Merge pull request #40961 from making

* pr/40961:
  Polish "Provide auto configuration for OpenTelemetry Logs"
  Provide auto configuration for OpenTelemetry Logs

Closes gh-40961

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/OpenTelemetryLoggingAutoConfiguration.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright 2012-2024 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.actuate.autoconfigure.logging.opentelemetry;
+
+import io.opentelemetry.api.OpenTelemetry;
+import io.opentelemetry.sdk.logs.LogRecordProcessor;
+import io.opentelemetry.sdk.logs.SdkLoggerProvider;
+import io.opentelemetry.sdk.logs.SdkLoggerProviderBuilder;
+import io.opentelemetry.sdk.logs.export.BatchLogRecordProcessor;
+import io.opentelemetry.sdk.logs.export.LogRecordExporter;
+import io.opentelemetry.sdk.resources.Resource;
+
+import org.springframework.beans.factory.ObjectProvider;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.context.annotation.Bean;
+
+/**
+ * {@link EnableAutoConfiguration Auto-configuration} for OpenTelemetry logging.
+ *
+ * @author Toshiaki Maki
+ * @since 3.4.0
+ */
+@AutoConfiguration
+@ConditionalOnClass({ SdkLoggerProvider.class, OpenTelemetry.class })
+public class OpenTelemetryLoggingAutoConfiguration {
+
+	@Bean
+	@ConditionalOnMissingBean
+	BatchLogRecordProcessor batchLogRecordProcessor(ObjectProvider<LogRecordExporter> logRecordExporters) {
+		return BatchLogRecordProcessor.builder(LogRecordExporter.composite(logRecordExporters.orderedStream().toList()))
+			.build();
+	}
+
+	@Bean
+	@ConditionalOnMissingBean
+	SdkLoggerProvider otelSdkLoggerProvider(Resource resource, ObjectProvider<LogRecordProcessor> logRecordProcessors,
+			ObjectProvider<SdkLoggerProviderBuilderCustomizer> customizers) {
+		SdkLoggerProviderBuilder builder = SdkLoggerProvider.builder().setResource(resource);
+		logRecordProcessors.orderedStream().forEach(builder::addLogRecordProcessor);
+		customizers.orderedStream().forEach((customizer) -> customizer.customize(builder));
+		return builder.build();
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/SdkLoggerProviderBuilderCustomizer.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2012-2024 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.actuate.autoconfigure.logging.opentelemetry;
+
+import io.opentelemetry.sdk.logs.SdkLoggerProvider;
+import io.opentelemetry.sdk.logs.SdkLoggerProviderBuilder;
+
+/**
+ * Callback interface that can be used to customize the {@link SdkLoggerProviderBuilder}
+ * that is used to create the auto-configured {@link SdkLoggerProvider}.
+ *
+ * @author Toshiaki Maki
+ * @since 3.4.0
+ */
+@FunctionalInterface
+public interface SdkLoggerProviderBuilderCustomizer {
+
+	/**
+	 * Customize the given {@code builder}.
+	 * @param builder the builder to customize
+	 */
+	void customize(SdkLoggerProviderBuilder builder);
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/otlp/OtlpLoggingAutoConfiguration.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2012-2024 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.actuate.autoconfigure.logging.opentelemetry.otlp;
+
+import io.opentelemetry.api.OpenTelemetry;
+import io.opentelemetry.exporter.otlp.http.logs.OtlpHttpLogRecordExporter;
+import io.opentelemetry.sdk.logs.SdkLoggerProvider;
+
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Import;
+
+/**
+ * {@link EnableAutoConfiguration Auto-configuration} for OTLP logging.
