Semantic conventions auto-configuration

Create beans for the conventions that will be picked up by other auto-configuration.
Adds a property to control which set of conventions are auto-configured, which makes this easier to configure consistently across applications.

module/spring-boot-micrometer-metrics/src/main/java/org/springframework/boot/micrometer/metrics/autoconfigure/SemanticConventionAutoConfiguration.java

@@ -0,0 +1,115 @@
+/*
+ * Copyright 2012-present 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.boot.micrometer.metrics.autoconfigure;
+
+import io.micrometer.core.instrument.Tags;
+import io.micrometer.core.instrument.binder.jvm.convention.JvmClassLoadingMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.JvmCpuMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.JvmMemoryMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.JvmThreadMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.micrometer.MicrometerJvmClassLoadingMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.micrometer.MicrometerJvmCpuMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.micrometer.MicrometerJvmMemoryMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.micrometer.MicrometerJvmThreadMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.otel.OpenTelemetryJvmClassLoadingMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.otel.OpenTelemetryJvmCpuMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.otel.OpenTelemetryJvmMemoryMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.otel.OpenTelemetryJvmThreadMeterConventions;
+
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.micrometer.metrics.autoconfigure.jvm.JvmMetricsAutoConfiguration;
+import org.springframework.boot.micrometer.metrics.autoconfigure.system.SystemMetricsAutoConfiguration;
+import org.springframework.boot.micrometer.observation.autoconfigure.ObservationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * {@link EnableAutoConfiguration Auto-configuration} for semantic conventions for metrics
+ * and observations.
+ *
+ * @since 4.1.0
+ */
+@AutoConfiguration(before = { JvmMetricsAutoConfiguration.class, SystemMetricsAutoConfiguration.class })
+@EnableConfigurationProperties(ObservationProperties.class)
+public final class SemanticConventionAutoConfiguration {
+
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnProperty(prefix = "management.observations", name = "conventions", havingValue = "micrometer",
+			matchIfMissing = true)
+	static class MicrometerSemanticConventionConfiguration {
+
+		@Bean
+		@ConditionalOnMissingBean(JvmMemoryMeterConventions.class)
+		MicrometerJvmMemoryMeterConventions micrometerJvmMemoryMeterConventions() {
+			return new MicrometerJvmMemoryMeterConventions();
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(JvmClassLoadingMeterConventions.class)
+		MicrometerJvmClassLoadingMeterConventions micrometerJvmClassLoadingMeterConventions() {
+			return new MicrometerJvmClassLoadingMeterConventions();
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(JvmCpuMeterConventions.class)
+		MicrometerJvmCpuMeterConventions micrometerJvmCpuMeterConventions() {
+			return new MicrometerJvmCpuMeterConventions(Tags.empty());
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(JvmThreadMeterConventions.class)
+		MicrometerJvmThreadMeterConventions micrometerJvmThreadMeterConventions() {
+			return new MicrometerJvmThreadMeterConventions(Tags.empty());
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	@ConditionalOnProperty(prefix = "management.observations", name = "conventions", havingValue = "opentelemetry")
+	static class OpenTelemetrySemanticConventionConfiguration {
+
+		@Bean
+		@ConditionalOnMissingBean(JvmMemoryMeterConventions.class)
+		OpenTelemetryJvmMemoryMeterConventions openTelemetryJvmMemoryMeterConventions() {
+			return new OpenTelemetryJvmMemoryMeterConventions(Tags.empty());
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(JvmClassLoadingMeterConventions.class)
+		OpenTelemetryJvmClassLoadingMeterConventions openTelemetryJvmClassLoadingMeterConventions() {
+			return new OpenTelemetryJvmClassLoadingMeterConventions();
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(JvmCpuMeterConventions.class)
+		OpenTelemetryJvmCpuMeterConventions openTelemetryJvmCpuMeterConventions() {
+			return new OpenTelemetryJvmCpuMeterConventions(Tags.empty());
+		}
+
+		@Bean
+		@ConditionalOnMissingBean(JvmThreadMeterConventions.class)
+		OpenTelemetryJvmThreadMeterConventions openTelemetryJvmThreadMeterConventions() {
+			return new OpenTelemetryJvmThreadMeterConventions(Tags.empty());
+		}
+
+	}
+
+}

module/spring-boot-micrometer-metrics/src/test/java/org/springframework/boot/micrometer/metrics/autoconfigure/SemanticConventionAutoConfigurationTests.java

