Clarify that error.type should be the fully-qualified exception class name (if applicable) when it represents an exception type

CHANGELOG.md

@@ -13,6 +13,10 @@ release.
 
 ### Fixes
 
+- Clarify that `error.type` should be the fully-qualified exception class name
+  when it represents an exception type.
+  ([#387](https://github.com/open-telemetry/semantic-conventions/pull/387))
+
 ## v1.22.0 (2023-10-12)
 
 - Remove experimental Kafka metrics ([#338](https://github.com/open-telemetry/semantic-conventions/pull/338))

docs/http/http-metrics.md

@@ -76,7 +76,7 @@ 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(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `name_resolution_error`; `500` | Conditionally Required: If request has ended with an error. |
+| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | Conditionally Required: If request has ended with an error. |
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`http.route`](../attributes-registry/http.md) | string | The matched route (path template in the format used by the respective server framework). See note below [3] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
@@ -87,10 +87,11 @@ 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
 | [`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` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
-`error.type` SHOULD be set to exception type or a component-specific low cardinality error code.
+`error.type` SHOULD be set to exception type (its fully-qualified class name, if applicable)
+or a component-specific low cardinality error identifier.
 
 If response status code was sent or received and status indicates an error according to [HTTP span status definition](/docs/http/http-spans.md),
-`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error code.
+`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error identifier.
 
 The `error.type` value SHOULD be predictable and SHOULD have low cardinality.
 Instrumentations SHOULD document the list of errors they report.
@@ -248,7 +249,7 @@ This metric is optional.
 <!-- semconv metric.http.server.request.body.size(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `name_resolution_error`; `500` | Conditionally Required: If request has ended with an error. |
+| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | Conditionally Required: If request has ended with an error. |
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`http.route`](../attributes-registry/http.md) | string | The matched route (path template in the format used by the respective server framework). See note below [3] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
@@ -259,10 +260,11 @@ This metric is optional.
 | [`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` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
-`error.type` SHOULD be set to exception type or a component-specific low cardinality error code.
+`error.type` SHOULD be set to exception type (its fully-qualified class name, if applicable)
+or a component-specific low cardinality error identifier.
 
 If response status code was sent or received and status indicates an error according to [HTTP span status definition](/docs/http/http-spans.md),
-`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error code.
+`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error identifier.
 
 The `error.type` value SHOULD be predictable and SHOULD have low cardinality.
 Instrumentations SHOULD document the list of errors they report.
@@ -352,7 +354,7 @@ This metric is optional.
 <!-- semconv metric.http.server.response.body.size(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `name_resolution_error`; `500` | Conditionally Required: If request has ended with an error. |
+| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | Conditionally Required: If request has ended with an error. |
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`http.route`](../attributes-registry/http.md) | string | The matched route (path template in the format used by the respective server framework). See note below [3] | `/users/:userID?`; `{controller}/{action}/{id?}` | Conditionally Required: If and only if it's available |
@@ -363,10 +365,11 @@ This metric is optional.
 | [`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` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
-`error.type` SHOULD be set to exception type or a component-specific low cardinality error code.
+`error.type` SHOULD be set to exception type (its fully-qualified class name, if applicable)
+or a component-specific low cardinality error identifier.
 
 If response status code was sent or received and status indicates an error according to [HTTP span status definition](/docs/http/http-spans.md),
-`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error code.
+`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error identifier.
 
 The `error.type` value SHOULD be predictable and SHOULD have low cardinality.
 Instrumentations SHOULD document the list of errors they report.
@@ -462,7 +465,7 @@ 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(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `name_resolution_error`; `500` | Conditionally Required: If request has ended with an error. |
+| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | Conditionally Required: If request has ended with an error. |
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [3] | `http`; `spdy` | Recommended: if not default (`http`). |
@@ -472,10 +475,11 @@ 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
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `https`; `ftp`; `telnet` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
-`error.type` SHOULD be set to exception type or a component-specific low cardinality error code.
+`error.type` SHOULD be set to exception type (its fully-qualified class name, if applicable)
+or a component-specific low cardinality error identifier.
 
 If response status code was sent or received and status indicates an error according to [HTTP span status definition](/docs/http/http-spans.md),
-`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error code.
+`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error identifier.
 
 The `error.type` value SHOULD be predictable and SHOULD have low cardinality.
 Instrumentations SHOULD document the list of errors they report.
@@ -558,7 +562,7 @@ This metric is optional.
 <!-- semconv metric.http.client.request.body.size(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `name_resolution_error`; `500` | Conditionally Required: If request has ended with an error. |
+| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | Conditionally Required: If request has ended with an error. |
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [3] | `http`; `spdy` | Recommended: if not default (`http`). |
@@ -568,10 +572,11 @@ This metric is optional.
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `https`; `ftp`; `telnet` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
-`error.type` SHOULD be set to exception type or a component-specific low cardinality error code.
+`error.type` SHOULD be set to exception type (its fully-qualified class name, if applicable)
+or a component-specific low cardinality error identifier.
 