+ *
+ * @author Toshiaki Maki
+ * @since 3.4.0
+ */
+@AutoConfiguration
+@ConditionalOnClass({ SdkLoggerProvider.class, OpenTelemetry.class, OtlpHttpLogRecordExporter.class })
+@EnableConfigurationProperties(OtlpLoggingProperties.class)
+@Import({ OtlpLoggingConfigurations.ConnectionDetails.class, OtlpLoggingConfigurations.Exporters.class })
+public class OtlpLoggingAutoConfiguration {
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/otlp/OtlpLoggingConfigurations.java

@@ -0,0 +1,89 @@
+/*
+ * Copyright 2012-2024 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.actuate.autoconfigure.logging.opentelemetry.otlp;
+
+import java.util.Locale;
+
+import io.opentelemetry.exporter.otlp.http.logs.OtlpHttpLogRecordExporter;
+import io.opentelemetry.exporter.otlp.http.logs.OtlpHttpLogRecordExporterBuilder;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Configurations imported by {@link OtlpLoggingAutoConfiguration}.
+ *
+ * @author Toshiaki Maki
+ */
+final class OtlpLoggingConfigurations {
+
+	private OtlpLoggingConfigurations() {
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class ConnectionDetails {
+
+		@Bean
+		@ConditionalOnMissingBean
+		@ConditionalOnProperty(prefix = "management.otlp.logging", name = "endpoint")
+		OtlpLoggingConnectionDetails otlpLogsConnectionDetails(OtlpLoggingProperties properties) {
+			return new PropertiesOtlpLoggingConnectionDetails(properties);
+		}
+
+		/**
+		 * Adapts {@link OtlpLoggingProperties} to {@link OtlpLoggingConnectionDetails}.
+		 */
+		static class PropertiesOtlpLoggingConnectionDetails implements OtlpLoggingConnectionDetails {
+
+			private final OtlpLoggingProperties properties;
+
+			PropertiesOtlpLoggingConnectionDetails(OtlpLoggingProperties properties) {
+				this.properties = properties;
+			}
+
+			@Override
+			public String getEndpoint() {
+				return this.properties.getEndpoint();
+			}
+
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class Exporters {
+
+		@ConditionalOnMissingBean(value = OtlpHttpLogRecordExporter.class,
+				type = "io.opentelemetry.exporter.otlp.logs.OtlpGrpcLogRecordExporter")
+		@ConditionalOnBean(OtlpLoggingConnectionDetails.class)
+		@Bean
+		OtlpHttpLogRecordExporter otlpHttpLogRecordExporter(OtlpLoggingProperties properties,
+				OtlpLoggingConnectionDetails connectionDetails) {
+			OtlpHttpLogRecordExporterBuilder builder = OtlpHttpLogRecordExporter.builder()
+				.setEndpoint(connectionDetails.getEndpoint())
+				.setCompression(properties.getCompression().name().toLowerCase(Locale.US))
+				.setTimeout(properties.getTimeout());
+			properties.getHeaders().forEach(builder::addHeader);
+			return builder.build();
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/otlp/OtlpLoggingConnectionDetails.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2012-2024 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.actuate.autoconfigure.logging.opentelemetry.otlp;
+
+import org.springframework.boot.autoconfigure.service.connection.ConnectionDetails;
+
+/**
+ * Details required to establish a connection to an OpenTelemetry logging service.
+ *
+ * @author Toshiaki Maki
+ * @since 3.4.0
+ */
+public interface OtlpLoggingConnectionDetails extends ConnectionDetails {
+
+	/**
+	 * Address to where logs will be published.
+	 * @return the address to where logs will be published
+	 */
+	String getEndpoint();
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/otlp/OtlpLoggingProperties.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright 2012-2024 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.actuate.autoconfigure.logging.opentelemetry.otlp;
+
+import java.time.Duration;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+/**
+ * Configuration properties for exporting logs using OTLP.
+ *
+ * @author Jonatan Ivanov
+ * @since 3.4.0
+ */
+@ConfigurationProperties("management.otlp.logging")
+public class OtlpLoggingProperties {
+
+	/**
+	 * URL to the OTel collector's HTTP API.
