diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithEventMetrics.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithEventMetrics.java
new file mode 100644
index 00000000..fa8baea7
--- /dev/null
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithEventMetrics.java
@@ -0,0 +1,57 @@
+/*
+ * 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.core.instrument.Counter.Builder;
+
+import java.util.function.BiConsumer;
+import java.util.function.Function;
+
+/**
+ * SPI to customize the {@link io.micrometer.core.instrument.Counter} instances created for cross-module application
+ * events.
+ *
+ * @author Oliver Drotbohm
+ * @author Marcin Grzejszczak
+ * @since 1.4
+ */
+public interface ModulithEventMetrics {
+
+	/**
+	 * Customizes a {@link io.micrometer.core.instrument.Counter.Builder} to eventually produce a
+	 * {@link io.micrometer.core.instrument.Counter} for the event of the given type. The {@link Builder} will have been
+	 * set up named after the fully-qualified type name. To customize the creation, also call
+	 * {@link #customize(Class, Function)}.
+	 *
+	 * @param <T> the type of the event.
+	 * @param type must not be {@literal null}.
+	 * @param consumer must not be {@literal null}.
+	 * @return will never be {@literal null}.
+	 * @see #customize(Class, Function)
+	 */
+	<T> ModulithEventMetrics customize(Class<T> type, BiConsumer<T, Builder> consumer);
+
+	/**
+	 * Customizes the creation of a {@link Builder} for events of the given type. The instances created will still be
+	 * subject to customizations registered via {@link #customize(Class, BiConsumer)}.
+	 *
+	 * @param <T>
+	 * @param type must not be {@literal null}.
+	 * @param factory must not be {@literal null}.
+	 * @return will never be {@literal null}.
+	 */
+	<T> ModulithEventMetrics customize(Class<T> type, Function<T, Builder> factory);
+}
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithEventMetricsCustomizer.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithEventMetricsCustomizer.java
new file mode 100644
index 00000000..969f4123
--- /dev/null
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithEventMetricsCustomizer.java
@@ -0,0 +1,32 @@
+/*
+ * 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;
+
+/**
+ * Allows customizing the metrics creation, in particular the counters created for cross-application-module events.
+ *
+ * @author Oliver Drotbohm
+ * @since 1.4
+ */
+public interface ModulithEventMetricsCustomizer {
+
+	/**
+	 * Customize the given {@link ModulithEventMetrics}.
+	 *
+	 * @param metrics will never be {@literal null}.
+	 */
+	void customize(ModulithEventMetrics metrics);
+}
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/autoconfigure/ModuleObservabilityAutoConfiguration.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/autoconfigure/ModuleObservabilityAutoConfiguration.java
index 53c15930..766b990a 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/autoconfigure/ModuleObservabilityAutoConfiguration.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/autoconfigure/ModuleObservabilityAutoConfiguration.java
@@ -30,10 +30,12 @@ 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;
+import org.springframework.modulith.observability.ModulithEventMetricsCustomizer;
+import org.springframework.modulith.observability.support.CrossModuleEventCounterFactory;
+import org.springframework.modulith.observability.support.LocalServiceRenamingSpanFilter;
+import org.springframework.modulith.observability.support.ModuleEventListener;
+import org.springframework.modulith.observability.support.ModuleObservabilityBeanPostProcessor;
+import org.springframework.modulith.observability.support.ModulePassingObservationFilter;
 import org.springframework.modulith.runtime.ApplicationModulesRuntime;
 
 /**
@@ -45,14 +47,16 @@ class ModuleObservabilityAutoConfiguration {
 
 	@Bean
 	static ModuleObservabilityBeanPostProcessor moduleTracingBeanPostProcessor(ApplicationModulesRuntime runtime,
-			ObjectProvider<ObservationRegistry> observationRegistry, ConfigurableListableBeanFactory factory, Environment environment) {
+			ObjectProvider<ObservationRegistry> observationRegistry, ConfigurableListableBeanFactory factory,
+			Environment environment) {
 		return new ModuleObservabilityBeanPostProcessor(runtime, observationRegistry::getObject, factory, environment);
 	}
 
