Add instrumentation scope attributes (open-telemetry#3131)

* Add WithScopeAttributes TracerOption to trace API

* Add Attributes field to instrumentation Scope

* Use scope attributes for new Tracer

* Fix stdouttrace expected test output

* Allow unexported Set fields in sdk/trace test

* Export instrumentation scope attrs in OTLP

* Add changes to the changelog

* Fix imports with make lint

* Add unit tests for WithScopeAttributes

* Fix English in Scope documentation

CHANGELOG.md

@@ -13,6 +13,8 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Support Go 1.19.
   Include compatibility testing and document support. (#3077)
 - Upgrade go.opentelemetry.io/proto/otlp from v0.18.0 to v0.19.0 (#3107)
+- Add an `Attribute` field to the `Scope` type in `go.opentelemetry.io/otel/sdk/instrumentation`. (#3131)
+- Add the `WithScopeAttributes` `TracerOption` to the `go.opentelemetry.io/otel/trace` package. (#3131)
 
 ### Changed
 
@@ -21,6 +23,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
   exact upper-inclusive boundary support following the [corresponding
   specification change](https://github.com/open-telemetry/opentelemetry-specification/pull/2633). (#2982)
 - Attempting to start a span with a nil `context` will no longer cause a panic. (#3110)
+- Export scope attributes for all exporters provided by `go.opentelemetry.io/otel/exporters/otlp/otlptrace`. (#3131)
 
 ## [1.9.0/0.0.3] - 2022-08-01
 

exporters/otlp/otlptrace/internal/tracetransform/instrumentation.go

@@ -24,7 +24,8 @@ func InstrumentationScope(il instrumentation.Scope) *commonpb.InstrumentationSco
 		return nil
 	}
 	return &commonpb.InstrumentationScope{
-		Name:    il.Name,
-		Version: il.Version,
+		Name:       il.Name,
+		Version:    il.Version,
+		Attributes: Iterator(il.Attributes.Iter()),
 	}
 }

exporters/otlp/otlptrace/internal/tracetransform/instrumentation_test.go

@@ -0,0 +1,52 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tracetransform // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/tracetransform"
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/sdk/instrumentation"
+	commonpb "go.opentelemetry.io/proto/otlp/common/v1"
+)
+
+func TestInstrumentationScope(t *testing.T) {
+	t.Run("Empty", func(t *testing.T) {
+		assert.Nil(t, InstrumentationScope(instrumentation.Scope{}))
+	})
+
+	t.Run("Mapping", func(t *testing.T) {
+		var (
+			name    = "instrumentation name"
+			version = "v0.1.0"
+			attr    = attribute.NewSet(attribute.String("domain", "trace"))
+			attrPb  = Iterator(attr.Iter())
+		)
+		expected := &commonpb.InstrumentationScope{
+			Name:       name,
+			Version:    version,
+			Attributes: attrPb,
+		}
+		actual := InstrumentationScope(instrumentation.Scope{
+			Name:       name,
+			Version:    version,
+			SchemaURL:  "http://this.is.mapped.elsewhere.com",
+			Attributes: attr,
+		})
+		assert.Equal(t, expected, actual)
+	})
+}

exporters/stdout/stdouttrace/trace_test.go

@@ -186,7 +186,8 @@ func expectedJSON(now time.Time) string {
 	"InstrumentationLibrary": {
 		"Name": "",
 		"Version": "",
-		"SchemaURL": ""
+		"SchemaURL": "",
+		"Attributes": null
 	}
 }
 `

sdk/instrumentation/scope.go

@@ -14,7 +14,14 @@
 
 package instrumentation // import "go.opentelemetry.io/otel/sdk/instrumentation"
 
-// Scope represents the instrumentation scope.
+import "go.opentelemetry.io/otel/attribute"
+
+// Scope represents the instrumentation source of OpenTelemetry data.
+//
+// Code that uses OpenTelemetry APIs or data-models to produce telemetry needs
+// to be identifiable by the receiver of that data. A Scope is used for this
+// purpose, it uniquely identifies that code as the source and the extent to
+// which it is relevant.
 type Scope struct {
 	// Name is the name of the instrumentation scope. This should be the
 	// Go package name of that scope.
@@ -23,4 +30,13 @@ type Scope struct {
 	Version string
 	// SchemaURL of the telemetry emitted by the scope.
 	SchemaURL string
+	// Attributes describe the unique attributes of an instrumentation scope.
+	//
+	// These attributes are used to differentiate an instrumentation scope when
+	// it emits data that belong to different domains. For example, if both
+	// profiling data and client-side data are emitted as log records from the
+	// same instrumentation library, they may need to be differentiated by a
+	// telemetry receiver. In that case, these attributes are used to scope and
+	// differentiate the data.
+	Attributes attribute.Set
 }