+	 */
+	private String endpoint;
+
+	/**
+	 * Call timeout for the OTel Collector to process an exported batch of data. This
+	 * timeout spans the entire call: resolving DNS, connecting, writing the request body,
+	 * server processing, and reading the response body. If the call requires redirects or
+	 * retries all must complete within one timeout period.
+	 */
+	private Duration timeout = Duration.ofSeconds(10);
+
+	/**
+	 * Method used to compress the payload.
+	 */
+	private Compression compression = Compression.NONE;
+
+	/**
+	 * Custom HTTP headers you want to pass to the collector, for example auth headers.
+	 */
+	private final Map<String, String> headers = new HashMap<>();
+
+	public String getEndpoint() {
+		return this.endpoint;
+	}
+
+	public void setEndpoint(String endpoint) {
+		this.endpoint = endpoint;
+	}
+
+	public Duration getTimeout() {
+		return this.timeout;
+	}
+
+	public void setTimeout(Duration timeout) {
+		this.timeout = timeout;
+	}
+
+	public Compression getCompression() {
+		return this.compression;
+	}
+
+	public void setCompression(Compression compression) {
+		this.compression = compression;
+	}
+
+	public Map<String, String> getHeaders() {
+		return this.headers;
+	}
+
+	public enum Compression {
+
+		/**
+		 * Gzip compression.
+		 */
+		GZIP,
+
+		/**
+		 * No compression.
+		 */
+		NONE
+
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/otlp/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-2023 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.
+ */
+
+/**
+ * Auto-configuration for OpenTelemetry logging with OTLP.
+ */
+package org.springframework.boot.actuate.autoconfigure.logging.opentelemetry.otlp;

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2012-2019 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.
+ */
+
+/**
+ * Auto-configuration for OpenTelemetry logging.
+ */
+package org.springframework.boot.actuate.autoconfigure.logging.opentelemetry;

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/resources/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports

@@ -35,6 +35,8 @@ org.springframework.boot.actuate.autoconfigure.ldap.LdapHealthContributorAutoCon
 org.springframework.boot.actuate.autoconfigure.liquibase.LiquibaseEndpointAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.logging.LogFileWebEndpointAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.logging.LoggersEndpointAutoConfiguration
+org.springframework.boot.actuate.autoconfigure.logging.opentelemetry.OpenTelemetryLoggingAutoConfiguration
+org.springframework.boot.actuate.autoconfigure.logging.opentelemetry.otlp.OtlpLoggingAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.mail.MailHealthContributorAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.management.HeapDumpWebEndpointAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.management.ThreadDumpEndpointAutoConfiguration

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/OpenTelemetryLoggingAutoConfigurationTests.java

@@ -0,0 +1,226 @@
+/*
+ * Copyright 2012-2024 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.actuate.autoconfigure.logging.opentelemetry;
+
+import java.util.Collection;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import io.opentelemetry.context.Context;
+import io.opentelemetry.sdk.common.CompletableResultCode;
+import io.opentelemetry.sdk.logs.LogRecordProcessor;
+import io.opentelemetry.sdk.logs.ReadWriteLogRecord;
+import io.opentelemetry.sdk.logs.SdkLoggerProvider;
+import io.opentelemetry.sdk.logs.SdkLoggerProviderBuilder;
+import io.opentelemetry.sdk.logs.data.LogRecordData;
+import io.opentelemetry.sdk.logs.export.BatchLogRecordProcessor;
+import io.opentelemetry.sdk.logs.export.LogRecordExporter;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.FilteredClassLoader;
+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 OpenTelemetryLoggingAutoConfiguration}.