@@ -0,0 +1,158 @@
+/*
+ * Copyright 2012-present 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.boot.micrometer.metrics.autoconfigure;
+
+import java.lang.management.MemoryPoolMXBean;
+
+import io.micrometer.core.instrument.binder.MeterConvention;
+import io.micrometer.core.instrument.binder.SimpleMeterConvention;
+import io.micrometer.core.instrument.binder.jvm.convention.JvmClassLoadingMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.JvmCpuMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.JvmMemoryMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.JvmThreadMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.micrometer.MicrometerJvmClassLoadingMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.micrometer.MicrometerJvmCpuMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.micrometer.MicrometerJvmMemoryMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.micrometer.MicrometerJvmThreadMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.otel.OpenTelemetryJvmClassLoadingMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.otel.OpenTelemetryJvmCpuMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.otel.OpenTelemetryJvmMemoryMeterConventions;
+import io.micrometer.core.instrument.binder.jvm.convention.otel.OpenTelemetryJvmThreadMeterConventions;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link SemanticConventionAutoConfiguration}.
+ */
+class SemanticConventionAutoConfigurationTests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+		.withConfiguration(AutoConfigurations.of(SemanticConventionAutoConfiguration.class));
+
+	@Test
+	void registersMicrometerConventionsByDefault() {
+		this.contextRunner.run((context) -> {
+			assertThat(context).hasSingleBean(MicrometerJvmMemoryMeterConventions.class);
+			assertThat(context).hasSingleBean(MicrometerJvmClassLoadingMeterConventions.class);
+			assertThat(context).hasSingleBean(MicrometerJvmCpuMeterConventions.class);
+			assertThat(context).hasSingleBean(MicrometerJvmThreadMeterConventions.class);
+			assertThat(context).doesNotHaveBean(OpenTelemetryJvmMemoryMeterConventions.class);
+			assertThat(context).doesNotHaveBean(OpenTelemetryJvmClassLoadingMeterConventions.class);
+			assertThat(context).doesNotHaveBean(OpenTelemetryJvmCpuMeterConventions.class);
+			assertThat(context).doesNotHaveBean(OpenTelemetryJvmThreadMeterConventions.class);
+		});
+	}
+
+	@Test
+	void registersOpenTelemetryConventionsWhenConventionsSetToOpenTelemetry() {
+		this.contextRunner.withPropertyValues("management.observations.conventions=opentelemetry").run((context) -> {
+			assertThat(context).hasSingleBean(JvmMemoryMeterConventions.class)
+				.hasSingleBean(OpenTelemetryJvmMemoryMeterConventions.class);
+			assertThat(context).hasSingleBean(JvmClassLoadingMeterConventions.class)
+				.hasSingleBean(OpenTelemetryJvmClassLoadingMeterConventions.class);
+			assertThat(context).hasSingleBean(JvmCpuMeterConventions.class)
+				.hasSingleBean(OpenTelemetryJvmCpuMeterConventions.class);