 	@Bean
 	static ModuleEventListener tracingModuleEventListener(ApplicationModulesRuntime runtime,
-			ObjectProvider<ObservationRegistry> observationRegistry, ObjectProvider<MeterRegistry> meterRegistry) {
-		return new ModuleEventListener(runtime, observationRegistry::getObject, meterRegistry::getObject);
+			ObjectProvider<ObservationRegistry> observationRegistry, ObjectProvider<MeterRegistry> meterRegistry,
+			CrossModuleEventCounterFactory configurer) {
+		return new ModuleEventListener(runtime, observationRegistry::getObject, meterRegistry::getObject, configurer);
 	}
 
 	// TODO: Have a custom thread pool for modulith
@@ -78,4 +82,13 @@ class ModuleObservabilityAutoConfiguration {
 		return new LocalServiceRenamingSpanFilter();
 	}
 
+	@Bean
+	CrossModuleEventCounterFactory modulithEventCounterFactory(ObjectProvider<ModulithEventMetricsCustomizer> customizer) {
+
+		var factory = new CrossModuleEventCounterFactory();
+
+		customizer.stream().forEach(it -> it.customize(factory));
+
+		return factory;
+	}
 }
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/autoconfigure/SpringDataRestModuleObservabilityAutoConfiguration.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/autoconfigure/SpringDataRestModuleObservabilityAutoConfiguration.java
index bd675ac7..7c15d81d 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/autoconfigure/SpringDataRestModuleObservabilityAutoConfiguration.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/autoconfigure/SpringDataRestModuleObservabilityAutoConfiguration.java
@@ -23,7 +23,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.env.Environment;
 import org.springframework.data.rest.webmvc.RepositoryController;
-import org.springframework.modulith.observability.SpringDataRestModuleObservabilityBeanPostProcessor;
+import org.springframework.modulith.observability.support.SpringDataRestModuleObservabilityBeanPostProcessor;
 import org.springframework.modulith.runtime.ApplicationModulesRuntime;
 
