Make scope attributes as identifying for Meter (#5926)

Towards https://github.com/open-telemetry/opentelemetry-go/issues/3368

CHANGELOG.md

@@ -30,6 +30,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - `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)
+- Support scope attributes and make them as identifying for `Meter` in `go.opentelemetry.io/otel` and `go.opentelemetry.io/otel/sdk/metric`. (#5926)
 
 <!-- Released section -->
 <!-- Don't change this section unless doing release -->

internal/global/meter.go

@@ -67,6 +67,7 @@ func (p *meterProvider) Meter(name string, opts ...metric.MeterOption) metric.Me
 		name:    name,
 		version: c.InstrumentationVersion(),
 		schema:  c.SchemaURL(),
+		attrs:   c.InstrumentationAttributes(),
 	}
 
 	if p.meters == nil {

internal/global/meter_test.go

@@ -13,6 +13,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
+	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/metric"
 	"go.opentelemetry.io/otel/metric/noop"
 )
@@ -397,17 +398,18 @@ func TestRegistrationDelegation(t *testing.T) {
 }
 
 func TestMeterIdentity(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 := &meterProvider{}
@@ -416,6 +418,7 @@ func TestMeterIdentity(t *testing.T) {
 			i.name,
 			metric.WithInstrumentationVersion(i.ver),
 			metric.WithSchemaURL(i.url),
+			metric.WithInstrumentationAttributes(attribute.String("key", i.attr)),
 		)
 	}
 

sdk/metric/provider.go

@@ -76,15 +76,17 @@ func (mp *MeterProvider) Meter(name string, options ...metric.MeterOption) metri
 
 	c := metric.NewMeterConfig(options...)
 	s := instrumentation.Scope{
-		Name:      name,
-		Version:   c.InstrumentationVersion(),
-		SchemaURL: c.SchemaURL(),
+		Name:       name,
+		Version:    c.InstrumentationVersion(),
+		SchemaURL:  c.SchemaURL(),
+		Attributes: c.InstrumentationAttributes(),
 	}
 
 	global.Info("Meter created",
 		"Name", s.Name,
 		"Version", s.Version,
 		"SchemaURL", s.SchemaURL,
+		"Attributes", s.Attributes,
 	)
 
 	return mp.meters.Lookup(s, func() *meter {

sdk/metric/provider_test.go

@@ -96,7 +96,7 @@ func TestMeterProviderReturnsSameMeter(t *testing.T) {
 
 	assert.Same(t, mtr, mp.Meter(""))
 	assert.NotSame(t, mtr, mp.Meter("diff"))
-	assert.Same(t, mtr, mp.Meter("", api.WithInstrumentationAttributes(attribute.String("k", "v")))) // TODO (#3368): Change to assert.NotSame.
+	assert.NotSame(t, mtr, mp.Meter("", api.WithInstrumentationAttributes(attribute.String("k", "v"))))
 }
 
 func TestEmptyMeterName(t *testing.T) {