+			assertThat(context).hasSingleBean(JvmThreadMeterConventions.class)
+				.hasSingleBean(OpenTelemetryJvmThreadMeterConventions.class);
+		});
+	}
+
+	@Test
+	void allowsCustomMicrometerConventionsToBeUsed() {
+		this.contextRunner.withPropertyValues("management.observations.conventions=micrometer")
+			.withUserConfiguration(CustomJvmMemoryMeterConventionsConfiguration.class)
+			.run((context) -> {
+				assertThat(context).hasSingleBean(JvmMemoryMeterConventions.class)
+					.hasBean("customJvmMemoryMeterConventions");
+				assertThat(context).doesNotHaveBean(MicrometerJvmMemoryMeterConventions.class);
+				assertThat(context).hasSingleBean(MicrometerJvmClassLoadingMeterConventions.class);
+				assertThat(context).hasSingleBean(MicrometerJvmCpuMeterConventions.class);
+				assertThat(context).hasSingleBean(MicrometerJvmThreadMeterConventions.class);
+			});
+	}
+
+	@Test
+	void allowsCustomOpenTelemetryConventionsToBeUsed() {
+		this.contextRunner.withPropertyValues("management.observations.conventions=opentelemetry")
+			.withUserConfiguration(CustomJvmClassLoadingMeterConventionsConfiguration.class)
+			.run((context) -> {
+				assertThat(context).hasSingleBean(JvmClassLoadingMeterConventions.class)
+					.hasBean("customJvmClassLoadingMeterConventions");
+				assertThat(context).doesNotHaveBean(MicrometerJvmClassLoadingMeterConventions.class);
+				assertThat(context).hasSingleBean(OpenTelemetryJvmMemoryMeterConventions.class);
+				assertThat(context).hasSingleBean(OpenTelemetryJvmCpuMeterConventions.class);
+				assertThat(context).hasSingleBean(OpenTelemetryJvmThreadMeterConventions.class);
+			});
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class CustomJvmMemoryMeterConventionsConfiguration {
+
+		@Bean
+		JvmMemoryMeterConventions customJvmMemoryMeterConventions() {
+			return new JvmMemoryMeterConventions() {
+				@Override
+				public MeterConvention<MemoryPoolMXBean> getMemoryUsedConvention() {
+					return new SimpleMeterConvention<>("my.memory.used");
+				}
+
+				@Override
+				public MeterConvention<MemoryPoolMXBean> getMemoryCommittedConvention() {
+					return new SimpleMeterConvention<>("my.memory.committed");
+				}
+
+				@Override
+				public MeterConvention<MemoryPoolMXBean> getMemoryMaxConvention() {
+					return new SimpleMeterConvention<>("my.memory.max");
+				}
+			};
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class CustomJvmClassLoadingMeterConventionsConfiguration {
+
+		@Bean
+		JvmClassLoadingMeterConventions customJvmClassLoadingMeterConventions() {
+			return new JvmClassLoadingMeterConventions() {
+				@Override
+				public MeterConvention<Object> loadedConvention() {
+					return new SimpleMeterConvention<>("my.classes.loaded");
+				}
+
+				@Override
+				public MeterConvention<Object> unloadedConvention() {
+					return new SimpleMeterConvention<>("my.classes.unloaded");
+				}
+
+				@Override
+				public MeterConvention<Object> currentClassCountConvention() {
+					return new SimpleMeterConvention<>("my.classes.current");
+				}
+			};
+		}
+
+	}
+
+}