 /**
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/CrossModuleEventCounterFactory.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/CrossModuleEventCounterFactory.java
new file mode 100644
index 00000000..f190815e
--- /dev/null
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/CrossModuleEventCounterFactory.java
@@ -0,0 +1,152 @@
+/*
+ * 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.support;
+
+import io.micrometer.core.instrument.Counter;
+import io.micrometer.core.instrument.Counter.Builder;
+
+import java.util.Comparator;
+import java.util.SortedSet;
+import java.util.TreeSet;
+import java.util.function.BiConsumer;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+import org.springframework.modulith.observability.ModulithEventMetrics;
+import org.springframework.util.Assert;
+
+/**
+ * A factory to create {@link Builder} instances for {@link Counter}s eventually. Target for dependency injection via
+ * the {@link ModulithEventMetricsCustomizer} interface to allow users to augment the counters with additional
+ * information.
+ *
+ * @author Oliver Drotbohm
+ * @author Marcin Grzejszczak
+ * @since 1.4
+ */
+public class CrossModuleEventCounterFactory implements ModulithEventMetrics {
+
+	private final SortedSet<ModulithMetricsCustomizer> customizers = new TreeSet<>();
+	private final SortedSet<ModulithMetricsCustomizer> creators = new TreeSet<>();
+
+	/**
+	 * Creates a {@link Builder} instance for the given event applying registered customizers.
+	 *
+	 * @param event must not be {@literal null}.
+	 * @return will never be {@literal null}.
+	 */
+	Builder createCounterBuilder(Object event) {
+
+		Assert.notNull(event, "Event must not be null!");
+
+		// Use most specific creator (default order as defined in ModulithMetricsCustomizer)
+		var creator = creators.stream()
+				.filter(it -> it.supports(event))
+				.findFirst()
+				.orElse(ModulithMetricsCustomizer.DEFAULT);
+
+		var builder = creator.createBuilder(event);
+
+		return customizers.stream()
+				.sorted(Comparator.reverseOrder()) // Inverted order (most specific last)
+				.filter(it -> it.supports(event))
+				.reduce(builder, (it, customizer) -> customizer.augment(event, it), (l, r) -> r);
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.modulith.observability.api.ModulithEventMetricsCustomizer#customize(java.lang.Class, java.util.function.Function)
+	 */
+	@SuppressWarnings("unchecked")
+	@Override
+	public <T> ModulithEventMetrics customize(Class<T> type, Function<T, Builder> factory) {
+
+		creators.add(new ModulithMetricsCustomizer(type, (Function<Object, Builder>) factory));
+		return this;
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * @see org.springframework.modulith.observability.api.ModulithEventMetricsCustomizer#customize(java.lang.Class, java.util.function.BiConsumer)
+	 */
+	@Override
+	@SuppressWarnings("unchecked")
+	public <T> CrossModuleEventCounterFactory customize(Class<T> type, BiConsumer<T, Builder> consumer) {
+
+		customizers.add(new ModulithMetricsCustomizer(type, (BiConsumer<Object, Builder>) consumer));
+		return this;
+	}
+
+	private static class ModulithMetricsCustomizer implements Comparable<ModulithMetricsCustomizer> {
+
+		private static final BiConsumer<Object, Builder> NO_OP = (event, builder) -> {};
+		private static final Function<Object, Builder> DEFAULT_FACTORY = event -> Counter
+				.builder(event.getClass().getName());
+
+		public static final ModulithMetricsCustomizer DEFAULT = new ModulithMetricsCustomizer(Object.class, NO_OP);
+
+		private final Class<?> type;
+		private final Function<Object, Builder> creator;
+		private final BiFunction<Object, Builder, Builder> customizer;
+
+		public ModulithMetricsCustomizer(Class<?> type, Function<Object, Builder> creator) {
+
+			this.type = type;
+			this.creator = creator;
+			this.customizer = (event, builder) -> builder;
+		}
+
+		public ModulithMetricsCustomizer(Class<?> type, BiConsumer<Object, Builder> creator) {
+
+			this.type = type;
+			this.creator = DEFAULT_FACTORY;
+			this.customizer = (event, builder) -> {
+				creator.accept(event, builder);
+				return builder;
+			};
+		}
+
+		public Builder createBuilder(Object event) {
+			return creator.apply(event);
+		}
+
+		public boolean supports(Object event) {
+			return type.isInstance(event);
+		}
+
+		public Builder augment(Object event, Builder builder) {
+			return customizer.apply(event, builder);
+		}
+
+		/*
+		 * (non-Javadoc)
+		 * @see java.lang.Comparable#compareTo(java.lang.Object)
+		 */
+		@Override
+		public int compareTo(ModulithMetricsCustomizer that) {
+
+			if (this.type.isAssignableFrom(that.type)) {
+				return 1;
+			}
+			if (that.type.isAssignableFrom(this.type)) {
+				return -1;
+			}
+
+			// If classes are not in the same hierarchy, sort by name for consistency
+			return this.type.getName().compareTo(that.type.getName());
+		}
+	}
+}
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/DefaultModulithObservationConvention.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/DefaultModulithObservationConvention.java
similarity index 91%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/DefaultModulithObservationConvention.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/DefaultModulithObservationConvention.java
index 031da501..ea39d9dd 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/DefaultModulithObservationConvention.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/DefaultModulithObservationConvention.java
@@ -13,12 +13,12 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.common.KeyValues;
 
-import org.springframework.modulith.observability.ModulithObservations.HighKeys;
-import org.springframework.modulith.observability.ModulithObservations.LowKeys;
+import org.springframework.modulith.observability.support.ModulithObservations.HighKeys;
+import org.springframework.modulith.observability.support.ModulithObservations.LowKeys;
 
