv metric.kestrel.upgraded_connections(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| [`network.transport`](../general/attributes.md) | string | [OSI Transport Layer](https://osi-model.com/transport-layer/) or [Inter-process Communication method](https://en.wikipedia.org/wiki/Inter-process_communication). The value SHOULD be normalized to lowercase. Consider always setting the transport when setting a port number, since a port number is ambiguous without knowing the transport, for example different processes could be listening on TCP port 12345 and UDP port 12345. | `tcp`; `unix` | Recommended |
-| [`network.type`](../general/attributes.md) | string | [OSI Network Layer](https://osi-model.com/network-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
-| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [1] | `example.com` | Recommended |
-| [`server.port`](../general/attributes.md) | int | Server port number [2] | `80`; `8080`; `443` | Recommended |
+| [`network.transport`](../general/attributes.md) | string | [OSI transport layer](https://osi-model.com/transport-layer/) or [inter-process communication method](https://en.wikipedia.org/wiki/Inter-process_communication). [1] | `tcp`; `unix` | Recommended |
+| [`network.type`](../general/attributes.md) | string | [OSI network layer](https://osi-model.com/network-layer/) or non-OSI equivalent. [2] | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
+| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [3] | `example.com` | Recommended |
+| [`server.port`](../general/attributes.md) | int | Server port number [4] | `80`; `8080`; `443` | Recommended |
+
+**[1]:** The value SHOULD be normalized to lowercase.
+
+Consider always setting the transport when setting a port number, since
+a port number is ambiguous without knowing the transport, for example
+different processes could be listening on TCP port 12345 and UDP port 12345.
 
-**[1]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
+**[2]:** The value SHOULD be normalized to lowercase.
+
+**[3]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
 the server address behind any intermediaries (e.g. proxies) if it's available.
 
-**[2]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
+**[4]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
 
 `network.transport` 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.
 
@@ -294,17 +366,45 @@ the server address behind any intermediaries (e.g. proxies) if it's available.
 <!-- semconv metric.kestrel.tls_handshake.duration(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `exception.type` | string | The full name of exception type. | `System.OperationCanceledException`; `Contoso.MyException` | Conditionally Required: if and only if an exception was thrown. |
-| [`network.transport`](../general/attributes.md) | string | [OSI Transport Layer](https://osi-model.com/transport-layer/) or [Inter-process Communication method](https://en.wikipedia.org/wiki/Inter-process_communication). The value SHOULD be normalized to lowercase. Consider always setting the transport when setting a port number, since a port number is ambiguous without knowing the transport, for example different processes could be listening on TCP port 12345 and UDP port 12345. | `tcp`; `unix` | Recommended |
-| [`network.type`](../general/attributes.md) | string | [OSI Network Layer](https://osi-model.com/network-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
-| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [1] | `example.com` | Recommended |
-| [`server.port`](../general/attributes.md) | int | Server port number [2] | `80`; `8080`; `443` | Recommended |
+| `error.type` | string | The full name of exception type. [1] | `System.OperationCanceledException`; `Contoso.MyException` | Conditionally Required: if and only if an exception was thrown. |
+| [`network.transport`](../general/attributes.md) | string | [OSI transport layer](https://osi-model.com/transport-layer/) or [inter-process communication method](https://en.wikipedia.org/wiki/Inter-process_communication). [2] | `tcp`; `unix` | Recommended |
+| [`network.type`](../general/attributes.md) | string | [OSI network layer](https://osi-model.com/network-layer/) or non-OSI equivalent. [3] | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
+| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [4] | `example.com` | Recommended |
+| [`server.port`](../general/attributes.md) | int | Server port number [5] | `80`; `8080`; `443` | Recommended |
 | `tls.protocol.version` | string | TLS protocol version. | `1.2`; `1.3` | Conditionally Required: if the connection is secured with TLS. |
 
-**[1]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
+**[1]:** The `error.type` SHOULD be predictable and SHOULD have low cardinality.
+Instrumentations SHOULD document the list of errors they report.
+
+The cardinality of `error.type` within one instrumentation library SHOULD be low, but
+telemetry consumers that aggregate data from multiple instrumentation libraries and applications
+should be prepared for `error.type` to have high cardinality at query time, when no
+additional filters are applied.
+
+If the operation has completed successfully, instrumentations SHOULD NOT set `error.type`.
+
+If a specific domain defines its own set of error codes (such as HTTP or gRPC status codes),
+it's RECOMMENDED to use a domain-specific attribute and also set `error.type` to capture
+all errors, regardless of whether they are defined within the domain-specific set or not.
+
+**[2]:** The value SHOULD be normalized to lowercase.
+
+Consider always setting the transport when setting a port number, since
+a port number is ambiguous without knowing the transport, for example
+different processes could be listening on TCP port 12345 and UDP port 12345.
+
+**[3]:** The value SHOULD be normalized to lowercase.
+
+**[4]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
 the server address behind any intermediaries (e.g. proxies) if it's available.
 