+ *
+ * @author Toshiaki Maki
+ */
+class OpenTelemetryLoggingAutoConfigurationTests {
+
+	private final ApplicationContextRunner contextRunner;
+
+	OpenTelemetryLoggingAutoConfigurationTests() {
+		this.contextRunner = new ApplicationContextRunner().withConfiguration(AutoConfigurations.of(
+				org.springframework.boot.actuate.autoconfigure.opentelemetry.OpenTelemetryAutoConfiguration.class,
+				OpenTelemetryLoggingAutoConfiguration.class));
+	}
+
+	@Test
+	void shouldSupplyBeans() {
+		this.contextRunner.run((context) -> {
+			assertThat(context).hasSingleBean(BatchLogRecordProcessor.class);
+			assertThat(context).hasSingleBean(SdkLoggerProvider.class);
+		});
+	}
+
+	@ParameterizedTest
+	@ValueSource(strings = { "io.opentelemetry.sdk.logs", "io.opentelemetry.api" })
+	void shouldNotSupplyBeansIfDependencyIsMissing(String packageName) {
+		this.contextRunner.withClassLoader(new FilteredClassLoader(packageName)).run((context) -> {
+			assertThat(context).doesNotHaveBean(BatchLogRecordProcessor.class);
+			assertThat(context).doesNotHaveBean(SdkLoggerProvider.class);
+		});
+	}
+
+	@Test
+	void shouldBackOffOnCustomBeans() {
+		this.contextRunner.withUserConfiguration(CustomConfig.class).run((context) -> {
+			assertThat(context).hasBean("customBatchLogRecordProcessor").hasSingleBean(BatchLogRecordProcessor.class);
+			assertThat(context.getBeansOfType(LogRecordProcessor.class)).hasSize(1);
+			assertThat(context).hasBean("customSdkLoggerProvider").hasSingleBean(SdkLoggerProvider.class);
+		});
+	}
+
+	@Test
+	void shouldAllowMultipleLogRecordExporter() {
+		this.contextRunner.withUserConfiguration(MultipleLogRecordExporterConfig.class).run((context) -> {
+			assertThat(context).hasSingleBean(BatchLogRecordProcessor.class);
+			assertThat(context.getBeansOfType(LogRecordExporter.class)).hasSize(2);
+			assertThat(context).hasBean("customLogRecordExporter1");
+			assertThat(context).hasBean("customLogRecordExporter2");
+		});
+	}
+
+	@Test
+	void shouldAllowMultipleLogRecordProcessorInAdditionToBatchLogRecordProcessor() {
+		this.contextRunner.withUserConfiguration(MultipleLogRecordProcessorConfig.class).run((context) -> {
+			assertThat(context).hasSingleBean(BatchLogRecordProcessor.class);
+			assertThat(context).hasSingleBean(SdkLoggerProvider.class);
+			assertThat(context.getBeansOfType(LogRecordProcessor.class)).hasSize(3);
+			assertThat(context).hasBean("batchLogRecordProcessor");
+			assertThat(context).hasBean("customLogRecordProcessor1");
+			assertThat(context).hasBean("customLogRecordProcessor2");
+		});
+	}
+
+	@Test
+	void shouldAllowMultipleSdkLoggerProviderBuilderCustomizer() {
+		this.contextRunner.withUserConfiguration(MultipleSdkLoggerProviderBuilderCustomizerConfig.class)
+			.run((context) -> {
+				assertThat(context).hasSingleBean(SdkLoggerProvider.class);
+				assertThat(context.getBeansOfType(NoopSdkLoggerProviderBuilderCustomizer.class)).hasSize(2);
+				assertThat(context).hasBean("customSdkLoggerProviderBuilderCustomizer1");
+				assertThat(context).hasBean("customSdkLoggerProviderBuilderCustomizer2");
+				assertThat(context
+					.getBean("customSdkLoggerProviderBuilderCustomizer1", NoopSdkLoggerProviderBuilderCustomizer.class)
+					.called()).isEqualTo(1);
+				assertThat(context
+					.getBean("customSdkLoggerProviderBuilderCustomizer2", NoopSdkLoggerProviderBuilderCustomizer.class)
+					.called()).isEqualTo(1);
+			});