 /**
  * Default implementation of {@link ModulithObservationConvention}.
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/DefaultObservedModule.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/DefaultObservedModule.java
similarity index 98%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/DefaultObservedModule.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/DefaultObservedModule.java
index cea0ddaa..261acc33 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/DefaultObservedModule.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/DefaultObservedModule.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import java.lang.reflect.Method;
 import java.util.Arrays;
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/LocalServiceRenamingSpanFilter.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/LocalServiceRenamingSpanFilter.java
similarity index 95%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/LocalServiceRenamingSpanFilter.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/LocalServiceRenamingSpanFilter.java
index 40cc0cf0..40a2709a 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/LocalServiceRenamingSpanFilter.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/LocalServiceRenamingSpanFilter.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.tracing.exporter.FinishedSpan;
 import io.micrometer.tracing.exporter.SpanFilter;
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleEntryInterceptor.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleEntryInterceptor.java
similarity index 97%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleEntryInterceptor.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleEntryInterceptor.java
index 9c5ac10c..1a03d6c1 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleEntryInterceptor.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleEntryInterceptor.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.observation.Observation;
 import io.micrometer.observation.Observation.Scope;
@@ -30,7 +30,7 @@ import org.slf4j.LoggerFactory;
 import org.springframework.core.env.Environment;
 import org.springframework.lang.Nullable;
 import org.springframework.modulith.core.ApplicationModuleIdentifier;
-import org.springframework.modulith.observability.ModulithObservations.LowKeys;
+import org.springframework.modulith.observability.support.ModulithObservations.LowKeys;
 import org.springframework.util.Assert;
 
 /**
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleEventListener.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleEventListener.java
similarity index 85%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleEventListener.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleEventListener.java
index ad188110..c406ed57 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleEventListener.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleEventListener.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.core.instrument.Counter;
 import io.micrometer.core.instrument.MeterRegistry;
@@ -25,7 +25,7 @@ import java.util.function.Supplier;
 import org.springframework.context.ApplicationEvent;
 import org.springframework.context.ApplicationListener;
 import org.springframework.context.PayloadApplicationEvent;
-import org.springframework.modulith.observability.ModulithObservations.Events;
+import org.springframework.modulith.observability.support.ModulithObservations.Events;
 import org.springframework.modulith.runtime.ApplicationModulesRuntime;
 import org.springframework.util.Assert;
 
@@ -37,6 +37,7 @@ public class ModuleEventListener implements ApplicationListener<ApplicationEvent
 	private final ApplicationModulesRuntime runtime;
 	private final Supplier<ObservationRegistry> observationRegistry;
 	private final Supplier<MeterRegistry> meterRegistry;
+	private final CrossModuleEventCounterFactory factory;
 
 	/**
 	 * Creates a new {@link ModuleEventListener} for the given {@link ApplicationModulesRuntime} and
@@ -45,17 +46,21 @@ public class ModuleEventListener implements ApplicationListener<ApplicationEvent
 	 * @param runtime must not be {@literal null}.
 	 * @param observationRegistrySupplier must not be {@literal null}.
 	 * @param meterRegistrySupplier must not be {@literal null}.
+	 * @param configurer must not be {@literal null}.
 	 */
 	public ModuleEventListener(ApplicationModulesRuntime runtime,
-			Supplier<ObservationRegistry> observationRegistrySupplier, Supplier<MeterRegistry> meterRegistrySupplier) {
+			Supplier<ObservationRegistry> observationRegistrySupplier, Supplier<MeterRegistry> meterRegistrySupplier,
+			CrossModuleEventCounterFactory counterFactory) {
 
 		Assert.notNull(runtime, "ApplicationModulesRuntime must not be null!");
 		Assert.notNull(observationRegistrySupplier, "ObservationRegistry must not be null!");
 		Assert.notNull(meterRegistrySupplier, "MeterRegistry must not be null!");
+		Assert.notNull(counterFactory, "ModulithEventCounterFactory must not be null!");
 
 		this.runtime = runtime;
 		this.observationRegistry = observationRegistrySupplier;
 		this.meterRegistry = meterRegistrySupplier;
+		this.factory = counterFactory;
 	}
 
 	/*
@@ -89,9 +94,11 @@ public class ModuleEventListener implements ApplicationListener<ApplicationEvent
 		if (registry != null) {
 