-**[2]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
+**[5]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
+
+`error.type` 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 |
+|---|---|
+| `_OTHER` | A fallback error value to be used when the instrumentation does not define a custom value for it. |
 
 `network.transport` 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.
 
@@ -336,15 +436,23 @@ the server address behind any intermediaries (e.g. proxies) if it's available.
 <!-- semconv metric.kestrel.active_tls_handshakes(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| [`network.transport`](../general/attributes.md) | string | [OSI Transport Layer](https://osi-model.com/transport-layer/) or [Inter-process Communication method](https://en.wikipedia.org/wiki/Inter-process_communication). The value SHOULD be normalized to lowercase. Consider always setting the transport when setting a port number, since a port number is ambiguous without knowing the transport, for example different processes could be listening on TCP port 12345 and UDP port 12345. | `tcp`; `unix` | Recommended |
-| [`network.type`](../general/attributes.md) | string | [OSI Network Layer](https://osi-model.com/network-layer/) or non-OSI equivalent. The value SHOULD be normalized to lowercase. | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
-| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [1] | `example.com` | Recommended |
-| [`server.port`](../general/attributes.md) | int | Server port number [2] | `80`; `8080`; `443` | Recommended |
+| [`network.transport`](../general/attributes.md) | string | [OSI transport layer](https://osi-model.com/transport-layer/) or [inter-process communication method](https://en.wikipedia.org/wiki/Inter-process_communication). [1] | `tcp`; `unix` | Recommended |
+| [`network.type`](../general/attributes.md) | string | [OSI network layer](https://osi-model.com/network-layer/) or non-OSI equivalent. [2] | `ipv4`; `ipv6` | Recommended: if the transport is `tcp` or `udp` |
+| [`server.address`](../general/attributes.md) | string | Server address - domain name if available without reverse DNS lookup, otherwise IP address or Unix domain socket name. [3] | `example.com` | Recommended |
+| [`server.port`](../general/attributes.md) | int | Server port number [4] | `80`; `8080`; `443` | Recommended |
+
+**[1]:** The value SHOULD be normalized to lowercase.
+
+Consider always setting the transport when setting a port number, since
+a port number is ambiguous without knowing the transport, for example
+different processes could be listening on TCP port 12345 and UDP port 12345.
+
+**[2]:** The value SHOULD be normalized to lowercase.
 
-**[1]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
+**[3]:** When observed from the client side, and when communicating through an intermediary, `server.address` SHOULD represent
 the server address behind any intermediaries (e.g. proxies) if it's available.
 
-**[2]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
+**[4]:** When observed from the client side, and when communicating through an intermediary, `server.port` SHOULD represent the server port behind any intermediaries (e.g. proxies) if it's available.
 
 `network.transport` 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.
 
diff --git a/model/metrics/dotnet/dotnet-kestrel.yaml b/model/metrics/dotnet/dotnet-kestrel.yaml
index 3c433ebea8..15e3818b03 100644
--- a/model/metrics/dotnet/dotnet-kestrel.yaml
+++ b/model/metrics/dotnet/dotnet-kestrel.yaml
@@ -47,7 +47,7 @@ groups:
       - ref: network.protocol.version
         examples: ["1.1", "2"]
       - ref: tls.protocol.version
-      - ref: exception.type
+      - ref: error.type
         brief: The full name of exception type.
         requirement_level:
           conditionally_required: if and only if an exception was thrown.
@@ -112,7 +112,7 @@ groups:
     extends: common.kestrel.attributes
     attributes:
       - ref: tls.protocol.version
-      - ref: exception.type
+      - ref: error.type
         brief: The full name of exception type.
         requirement_level:
           conditionally_required: if and only if an exception was thrown.