sdk/trace/provider.go

@@ -142,9 +142,10 @@ func (p *TracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 		name = defaultTracerName
 	}
 	is := instrumentation.Scope{
-		Name:      name,
-		Version:   c.InstrumentationVersion(),
-		SchemaURL: c.SchemaURL(),
+		Name:       name,
+		Version:    c.InstrumentationVersion(),
+		SchemaURL:  c.SchemaURL(),
+		Attributes: c.Attributes(),
 	}
 	t, ok := p.namedTracer[is]
 	if !ok {
@@ -153,7 +154,13 @@ func (p *TracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 			instrumentationScope: is,
 		}
 		p.namedTracer[is] = t
-		global.Info("Tracer created", "name", name, "version", c.InstrumentationVersion(), "schemaURL", c.SchemaURL())
+		global.Info(
+			"Tracer created",
+			"name", name,
+			"version", c.InstrumentationVersion(),
+			"schemaURL", c.SchemaURL(),
+			"attributes", c.Attributes(),
+		)
 	}
 	return t
 }

sdk/trace/trace_test.go

@@ -911,6 +911,8 @@ func TestSetSpanStatusWithoutMessageWhenStatusIsNotError(t *testing.T) {
 func cmpDiff(x, y interface{}) string {
 	return cmp.Diff(x, y,
 		cmp.AllowUnexported(snapshot{}),
+		cmp.AllowUnexported(attribute.Set{}),
+		cmp.AllowUnexported(attribute.Distinct{}),
 		cmp.AllowUnexported(attribute.Value{}),
 		cmp.AllowUnexported(Event{}),
 		cmp.AllowUnexported(trace.TraceState{}))

trace/config.go

@@ -24,7 +24,8 @@ import (
 type TracerConfig struct {
 	instrumentationVersion string
 	// Schema URL of the telemetry emitted by the Tracer.
-	schemaURL string
+	schemaURL  string
+	attributes attribute.Set
 }
 
 // InstrumentationVersion returns the version of the library providing instrumentation.
@@ -37,6 +38,11 @@ func (t *TracerConfig) SchemaURL() string {
 	return t.schemaURL
 }
 
+// Attributes returns the scope attribute set of the Tracer.
+func (t *TracerConfig) Attributes() attribute.Set {
+	return t.attributes
+}
+
 // NewTracerConfig applies all the options to a returned TracerConfig.
 func NewTracerConfig(options ...TracerOption) TracerConfig {
 	var config TracerConfig
@@ -314,3 +320,13 @@ func WithSchemaURL(schemaURL string) TracerOption {
 		return cfg
 	})
 }
+
+// WithScopeAttributes sets the attributes for the scope of a Tracer. The
+// attributes are stored as an attribute set. Duplicate values are removed, the
+// last value is used.
+func WithScopeAttributes(attr ...attribute.KeyValue) TracerOption {
+	return tracerOptionFunc(func(cfg TracerConfig) TracerConfig {
+		cfg.attributes = attribute.NewSet(attr...)
+		return cfg
+	})
+}

trace/config_test.go

@@ -211,6 +211,7 @@ func TestTracerConfig(t *testing.T) {
 	v1 := "semver:0.0.1"
 	v2 := "semver:1.0.0"
 	schemaURL := "https://opentelemetry.io/schemas/1.2.0"
+	one, two := attribute.Int("key", 1), attribute.Int("key", 2)
 	tests := []struct {
 		options  []TracerOption
 		expected TracerConfig
@@ -246,6 +247,24 @@ func TestTracerConfig(t *testing.T) {
 				schemaURL: schemaURL,
 			},
 		},
+
+		{
+			[]TracerOption{
+				WithScopeAttributes(one, two),
+			},
+			TracerConfig{
+				attributes: attribute.NewSet(two),
+			},
+		},
+		{
+			[]TracerOption{
+				WithScopeAttributes(two),
+				WithScopeAttributes(one),
+			},
+			TracerConfig{
+				attributes: attribute.NewSet(one),
+			},
+		},
 	}
 	for _, test := range tests {
 		config := NewTracerConfig(test.options...)