 			Counter.builder(ModulithMetrics.EVENTS.getName()) //
-					.tags(ModulithMetrics.LowKeys.EVENT_TYPE.name().toLowerCase(), event.getClass().getSimpleName()) //
+					.tags(ModulithMetrics.LowKeys.EVENT_TYPE.name().toLowerCase(), payloadType.getSimpleName()) //
 					.tags(ModulithMetrics.LowKeys.MODULE_NAME.name().toLowerCase(), moduleByType.getDisplayName()) //
 					.register(registry).increment();
+
+			factory.createCounterBuilder(event).register(registry).increment();
 		}
 
 		var observation = observationRegistry.get().getCurrentObservation();
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleObservabilityBeanPostProcessor.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleObservabilityBeanPostProcessor.java
similarity index 99%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleObservabilityBeanPostProcessor.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleObservabilityBeanPostProcessor.java
index 5b4f8b8e..165c6545 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleObservabilityBeanPostProcessor.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleObservabilityBeanPostProcessor.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.observation.ObservationRegistry;
 
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleObservabilitySupport.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleObservabilitySupport.java
similarity index 97%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleObservabilitySupport.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleObservabilitySupport.java
index 23b5c886..f9fc9495 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModuleObservabilitySupport.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModuleObservabilitySupport.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import java.util.function.Consumer;
 
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulePassingObservationFilter.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulePassingObservationFilter.java
similarity index 97%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulePassingObservationFilter.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulePassingObservationFilter.java
index 94d464aa..6c072417 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulePassingObservationFilter.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulePassingObservationFilter.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.observation.Observation;
 import io.micrometer.observation.Observation.ContextView;
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithContext.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithContext.java
similarity index 97%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithContext.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithContext.java
index 3b10497e..96912394 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithContext.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithContext.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.observation.Observation.Context;
 
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithMetrics.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithMetrics.java
similarity index 97%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithMetrics.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithMetrics.java
index 85910eeb..99b29e5a 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithMetrics.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithMetrics.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.common.docs.KeyName;
 import io.micrometer.core.instrument.Meter;
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithObservationConvention.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithObservationConvention.java
similarity index 95%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithObservationConvention.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithObservationConvention.java
index bb44a5ee..b81eb2a7 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithObservationConvention.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithObservationConvention.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.observation.Observation.Context;
 import io.micrometer.observation.ObservationConvention;
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithObservations.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithObservations.java
similarity index 96%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithObservations.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithObservations.java
index fa64e56a..e9c42c51 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ModulithObservations.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ModulithObservations.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.common.docs.KeyName;
 import io.micrometer.observation.Observation;
@@ -133,7 +133,7 @@ enum ModulithObservations implements ObservationDocumentation {
 			 */
 			@Override
 			public String getContextualName() {
-				return getName();
+				return "event.publication.success";
 			}
 		},
 
@@ -157,7 +157,7 @@ enum ModulithObservations implements ObservationDocumentation {
 			 */
 			@Override
 			public String getContextualName() {
-				return getName();
+				return "event.publication.failure";
 			}
 		}
 	}
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ObservedModule.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ObservedModule.java
similarity index 97%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ObservedModule.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ObservedModule.java
index c3694fd8..f5e4c42d 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ObservedModule.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ObservedModule.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import java.lang.reflect.Method;
 
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ObservedModuleType.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ObservedModuleType.java
similarity index 98%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ObservedModuleType.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ObservedModuleType.java
index 92cdb3e2..aab8f42b 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/ObservedModuleType.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/ObservedModuleType.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/SpringDataRestModuleObservabilityBeanPostProcessor.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/SpringDataRestModuleObservabilityBeanPostProcessor.java
similarity index 98%
rename from spring-modulith-observability/src/main/java/org/springframework/modulith/observability/SpringDataRestModuleObservabilityBeanPostProcessor.java
rename to spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/SpringDataRestModuleObservabilityBeanPostProcessor.java
index ea9ca9d2..2e991146 100644
--- a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/SpringDataRestModuleObservabilityBeanPostProcessor.java
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/SpringDataRestModuleObservabilityBeanPostProcessor.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import io.micrometer.observation.ObservationRegistry;
 
