Define attributes equality and make all fields as identifying for Tra…

…cer, Meter, Logger, EventLogger (#4161)

CHANGELOG.md

@@ -11,17 +11,24 @@ release.
 
 ### Traces
 
+- Make all fields as identifying for Tracer. Previously attributes were omitted from being identifying.
+  ([#4161](https://github.com/open-telemetry/opentelemetry-specification/pull/4161))
+
 ### Metrics
 
 - Add support for filtering attribute keys for streams via an exclude list.
   ([#4188](https://github.com/open-telemetry/opentelemetry-specification/pull/4188))
 - Clarify that `Enabled` only applies to synchronous instruments.
   ([#4211](https://github.com/open-telemetry/opentelemetry-specification/pull/4211))
+- Make all fields as identifying for Meter. Previously attributes were omitted from being identifying.
+  ([#4161](https://github.com/open-telemetry/opentelemetry-specification/pull/4161))
 
 ### Logs
 
 - Define `Enabled` parameters for `Logger`.
   ([#4203](https://github.com/open-telemetry/opentelemetry-specification/pull/4203))
+- Make all fields as identifying for Logger. Previously attributes were omitted from being identifying.
+  ([#4161](https://github.com/open-telemetry/opentelemetry-specification/pull/4161))
 
 ### Events
 
@@ -37,6 +44,9 @@ release.
 
 ### Common
 
+- Define equality for attributes and collection of attributes.
+  ([#4161](https://github.com/open-telemetry/opentelemetry-specification/pull/4161))
+
 ### Supplementary Guidelines
 
 ## v1.37.0 (2024-09-13)

specification/common/README.md

@@ -59,6 +59,8 @@ indices that are kept in sync (e.g., two attributes `header_keys` and `header_va
 both containing an array of strings to represent a mapping
 `header_keys[i] -> header_values[i]`).
 
+Attributes are equal when their keys and values are equal.
+
 See [Attribute Naming](https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/attribute-naming.md) for naming guidelines.
 
 See [Requirement Level](https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/attribute-requirement-level.md) for requirement levels guidelines.
@@ -185,3 +187,7 @@ Some other implementations may use a streaming approach where every
 that individual attribute value being exported using a streaming wire protocol.
 In such cases the enforcement of uniqueness will likely be the responsibility of
 the recipient of this data.
+
+Collection of attributes are equal when they contain the same attributes,
+irrespective of the order in which those elements appear
+(unordered collection equality).

specification/logs/bridge-api.md

@@ -63,7 +63,7 @@ The `LoggerProvider` MUST provide the following functions:
 This API MUST accept the following [instrumentation scope](data-model.md#field-instrumentationscope)
 parameters:
 
-* `name`: This name uniquely identifies the [instrumentation scope](../glossary.md#instrumentation-scope),
+* `name`: Specifies the name of the [instrumentation scope](../glossary.md#instrumentation-scope),
   such as the [instrumentation library](../glossary.md#instrumentation-library)
   (e.g. `io.opentelemetry.contrib.mongodb`), package, module or class name.
   If an application or library has built-in OpenTelemetry instrumentation, both
@@ -85,19 +85,9 @@ parameters:
   associate with emitted telemetry. This API MUST be structured to accept a
   variable number of attributes, including none.
 
-`Logger`s are identified by `name`, `version`, and `schema_url` fields.  When more
-than one `Logger` of the same `name`, `version`, and `schema_url` is created, it
-is unspecified whether or under which conditions the same or different `Logger`
-instances are returned. It is a user error to create Loggers with different
-`attributes` but the same identity.
-
 The term *identical* applied to `Logger`s describes instances where all
-identifying fields are equal. The term *distinct* applied to `Logger`s describes
-instances where at least one identifying field has a different value.
-
-The effect of associating a Schema URL with a `Logger` MUST be that the telemetry
-emitted using the `Logger` will be associated with the Schema URL, provided that
-the emitted data format is capable of representing such association.
+parameters are equal. The term *distinct* applied to `Logger`s describes
+instances where at least one parameter has a different value.
 
 ## Logger
 

specification/logs/event-api.md

@@ -98,7 +98,7 @@ The `EventLoggerProvider` MUST provide the following functions:
 
 This API MUST accept the following parameters:
 
-* `name`: This name uniquely identifies the [instrumentation scope](../glossary.md#instrumentation-scope),
+* `name`: Specifies the name of the [instrumentation scope](../glossary.md#instrumentation-scope),
   such as the [instrumentation library](../glossary.md#instrumentation-library)
   (e.g. `io.opentelemetry.contrib.mongodb`), package, module or class name.
   If an application or library has built-in OpenTelemetry instrumentation, both
@@ -117,15 +117,9 @@ This API MUST accept the following parameters:
   associate with emitted telemetry. This API MUST be structured to accept a
   variable number of attributes, including none.
 
