Make scope attributes as identifying for Tracer

CHANGELOG.md

@@ -29,6 +29,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc` now keeps the metadata already present in the context when `WithHeaders` is used. (#5892)
 - `go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc` now keeps the metadata already present in the context when `WithHeaders` is used. (#5911)
 - `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc` now keeps the metadata already present in the context when `WithHeaders` is used. (#5915)
+- Support scope attributes and make them as identifying for `Tracer` in `go.opentelemetry.io/otel` and `go.opentelemetry.io/otel/sdk/trace`. (#5924)
 
 <!-- Released section -->
 <!-- Don't change this section unless doing release -->

internal/global/trace.go

@@ -87,6 +87,7 @@ func (p *tracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 		name:    name,
 		version: c.InstrumentationVersion(),
 		schema:  c.SchemaURL(),
+		attrs:   c.InstrumentationAttributes(),
 	}
 
 	if p.tracers == nil {
@@ -102,7 +103,12 @@ func (p *tracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 	return t
 }
 
-type il struct{ name, version, schema string }
+type il struct {
+	name    string
+	version string
+	schema  string
+	attrs   attribute.Set
+}
 
 // tracer is a placeholder for a trace.Tracer.
 //

internal/global/trace_test.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 
+	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/trace"
 	"go.opentelemetry.io/otel/trace/embedded"
 	"go.opentelemetry.io/otel/trace/noop"
@@ -237,17 +238,18 @@ func TestSpanContextPropagatedWithNonRecordingSpan(t *testing.T) {
 }
 
 func TestTracerIdentity(t *testing.T) {
-	type id struct{ name, ver, url string }
+	type id struct{ name, ver, url, attr string }
 
 	ids := []id{
-		{"name-a", "version-a", "url-a"},
-		{"name-a", "version-a", "url-b"},
-		{"name-a", "version-b", "url-a"},
-		{"name-a", "version-b", "url-b"},
-		{"name-b", "version-a", "url-a"},
-		{"name-b", "version-a", "url-b"},
-		{"name-b", "version-b", "url-a"},
-		{"name-b", "version-b", "url-b"},
+		{"name-a", "version-a", "url-a", ""},
+		{"name-a", "version-a", "url-a", "attr"},
+		{"name-a", "version-a", "url-b", ""},
+		{"name-a", "version-b", "url-a", ""},
+		{"name-a", "version-b", "url-b", ""},
+		{"name-b", "version-a", "url-a", ""},
+		{"name-b", "version-a", "url-b", ""},
+		{"name-b", "version-b", "url-a", ""},
+		{"name-b", "version-b", "url-b", ""},
 	}
 
 	provider := &tracerProvider{}
@@ -256,6 +258,7 @@ func TestTracerIdentity(t *testing.T) {
 			i.name,
 			trace.WithInstrumentationVersion(i.ver),
 			trace.WithSchemaURL(i.url),
+			trace.WithInstrumentationAttributes(attribute.String("key", i.attr)),
 		)
 	}
 

sdk/trace/provider.go

@@ -139,9 +139,10 @@ 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.InstrumentationAttributes(),
 	}
 
 	t, ok := func() (trace.Tracer, bool) {
@@ -168,7 +169,7 @@ func (p *TracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 		//   slowing down all tracing consumers.
 		// - Logging code may be instrumented with tracing and deadlock because it could try
 		//   acquiring the same non-reentrant mutex.
-		global.Info("Tracer created", "name", name, "version", is.Version, "schemaURL", is.SchemaURL)
+		global.Info("Tracer created", "name", name, "version", is.Version, "schemaURL", is.SchemaURL, "attributes", is.Attributes)
 	}
 	return t
 }

sdk/trace/provider_test.go

@@ -387,7 +387,7 @@ func TestTracerProviderReturnsSameTracer(t *testing.T) {
 
 	t0, t1, t2 := p.Tracer("t0"), p.Tracer("t1"), p.Tracer("t0", trace.WithInstrumentationAttributes(attribute.String("foo", "bar")))
 	assert.NotSame(t, t0, t1)
-	assert.Same(t, t0, t2) // TODO (#3368): Change to assert.NotSame.
+	assert.NotSame(t, t0, t2)
 	assert.NotSame(t, t1, t2)
 
 	t3, t4, t5 := p.Tracer("t0"), p.Tracer("t1"), p.Tracer("t0", trace.WithInstrumentationAttributes(attribute.String("foo", "bar")))