Back off tracing auto-configurations if tracing is disabled

See gh-31308

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/BraveAutoConfiguration.java

@@ -60,6 +60,7 @@ import org.springframework.core.env.Environment;
 @AutoConfiguration(before = MicrometerTracingAutoConfiguration.class)
 @ConditionalOnClass(brave.Tracer.class)
 @EnableConfigurationProperties(TracingProperties.class)
+@ConditionalOnEnabledTracing
 public class BraveAutoConfiguration {
 
 	/**

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/MicrometerTracingAutoConfiguration.java

@@ -40,6 +40,7 @@ import org.springframework.core.annotation.Order;
  */
 @AutoConfiguration
 @ConditionalOnClass(Tracer.class)
+@ConditionalOnEnabledTracing
 public class MicrometerTracingAutoConfiguration {
 
 	/**

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/OpenTelemetryAutoConfiguration.java

@@ -34,6 +34,7 @@ import org.springframework.context.annotation.Import;
  */
 @AutoConfiguration(before = MicrometerTracingAutoConfiguration.class)
 @Import({ SdkConfiguration.class, TracerConfiguration.class, MicrometerConfiguration.class })
+@ConditionalOnEnabledTracing
 public class OpenTelemetryAutoConfiguration {
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/wavefront/WavefrontTracingAutoConfiguration.java

@@ -30,6 +30,7 @@ import io.opentelemetry.sdk.trace.export.SpanExporter;
 
 import org.springframework.boot.actuate.autoconfigure.metrics.CompositeMeterRegistryAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.tracing.ConditionalOnEnabledTracing;
 import org.springframework.boot.actuate.autoconfigure.wavefront.WavefrontProperties;
 import org.springframework.boot.actuate.autoconfigure.wavefront.WavefrontProperties.Tracing;
 import org.springframework.boot.actuate.autoconfigure.wavefront.WavefrontSenderConfiguration;
@@ -54,6 +55,7 @@ import org.springframework.core.env.Environment;
 @EnableConfigurationProperties(WavefrontProperties.class)
 @ConditionalOnBean(WavefrontSender.class)
 @Import(WavefrontSenderConfiguration.class)
+@ConditionalOnEnabledTracing
 public class WavefrontTracingAutoConfiguration {
 
 	/**

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/zipkin/ZipkinAutoConfiguration.java

@@ -21,6 +21,7 @@ import zipkin2.codec.BytesEncoder;
 import zipkin2.codec.SpanBytesEncoder;
 import zipkin2.reporter.Sender;
 
+import org.springframework.boot.actuate.autoconfigure.tracing.ConditionalOnEnabledTracing;
 import org.springframework.boot.actuate.autoconfigure.tracing.zipkin.ZipkinConfigurations.BraveConfiguration;
 import org.springframework.boot.actuate.autoconfigure.tracing.zipkin.ZipkinConfigurations.OpenTelemetryConfiguration;
 import org.springframework.boot.actuate.autoconfigure.tracing.zipkin.ZipkinConfigurations.ReporterConfiguration;
@@ -46,6 +47,7 @@ import org.springframework.context.annotation.Import;
 @ConditionalOnClass(Sender.class)
 @Import({ SenderConfiguration.class, ReporterConfiguration.class, BraveConfiguration.class,
 		OpenTelemetryConfiguration.class })
+@ConditionalOnEnabledTracing
 public class ZipkinAutoConfiguration {
 
 	@Bean

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/BraveAutoConfigurationTests.java

@@ -138,6 +138,20 @@ class BraveAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void shouldNotSupplyBraveBeansIfTracingIsDisabled() {
+		this.contextRunner.withPropertyValues("management.tracing.enabled=false").run((context) -> {
+			assertThat(context).doesNotHaveBean(Tracing.class);
+			assertThat(context).doesNotHaveBean(Tracer.class);
+			assertThat(context).doesNotHaveBean(CurrentTraceContext.class);
+			assertThat(context).doesNotHaveBean(Factory.class);
+			assertThat(context).doesNotHaveBean(Sampler.class);
+			assertThat(context).doesNotHaveBean(HttpTracing.class);
+			assertThat(context).doesNotHaveBean(HttpServerHandler.class);
+			assertThat(context).doesNotHaveBean(HttpClientHandler.class);
+		});
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	private static class CustomBraveConfiguration {
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/MicrometerTracingAutoConfigurationTests.java

@@ -116,6 +116,18 @@ class MicrometerTracingAutoConfigurationTests {
 				.run((context) -> assertThat(context).doesNotHaveBean(HttpServerTracingObservationHandler.class));
 	}
 
+	@Test
+	void shouldNotSupplyBeansIfTracingIsDisabled() {
+		this.contextRunner
+				.withUserConfiguration(TracerConfiguration.class, HttpClientHandlerConfiguration.class,
+						HttpServerHandlerConfiguration.class)
+				.withPropertyValues("management.tracing.enabled=false").run((context) -> {
+					assertThat(context).doesNotHaveBean(DefaultTracingObservationHandler.class);
+					assertThat(context).doesNotHaveBean(HttpServerTracingObservationHandler.class);
+					assertThat(context).doesNotHaveBean(HttpClientTracingObservationHandler.class);
+				});
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	private static class TracerConfiguration {
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/wavefront/WavefrontTracingAutoConfigurationTests.java

@@ -79,6 +79,18 @@ class WavefrontTracingAutoConfigurationTests {
 				});
 	}
 
+	@Test
+	void shouldNotSupplyBeansIfTracingIsDisabled() {
+		this.contextRunner.withPropertyValues("management.tracing.enabled=false")
+				.withUserConfiguration(WavefrontSenderConfiguration.class).run((context) -> {
+					assertThat(context).doesNotHaveBean(ApplicationTags.class);
+					assertThat(context).doesNotHaveBean(WavefrontSpanHandler.class);
+					assertThat(context).doesNotHaveBean(SpanMetrics.class);
+					assertThat(context).doesNotHaveBean(WavefrontBraveSpanHandler.class);
+					assertThat(context).doesNotHaveBean(WavefrontOtelSpanHandler.class);
+				});
+	}
+
 	@Test
 	void shouldSupplyMeterRegistrySpanMetricsIfMeterRegistryIsAvailable() {
 		this.contextRunner.withUserConfiguration(WavefrontSenderConfiguration.class, MeterRegistryConfiguration.class)

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/zipkin/ZipkinAutoConfigurationTests.java

@@ -58,6 +58,12 @@ class ZipkinAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void shouldNotSupplyBeansIfTracingIsDisabled() {
+		this.contextRunner.withPropertyValues("management.tracing.enabled=false")
+				.run((context) -> assertThat(context).doesNotHaveBean(BytesEncoder.class));
+	}
+
 	@Configuration(proxyBeanMethods = false)
 	private static class CustomConfiguration {