-`EventLogger`s are identified by `name`, `version`, and `schema_url` fields.  When more
-than one `EventLogger` of the same `name`, `version`, and `schema_url` is created, it
-is unspecified whether or under which conditions the same or different `EventLogger`
-instances are returned. It is a user error to create `EventLogger`s with different
-`attributes` but the same identity.
-
-The effect of associating a Schema URL with a `EventLogger` MUST be that the telemetry
-emitted using the `EventLogger` will be associated with the Schema URL, provided that
-the emitted data format is capable of representing such association.
+The term *identical* applied to `EventLogger`s describes instances where all
+parameters are equal. The term *distinct* applied to `EventLogger`s describes
+instances where at least one parameter has a different value.
 
 ## EventLogger
 

specification/metrics/api.md

@@ -120,7 +120,7 @@ The `MeterProvider` MUST provide the following functions:
 
 This API MUST accept the following parameters:
 
-* `name`: This name uniquely identifies the [instrumentation
+* `name`: Specifies the name of the [instrumentation
   scope](../glossary.md#instrumentation-scope), such as the
   [instrumentation library](../glossary.md#instrumentation-library) (e.g.
   `io.opentelemetry.contrib.mongodb`), package,
@@ -149,15 +149,9 @@ This API MUST accept the following parameters:
   it is up to their discretion. Therefore, this API MUST be structured to
   accept a variable number of attributes, including none.
 
-Meters are identified by `name`, `version`, and `schema_url` fields.  When more
-than one `Meter` of the same `name`, `version`, and `schema_url` is created, it
-is unspecified whether or under which conditions the same or different `Meter`
-instances are returned. It is a user error to create Meters with different
-attributes but the same identity.
-
-The term *identical* applied to Meters describes instances where all identifying
-fields are equal. The term *distinct* applied to Meters describes instances where
-at least one identifying field has a different value.
+The term *identical* applied to Meters describes instances where all parameters
+are equal. The term *distinct* applied to Meters describes instances where at
+least one parameter has a different value.
 
 ## Meter
 

specification/metrics/sdk.md

@@ -128,10 +128,6 @@ working Meter MUST be returned as a fallback rather than returning null or
 throwing an exception, its `name` SHOULD keep the original invalid value, and a
 message reporting that the specified value is invalid SHOULD be logged.
 
-When a Schema URL is passed as an argument when creating a `Meter` the emitted
-telemetry for that `Meter` MUST be associated with the Schema URL, provided
-that the emitted data format is capable of representing such association.
-
 **Status**: [Development](../document-status.md) - The `MeterProvider` MUST
 compute the relevant [MeterConfig](#meterconfig) using the
 configured [MeterConfigurator](#meterconfigurator), and create

specification/trace/api.md

@@ -138,15 +138,9 @@ This API MUST accept the following parameters:
 - [since 1.13.0] `attributes` (optional): Specifies the instrumentation scope attributes
   to associate with emitted telemetry.
 
-Tracers are identified by `name`, `version`, and `schema_url` fields.  When more
-than one `Tracer` of the same `name`, `version`, and `schema_url` is created, it
-is unspecified whether or under which conditions the same or different `Tracer`
-instances are returned. It is a user error to create Tracers with different
-attributes but the same identity.
-
-The term *identical* applied to Tracers describes instances where all
-identifying fields are equal. The term *distinct* applied to Tracers describes
-instances where at least one identifying field has a different value.
+The term *identical* applied to Tracers describes instances where all parameters
+are equal. The term *distinct* applied to Tracers describes instances where at
+least one parameter has a different value.
 
 Implementations MUST NOT require users to repeatedly obtain a `Tracer` again
 with the same identity to pick up configuration changes. This can be
@@ -161,11 +155,6 @@ the tracer could, for example, do a look-up with its identity in a map
 in the `TracerProvider`, or the `TracerProvider` could maintain a registry of
 all returned `Tracer`s and actively update their configuration if it changes.
 
-The effect of associating a Schema URL with a `Tracer` MUST be that the
-telemetry emitted using the `Tracer` will be associated with the Schema URL,
-provided that the emitted data format is capable of representing such
-association.
-
 ## Context Interaction
 
 This section defines all operations within the Tracing API that interact with the