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	public static class CustomConfig {
+
+		@Bean
+		public BatchLogRecordProcessor customBatchLogRecordProcessor() {
+			return BatchLogRecordProcessor.builder(new NoopLogRecordExporter()).build();
+		}
+
+		@Bean
+		public SdkLoggerProvider customSdkLoggerProvider() {
+			return SdkLoggerProvider.builder().build();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	public static class MultipleLogRecordExporterConfig {
+
+		@Bean
+		public LogRecordExporter customLogRecordExporter1() {
+			return new NoopLogRecordExporter();
+		}
+
+		@Bean
+		public LogRecordExporter customLogRecordExporter2() {
+			return new NoopLogRecordExporter();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	public static class MultipleLogRecordProcessorConfig {
+
+		@Bean
+		public LogRecordProcessor customLogRecordProcessor1() {
+			return new NoopLogRecordProcessor();
+		}
+
+		@Bean
+		public LogRecordProcessor customLogRecordProcessor2() {
+			return new NoopLogRecordProcessor();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	public static class MultipleSdkLoggerProviderBuilderCustomizerConfig {
+
+		@Bean
+		public SdkLoggerProviderBuilderCustomizer customSdkLoggerProviderBuilderCustomizer1() {
+			return new NoopSdkLoggerProviderBuilderCustomizer();
+		}
+
+		@Bean
+		public SdkLoggerProviderBuilderCustomizer customSdkLoggerProviderBuilderCustomizer2() {
+			return new NoopSdkLoggerProviderBuilderCustomizer();
+		}
+
+	}
+
+	static class NoopLogRecordExporter implements LogRecordExporter {
+
+		@Override
+		public CompletableResultCode export(Collection<LogRecordData> logs) {
+			return CompletableResultCode.ofSuccess();
+		}
+
+		@Override
+		public CompletableResultCode flush() {
+			return CompletableResultCode.ofSuccess();
+		}
+
+		@Override
+		public CompletableResultCode shutdown() {
+			return CompletableResultCode.ofSuccess();
+		}
+
+	}
+
+	static class NoopLogRecordProcessor implements LogRecordProcessor {
+
+		@Override
+		public void onEmit(Context context, ReadWriteLogRecord logRecord) {
+
+		}
+
+	}
+
+	static class NoopSdkLoggerProviderBuilderCustomizer implements SdkLoggerProviderBuilderCustomizer {
+
+		final AtomicInteger called = new AtomicInteger(0);
+
+		@Override
+		public void customize(SdkLoggerProviderBuilder builder) {
+			this.called.incrementAndGet();
+		}
+
+		int called() {
+			return this.called.get();
+		}
+
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/otlp/OtlpLoggingAutoConfigurationIntegrationTests.java

@@ -0,0 +1,128 @@
+/*
+ * Copyright 2012-2024 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.actuate.autoconfigure.logging.opentelemetry.otlp;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.time.Instant;
+import java.util.concurrent.TimeUnit;
+
+import io.opentelemetry.api.logs.Severity;
+import io.opentelemetry.sdk.logs.SdkLoggerProvider;
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+import okhttp3.mockwebserver.RecordedRequest;
+import okio.Buffer;
+import okio.GzipSource;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.actuate.autoconfigure.logging.opentelemetry.OpenTelemetryLoggingAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.opentelemetry.OpenTelemetryAutoConfiguration;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.context.ApplicationContext;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Integration tests for {@link OtlpLoggingAutoConfiguration}.