diff --git a/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/package-info.java b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/package-info.java
new file mode 100644
index 00000000..dcfe3c45
--- /dev/null
+++ b/spring-modulith-observability/src/main/java/org/springframework/modulith/observability/support/package-info.java
@@ -0,0 +1,5 @@
+/**
+ * Support for application module observability.
+ */
+@org.springframework.lang.NonNullApi
+package org.springframework.modulith.observability.support;
diff --git a/spring-modulith-observability/src/test/java/example/ExampleApplicationIntegrationTests.java b/spring-modulith-observability/src/test/java/example/ExampleApplicationIntegrationTests.java
index a3ac5254..b4dd2948 100644
--- a/spring-modulith-observability/src/test/java/example/ExampleApplicationIntegrationTests.java
+++ b/spring-modulith-observability/src/test/java/example/ExampleApplicationIntegrationTests.java
@@ -22,7 +22,7 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.autoconfigure.actuate.observability.AutoConfigureObservability;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.context.ApplicationContext;
-import org.springframework.modulith.observability.ModuleEventListener;
+import org.springframework.modulith.observability.support.ModuleEventListener;
 
 /**
  * @author Oliver Drotbohm
diff --git a/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/CrossModuleEventCounterFactoryUnitTests.java b/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/CrossModuleEventCounterFactoryUnitTests.java
new file mode 100644
index 00000000..aa0f3d8e
--- /dev/null
+++ b/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/CrossModuleEventCounterFactoryUnitTests.java
@@ -0,0 +1,80 @@
+/*
+ * 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.support;
+
+import static org.assertj.core.api.Assertions.*;
+
+import io.micrometer.core.instrument.Counter;
+import io.micrometer.core.instrument.Meter.Id;
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
+
+import java.util.function.Consumer;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.modulith.observability.support.CrossModuleEventCounterFactory;
+
+/**
+ * Unit tests for {@link CrossModuleEventCounterFactory}.
+ *
+ * @author Oliver Drotbohm
+ */
+class CrossModuleEventCounterFactoryUnitTests {
+
+	MeterRegistry registry = new SimpleMeterRegistry();
+	CrossModuleEventCounterFactory factory = new CrossModuleEventCounterFactory();
+
+	@Test // GH-1068
+	void appliesCustomization() {
+
+		factory.customize(SampleEvent.class, (__, builder) -> builder.tag("key", "value"));
+
+		assertCounter(new SampleEvent(), it -> {
+			assertThat(it.getName()).isEqualTo(SampleEvent.class.getName());
+			assertThat(it.getTag("key")).isNotNull();
+		});
+	}
+
+	@Test // GH-1068
+	void usesCreatorAndCustomizer() {
+
+		factory.customize(Object.class, __ -> Counter.builder("Object"));
+		factory.customize(SampleEvent.class, __ -> Counter.builder("name"));
+		factory.customize(SampleEvent.class, (__, builder) -> builder.tag("key", "value"));
+		factory.customize(Object.class, (__, builder) -> builder.tag("key", "value2"));
+		factory.customize(OtherSampleEvent.class, (__, builder) -> builder.tag("key2", "value3"));
+
+		assertCounter(new SampleEvent(), it -> {
+			assertThat(it.getName()).isEqualTo("name");
+			assertThat(it.getTag("key")).isEqualTo("value");
+			assertThat(it.getTag("key2")).isNull();
+		});
+
+		assertCounter(new OtherSampleEvent(), it -> {
+			assertThat(it.getName()).isEqualTo("Object");
+			assertThat(it.getTag("key")).isEqualTo("value2");
+			assertThat(it.getTag("key2")).isEqualTo("value3");
+		});
+	}
+
+	private void assertCounter(Object event, Consumer<Id> assertions) {
+		assertions.accept(factory.createCounterBuilder(event).register(registry).getId());
+	}
+
+	static class SampleEvent {}
+
+	static class OtherSampleEvent {}
+}
diff --git a/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/DefaultObservedModuleUnitTests.java b/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/DefaultObservedModuleUnitTests.java
similarity index 91%
rename from spring-modulith-observability/src/test/java/org/springframework/modulith/observability/DefaultObservedModuleUnitTests.java
rename to spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/DefaultObservedModuleUnitTests.java
index 5534befe..ee46fe6d 100644
--- a/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/DefaultObservedModuleUnitTests.java
+++ b/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/DefaultObservedModuleUnitTests.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import static org.assertj.core.api.Assertions.*;
 
