GH-935 - Migrate to Micrometer Tracings's local service name.

spring-modulith-observability/pom.xml

@@ -83,12 +83,6 @@
 			<optional>true</optional>
 		</dependency>
 
-		<dependency>
-			<groupId>io.zipkin.brave</groupId>
-			<artifactId>brave</artifactId>
-			<optional>true</optional>
-		</dependency>
-
 		<dependency>
 			<groupId>io.opentelemetry</groupId>
 			<artifactId>opentelemetry-api</artifactId>
@@ -120,6 +114,12 @@
 			<artifactId>spring-rabbit</artifactId>
 			<scope>test</scope>
 		</dependency>
+		
+		<dependency>
+			<groupId>io.zipkin.brave</groupId>
+			<artifactId>brave</artifactId>
+			<scope>test</scope>
+		</dependency>
 
 	</dependencies>
 

spring-modulith-observability/src/main/java/org/springframework/modulith/observability/LocalServiceRenamingSpanFilter.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 2025 the original author or 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
+ *
+ *      https://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 org.springframework.modulith.observability;
+
+import io.micrometer.tracing.exporter.FinishedSpan;
+import io.micrometer.tracing.exporter.SpanFilter;
+
+/**
+ * {@link SpanFilter} that sets a local service name according to the current module's name.
+ *
+ * @author Marcin Grzejszczak
+ * @since 1.4
+ */
+public class LocalServiceRenamingSpanFilter implements SpanFilter {
+
+	/*
+	 * (non-Javadoc)
+	 * @see io.micrometer.tracing.exporter.SpanFilter#map(io.micrometer.tracing.exporter.FinishedSpan)
+	 */
+	@Override
+	public FinishedSpan map(FinishedSpan span) {
+
+		String moduleKey = span.getTags().get(ModulithObservations.LowKeys.MODULE_KEY.asString());
+
+		if (moduleKey != null) {
+			span.setLocalServiceName(moduleKey);
+		}
+
+		return span;
+	}
+}

spring-modulith-observability/src/main/java/org/springframework/modulith/observability/autoconfigure/ModuleObservabilityAutoConfiguration.java

@@ -15,16 +15,12 @@
  */
 package org.springframework.modulith.observability.autoconfigure;
 
-import brave.handler.MutableSpan;
-import brave.handler.SpanHandler;
-import brave.propagation.TraceContext;
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.observation.ObservationFilter;
 import io.micrometer.observation.ObservationRegistry;
 
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnThreading;
 import org.springframework.boot.autoconfigure.thread.Threading;
@@ -34,6 +30,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.env.Environment;
 import org.springframework.core.task.support.ContextPropagatingTaskDecorator;
+import org.springframework.modulith.observability.LocalServiceRenamingSpanFilter;
 import org.springframework.modulith.observability.ModuleEventListener;
 import org.springframework.modulith.observability.ModuleObservabilityBeanPostProcessor;
 import org.springframework.modulith.observability.ModulePassingObservationFilter;
@@ -76,26 +73,9 @@ class ModuleObservabilityAutoConfiguration {
 		return new ModulePassingObservationFilter();
 	}
 
-	@Configuration(proxyBeanMethods = false)
-	@ConditionalOnClass(SpanHandler.class)
-	static class BraveConfiguration {
-		/**
-		 * Corresponds to {@link ModulithObservations.LowKeys#MODULE_KEY}
-		 */
-		private static final String MODULE_KEY_TAG_NAME = "module.key";
-
-		@Bean
-		SpanHandler localServiceNameRenamingSpanHandler() {
-			return new SpanHandler() {
-				@Override public boolean end(TraceContext context, MutableSpan span, Cause cause) {
-					String tag = span.tag(MODULE_KEY_TAG_NAME);
-					if (tag != null) {
-						span.localServiceName(tag);
-					}
-					return super.end(context, span, cause);
-				}
-			};
-		}
+	@Bean
+	LocalServiceRenamingSpanFilter localServiceRenamingSpanFilter() {
+		return new LocalServiceRenamingSpanFilter();
 	}
 
 }