+ *
+ * @author Toshiaki Maki
+ */
+public class OtlpLoggingAutoConfigurationIntegrationTests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+		.withPropertyValues("spring.application.name=otlp-logs-test",
+				"management.otlp.logging.headers.Authorization=Bearer my-token")
+		.withConfiguration(AutoConfigurations.of(OpenTelemetryAutoConfiguration.class,
+				OpenTelemetryLoggingAutoConfiguration.class, OtlpLoggingAutoConfiguration.class));
+
+	private final MockWebServer mockWebServer = new MockWebServer();
+
+	@BeforeEach
+	void setUp() throws IOException {
+		this.mockWebServer.start();
+	}
+
+	@AfterEach
+	void tearDown() throws IOException {
+		this.mockWebServer.close();
+	}
+
+	@Test
+	void httpLogRecordExporterShouldUseProtobufAndNoCompressionByDefault() {
+		this.mockWebServer.enqueue(new MockResponse());
+		this.contextRunner
+			.withPropertyValues("management.otlp.logging.endpoint=http://localhost:%d/v1/logs"
+				.formatted(this.mockWebServer.getPort()))
+			.run((context) -> {
+				logMessage(context);
+				RecordedRequest request = this.mockWebServer.takeRequest(10, TimeUnit.SECONDS);
+				assertThat(request).isNotNull();
+				assertThat(request.getRequestLine()).contains("/v1/logs");
+				assertThat(request.getHeader("Content-Type")).isEqualTo("application/x-protobuf");
+				assertThat(request.getHeader("Content-Encoding")).isNull();
+				assertThat(request.getBodySize()).isPositive();
+				try (Buffer body = request.getBody()) {
+					assertLogMessage(body);
+				}
+			});
+	}
+
+	@Test
+	void httpLogRecordExporterCanBeConfiguredToUseGzipCompression() {
+		this.mockWebServer.enqueue(new MockResponse());
+		this.contextRunner
+			.withPropertyValues("management.otlp.logging.endpoint=http://localhost:%d/v1/logs"
+				.formatted(this.mockWebServer.getPort()), "management.otlp.logging.compression=gzip")
+			.run((context) -> {
+				logMessage(context);
+				RecordedRequest request = this.mockWebServer.takeRequest(10, TimeUnit.SECONDS);
+				assertThat(request).isNotNull();
+				assertThat(request.getRequestLine()).contains("/v1/logs");
+				assertThat(request.getHeader("Content-Type")).isEqualTo("application/x-protobuf");
+				assertThat(request.getHeader("Content-Encoding")).isEqualTo("gzip");
+				assertThat(request.getBodySize()).isPositive();
+				try (Buffer uncompressed = new Buffer(); Buffer body = request.getBody()) {
+					uncompressed.writeAll(new GzipSource(body));
+					assertLogMessage(uncompressed);
+				}
+			});
+	}
+
+	private static void logMessage(ApplicationContext context) {
+		SdkLoggerProvider loggerProvider = context.getBean(SdkLoggerProvider.class);
+		loggerProvider.get("test")
+			.logRecordBuilder()
+			.setSeverity(Severity.INFO)
+			.setSeverityText("INFO")
+			.setBody("Hello")
+			.setTimestamp(Instant.now())
+			.emit();
+	}
+
+	private static void assertLogMessage(Buffer body) {
+		String string = body.readString(StandardCharsets.UTF_8);
+		assertThat(string).contains("otlp-logs-test");
+		assertThat(string).contains("test");
+		assertThat(string).contains("INFO");
+		assertThat(string).contains("Hello");
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/logging/opentelemetry/otlp/OtlpLoggingAutoConfigurationTests.java

@@ -0,0 +1,132 @@
+/*
+ * Copyright 2012-2024 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.actuate.autoconfigure.logging.opentelemetry.otlp;
+
+import io.opentelemetry.exporter.otlp.http.logs.OtlpHttpLogRecordExporter;
+import io.opentelemetry.exporter.otlp.logs.OtlpGrpcLogRecordExporter;
+import io.opentelemetry.sdk.logs.export.LogRecordExporter;
+import okhttp3.HttpUrl;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import org.springframework.boot.actuate.autoconfigure.logging.opentelemetry.otlp.OtlpLoggingConfigurations.ConnectionDetails.PropertiesOtlpLoggingConnectionDetails;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.test.context.FilteredClassLoader;
+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 OtlpLoggingAutoConfiguration}.