@@ -27,6 +27,8 @@ import org.junit.jupiter.api.Test;
 import org.springframework.modulith.core.ApplicationModule;
 import org.springframework.modulith.core.ApplicationModules;
 import org.springframework.modulith.core.ArchitecturallyEvidentType;
+import org.springframework.modulith.observability.support.DefaultObservedModule;
+import org.springframework.modulith.observability.support.ObservedModule;
 import org.springframework.modulith.test.TestApplicationModules;
 
 /**
diff --git a/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/ModuleObservabilityBeanPostProcessorIntegrationTests.java b/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/ModuleObservabilityBeanPostProcessorIntegrationTests.java
similarity index 91%
rename from spring-modulith-observability/src/test/java/org/springframework/modulith/observability/ModuleObservabilityBeanPostProcessorIntegrationTests.java
rename to spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/ModuleObservabilityBeanPostProcessorIntegrationTests.java
index d9dec6cb..43f2494a 100644
--- a/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/ModuleObservabilityBeanPostProcessorIntegrationTests.java
+++ b/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/ModuleObservabilityBeanPostProcessorIntegrationTests.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import static org.assertj.core.api.Assertions.*;
 
@@ -28,7 +28,8 @@ import org.springframework.boot.SpringApplication;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.modulith.observability.ModuleObservabilityBeanPostProcessor.ApplicationModuleObservingAdvisor;
+import org.springframework.modulith.observability.support.ModuleObservabilityBeanPostProcessor;
+import org.springframework.modulith.observability.support.ModuleObservabilityBeanPostProcessor.ApplicationModuleObservingAdvisor;
 import org.springframework.modulith.runtime.ApplicationModulesRuntime;
 import org.springframework.modulith.runtime.ApplicationRuntime;
 import org.springframework.modulith.test.TestApplicationModules;
diff --git a/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/ModuleObservabilityBeanPostProcessorUnitTests.java b/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/ModuleObservabilityBeanPostProcessorUnitTests.java
similarity index 94%
rename from spring-modulith-observability/src/test/java/org/springframework/modulith/observability/ModuleObservabilityBeanPostProcessorUnitTests.java
rename to spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/ModuleObservabilityBeanPostProcessorUnitTests.java
index cfe15e40..7e8eaf25 100644
--- a/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/ModuleObservabilityBeanPostProcessorUnitTests.java
+++ b/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/ModuleObservabilityBeanPostProcessorUnitTests.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import static org.assertj.core.api.Assertions.*;
 import static org.mockito.ArgumentMatchers.*;
@@ -26,6 +26,7 @@ import org.springframework.amqp.rabbit.annotation.RabbitListenerAnnotationBeanPo
 import org.springframework.beans.factory.support.DefaultListableBeanFactory;
 import org.springframework.beans.factory.support.RootBeanDefinition;
 import org.springframework.mock.env.MockEnvironment;
+import org.springframework.modulith.observability.support.ModuleObservabilityBeanPostProcessor;
 import org.springframework.modulith.runtime.ApplicationModulesRuntime;
 
 /**
diff --git a/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/ObservedModuleTypeUnitTests.java b/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/ObservedModuleTypeUnitTests.java
similarity index 93%
rename from spring-modulith-observability/src/test/java/org/springframework/modulith/observability/ObservedModuleTypeUnitTests.java
rename to spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/ObservedModuleTypeUnitTests.java
index 91437c39..c7cbaa4c 100644
--- a/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/ObservedModuleTypeUnitTests.java
+++ b/spring-modulith-observability/src/test/java/org/springframework/modulith/observability/support/ObservedModuleTypeUnitTests.java
@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-package org.springframework.modulith.observability;
+package org.springframework.modulith.observability.support;
 
 import static org.assertj.core.api.Assertions.*;
 
@@ -26,6 +26,8 @@ import org.springframework.modulith.core.ApplicationModule;
 import org.springframework.modulith.core.ApplicationModules;
 import org.springframework.modulith.core.ArchitecturallyEvidentType;
 import org.springframework.modulith.core.Types;
+import org.springframework.modulith.observability.support.DefaultObservedModule;
+import org.springframework.modulith.observability.support.ObservedModuleType;
 import org.springframework.modulith.test.TestApplicationModules;
 import org.springframework.util.ReflectionUtils;