 If response status code was sent or received and status indicates an error according to [HTTP span status definition](/docs/http/http-spans.md),
-`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error code.
+`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error identifier.
 
 The `error.type` value SHOULD be predictable and SHOULD have low cardinality.
 Instrumentations SHOULD document the list of errors they report.
@@ -654,7 +659,7 @@ This metric is optional.
 <!-- semconv metric.http.client.response.body.size(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `name_resolution_error`; `500` | Conditionally Required: If request has ended with an error. |
+| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | Conditionally Required: If request has ended with an error. |
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [2] | `GET`; `POST`; `HEAD` | Required |
 | [`http.response.status_code`](../attributes-registry/http.md) | int | [HTTP response status code](https://tools.ietf.org/html/rfc7231#section-6). | `200` | Conditionally Required: If and only if one was received/sent. |
 | [`network.protocol.name`](../general/attributes.md) | string | [OSI application layer](https://osi-model.com/application-layer/) or non-OSI equivalent. [3] | `http`; `spdy` | Recommended: if not default (`http`). |
@@ -664,10 +669,11 @@ This metric is optional.
 | [`url.scheme`](../url/url.md) | string | The [URI scheme](https://www.rfc-editor.org/rfc/rfc3986#section-3.1) component identifying the used protocol. | `https`; `ftp`; `telnet` | Required |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
-`error.type` SHOULD be set to exception type or a component-specific low cardinality error code.
+`error.type` SHOULD be set to exception type (its fully-qualified class name, if applicable)
+or a component-specific low cardinality error identifier.
 
 If response status code was sent or received and status indicates an error according to [HTTP span status definition](/docs/http/http-spans.md),
-`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error code.
+`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error identifier.
 
 The `error.type` value SHOULD be predictable and SHOULD have low cardinality.
 Instrumentations SHOULD document the list of errors they report.

docs/http/http-spans.md

@@ -115,7 +115,7 @@ sections below.
 <!-- semconv trace.http.common(full) -->
 | Attribute  | Type | Description  | Examples  | Requirement Level |
 |---|---|---|---|---|
-| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `name_resolution_error`; `500` | Conditionally Required: If request has ended with an error. |
+| `error.type` | string | Describes a class of error the operation ended with. [1] | `timeout`; `java.net.UnknownHostException`; `server_certificate_invalid`; `500` | Conditionally Required: If request has ended with an error. |
 | [`http.request.body.size`](../attributes-registry/http.md) | int | 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. | `3495` | Recommended |
 | [`http.request.header.<key>`](../attributes-registry/http.md) | string[] | HTTP request headers, `<key>` being the normalized HTTP Header name (lowercase, with `-` characters replaced by `_`), the value being the header values. [2] | `http.request.header.content_type=["application/json"]`; `http.request.header.x_forwarded_for=["1.2.3.4", "1.2.3.5"]` | Opt-In |
 | [`http.request.method`](../attributes-registry/http.md) | string | HTTP request method. [3] | `GET`; `POST`; `HEAD` | Required |
@@ -130,10 +130,11 @@ sections below.
 | `user_agent.original` | string | Value of the [HTTP User-Agent](https://www.rfc-editor.org/rfc/rfc9110.html#field.user-agent) header sent by the client. | `CERN-LineMode/2.15 libwww/2.17b3` | Recommended |
 
 **[1]:** If the request fails with an error before response status code was sent or received,
-`error.type` SHOULD be set to exception type or a component-specific low cardinality error code.
+`error.type` SHOULD be set to exception type (its fully-qualified class name, if applicable)
+or a component-specific low cardinality error identifier.
 
 If response status code was sent or received and status indicates an error according to [HTTP span status definition](/docs/http/http-spans.md),
-`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error code.
+`error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error identifier.
 
 The `error.type` value SHOULD be predictable and SHOULD have low cardinality.
 Instrumentations SHOULD document the list of errors they report.

model/error.yaml

@@ -26,6 +26,6 @@ groups:
 
           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),
+          If a specific domain defines its own set of error identifiers (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.

model/http-common.yaml

@@ -11,13 +11,14 @@ groups:
       - ref: error.type
         requirement_level:
           conditionally_required: If request has ended with an error.
-        examples: ['timeout', 'name_resolution_error', '500']
+        examples: ['timeout', 'java.net.UnknownHostException', 'server_certificate_invalid', '500']
         note: |
           If the request fails with an error before response status code was sent or received,
-          `error.type` SHOULD be set to exception type or a component-specific low cardinality error code.
+          `error.type` SHOULD be set to exception type (its fully-qualified class name, if applicable)
+          or a component-specific low cardinality error identifier.
 
           If response status code was sent or received and status indicates an error according to [HTTP span status definition](/docs/http/http-spans.md),
-          `error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error code.
+          `error.type` SHOULD be set to the status code number (represented as a string), an exception type (if thrown) or a component-specific error identifier.
 
           The `error.type` value SHOULD be predictable and SHOULD have low cardinality.
           Instrumentations SHOULD document the list of errors they report.