module/spring-boot-micrometer-observation/src/main/java/org/springframework/boot/micrometer/observation/autoconfigure/ObservationProperties.java

@@ -45,6 +45,8 @@ public class ObservationProperties {
 	 */
 	private Map<String, Boolean> enable = new LinkedHashMap<>();
 
+	private ConventionsVariant conventions = ConventionsVariant.MICROMETER;
+
 	public Map<String, Boolean> getEnable() {
 		return this.enable;
 	}
@@ -65,6 +67,20 @@ public class ObservationProperties {
 		this.keyValues = keyValues;
 	}
 
+	public ConventionsVariant getConventions() {
+		return this.conventions;
+	}
+
+	public void setConventions(ConventionsVariant conventions) {
+		this.conventions = conventions;
+	}
+
+	public enum ConventionsVariant {
+
+		OPENTELEMETRY, MICROMETER,
+
+	}
+
 	public static class Http {
 
 		private final Client client = new Client();

module/spring-boot-webmvc/src/main/java/org/springframework/boot/webmvc/autoconfigure/WebMvcObservationAutoConfiguration.java

@@ -21,12 +21,13 @@ import io.micrometer.observation.Observation;
 import io.micrometer.observation.ObservationRegistry;
 import jakarta.servlet.DispatcherType;
 
-import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingFilterBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication.Type;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
@@ -39,6 +40,7 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.core.Ordered;
 import org.springframework.core.annotation.Order;
 import org.springframework.http.server.observation.DefaultServerRequestObservationConvention;
+import org.springframework.http.server.observation.OpenTelemetryServerRequestObservationConvention;
 import org.springframework.http.server.observation.ServerRequestObservationConvention;
 import org.springframework.web.filter.ServerHttpObservationFilter;
 import org.springframework.web.servlet.DispatcherServlet;
@@ -64,13 +66,26 @@ import org.springframework.web.servlet.DispatcherServlet;
 public final class WebMvcObservationAutoConfiguration {
 
 	@Bean
-	@ConditionalOnMissingFilterBean
-	FilterRegistrationBean<ServerHttpObservationFilter> webMvcObservationFilter(ObservationRegistry registry,
-			ObjectProvider<ServerRequestObservationConvention> customConvention,
+	@ConditionalOnMissingBean(ServerRequestObservationConvention.class)
+	@ConditionalOnProperty(name = "management.observations.conventions", havingValue = "micrometer",
+			matchIfMissing = true)
+	DefaultServerRequestObservationConvention micrometerServerRequestObservationConvention(
 			ObservationProperties observationProperties) {
 		String name = observationProperties.getHttp().getServer().getRequests().getName();
-		ServerRequestObservationConvention convention = customConvention
-			.getIfAvailable(() -> new DefaultServerRequestObservationConvention(name));
+		return new DefaultServerRequestObservationConvention(name);
+	}
+
+	@Bean
+	@ConditionalOnMissingBean(ServerRequestObservationConvention.class)
+	@ConditionalOnProperty(name = "management.observations.conventions", havingValue = "opentelemetry")
+	OpenTelemetryServerRequestObservationConvention openTelemetryServerRequestObservationConvention() {
+		return new OpenTelemetryServerRequestObservationConvention();
+	}
+
+	@Bean
+	@ConditionalOnMissingFilterBean
+	FilterRegistrationBean<ServerHttpObservationFilter> webMvcObservationFilter(ObservationRegistry registry,
+			ServerRequestObservationConvention convention) {
 		ServerHttpObservationFilter filter = new ServerHttpObservationFilter(registry, convention);
 		FilterRegistrationBean<ServerHttpObservationFilter> registration = new FilterRegistrationBean<>(filter);
 		registration.setOrder(Ordered.HIGHEST_PRECEDENCE + 1);

module/spring-boot-webmvc/src/test/java/org/springframework/boot/webmvc/autoconfigure/WebMvcObservationAutoConfigurationTests.java

@@ -46,6 +46,7 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.core.Ordered;
 import org.springframework.http.server.observation.DefaultServerRequestObservationConvention;
+import org.springframework.http.server.observation.OpenTelemetryServerRequestObservationConvention;
 import org.springframework.test.web.servlet.assertj.MockMvcTester;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
@@ -93,6 +94,20 @@ class WebMvcObservationAutoConfigurationTests {
 		});
 	}
 
+	@Test
+	void defaultMicrometerConvention() {
+		this.contextRunner.run((context) -> {
+			assertThat(context).hasSingleBean(DefaultServerRequestObservationConvention.class);
+		});
+	}
+
+	@Test
+	void openTelemetryConventionConfiguredViaProperties() {
+		this.contextRunner.withPropertyValues("management.observations.conventions=opentelemetry").run((context) -> {
+			assertThat(context).hasSingleBean(OpenTelemetryServerRequestObservationConvention.class);
+		});
+	}
+
 	@Test
 	void customConventionWhenPresent() {
 		this.contextRunner.withUserConfiguration(CustomConventionConfiguration.class)