[service] implement a noop tracer provider

.chloggen/codeboten_noop-providers.yaml

@@ -0,0 +1,28 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. otlpreceiver)
+component: service
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: implement a no-op tracer provider that doesn't propagate the context
+
+# One or more tracking issues or pull requests related to the change
+issues: [11026]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext: |
+  The no-op tracer provider supported by the SDK incurs a memory cost of propagating the context no matter
+  what. This is not needed if tracing is not enabled in the Collector. This implementation of the no-op tracer
+  provider removes the need to allocate memory when tracing is disabled.
+
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

service/telemetry/tracer.go

@@ -13,6 +13,7 @@
 	"go.opentelemetry.io/otel/propagation"
 	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
 	"go.opentelemetry.io/otel/trace"
+	"go.opentelemetry.io/otel/trace/embedded"
 	"go.opentelemetry.io/otel/trace/noop"
 
 	"go.opentelemetry.io/collector/config/configtelemetry"
@@ -47,10 +48,28 @@
 	return attrs
 }
 
+type noopNoContextTracer struct {
+	embedded.Tracer
+}
+
+var noopSpan = noop.Span{}
+
+func (n *noopNoContextTracer) Start(ctx context.Context, _ string, _ ...trace.SpanStartOption) (context.Context, trace.Span) {
+	return ctx, noopSpan
+}
+
+type noopNoContextTracerProvider struct {
+	embedded.TracerProvider
+}
+
+func (n *noopNoContextTracerProvider) Tracer(_ string, _ ...trace.TracerOption) trace.Tracer {
+	return &noopNoContextTracer{}
+}
+
 // New creates a new Telemetry from Config.
 func newTracerProvider(ctx context.Context, set Settings, cfg Config) (trace.TracerProvider, error) {
 	if globalgates.NoopTracerProvider.IsEnabled() || cfg.Traces.Level == configtelemetry.LevelNone {
-		return noop.NewTracerProvider(), nil
+		return &noopNoContextTracerProvider{}, nil
 	}
 
 	sch := semconv.SchemaURL

service/telemetry/tracer_test.go

@@ -9,7 +9,6 @@ import (
 
 	"github.com/stretchr/testify/require"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
-	"go.opentelemetry.io/otel/trace/noop"
 
 	"go.opentelemetry.io/collector/component"
 	"go.opentelemetry.io/collector/config/configtelemetry"
@@ -76,13 +75,13 @@ func TestNewTracerProvider(t *testing.T) {
 					Level: configtelemetry.LevelNone,
 				},
 			},
-			wantTracerProvider: noop.TracerProvider{},
+			wantTracerProvider: &noopNoContextTracerProvider{},
 		},
 		{
 			name:               "noop tracer feature gate",
 			cfg:                Config{},
 			noopTracerGate:     true,
-			wantTracerProvider: noop.TracerProvider{},
+			wantTracerProvider: &noopNoContextTracerProvider{},
 		},
 		{
 			name:               "tracer provider",