+ *
+ * @author Toshiaki Maki
+ */
+class OtlpLoggingAutoConfigurationTests {
+
+	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+		.withConfiguration(AutoConfigurations.of(OtlpLoggingAutoConfiguration.class));
+
+	@Test
+	void shouldNotSupplyBeansIfPropertyIsNotSet() {
+		this.contextRunner.run((context) -> {
+			assertThat(context).doesNotHaveBean(OtlpLoggingConnectionDetails.class);
+			assertThat(context).doesNotHaveBean(OtlpHttpLogRecordExporter.class);
+		});
+	}
+
+	@Test
+	void shouldSupplyBeans() {
+		this.contextRunner.withPropertyValues("management.otlp.logging.endpoint=http://localhost:4318/v1/logs")
+			.run((context) -> {
+				assertThat(context).hasSingleBean(OtlpLoggingConnectionDetails.class);
+				OtlpLoggingConnectionDetails connectionDetails = context.getBean(OtlpLoggingConnectionDetails.class);
+				assertThat(connectionDetails.getEndpoint()).isEqualTo("http://localhost:4318/v1/logs");
+				assertThat(context).hasSingleBean(OtlpHttpLogRecordExporter.class)
+					.hasSingleBean(LogRecordExporter.class);
+			});
+	}
+
+	@ParameterizedTest
+	@ValueSource(strings = { "io.opentelemetry.sdk.logs", "io.opentelemetry.api",
+			"io.opentelemetry.exporter.otlp.http.logs" })
+	void shouldNotSupplyBeansIfDependencyIsMissing(String packageName) {
+		this.contextRunner.withClassLoader(new FilteredClassLoader(packageName)).run((context) -> {
+			assertThat(context).doesNotHaveBean(OtlpLoggingConnectionDetails.class);
+			assertThat(context).doesNotHaveBean(OtlpHttpLogRecordExporter.class);
+		});
+	}
+
+	@Test
+	void shouldBackOffWhenCustomHttpExporterIsDefined() {
+		this.contextRunner.withUserConfiguration(CustomHttpExporterConfiguration.class)
+			.run((context) -> assertThat(context).hasBean("customOtlpHttpLogRecordExporter")
+				.hasSingleBean(LogRecordExporter.class));
+	}
+
+	@Test
+	void shouldBackOffWhenCustomGrpcExporterIsDefined() {
+		this.contextRunner.withUserConfiguration(CustomGrpcExporterConfiguration.class)
+			.run((context) -> assertThat(context).hasBean("customOtlpGrpcLogRecordExporter")
+				.hasSingleBean(LogRecordExporter.class));
+	}
+
+	@Test
+	void shouldBackOffWhenCustomOtlpLogsConnectionDetailsIsDefined() {
+		this.contextRunner.withUserConfiguration(CustomOtlpLogsConnectionDetails.class).run((context) -> {
+			assertThat(context).hasSingleBean(OtlpLoggingConnectionDetails.class)
+				.doesNotHaveBean(PropertiesOtlpLoggingConnectionDetails.class);
+			OtlpHttpLogRecordExporter otlpHttpLogRecordExporter = context.getBean(OtlpHttpLogRecordExporter.class);
+			assertThat(otlpHttpLogRecordExporter).extracting("delegate.httpSender.url")
+				.isEqualTo(HttpUrl.get("https://otel.example.com/v1/logs"));
+		});
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	public static class CustomHttpExporterConfiguration {
+
+		@Bean
+		public OtlpHttpLogRecordExporter customOtlpHttpLogRecordExporter() {
+			return OtlpHttpLogRecordExporter.builder().build();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	public static class CustomGrpcExporterConfiguration {
+
+		@Bean
+		public OtlpGrpcLogRecordExporter customOtlpGrpcLogRecordExporter() {
+			return OtlpGrpcLogRecordExporter.builder().build();
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	public static class CustomOtlpLogsConnectionDetails {
+
+		@Bean
+		public OtlpLoggingConnectionDetails customOtlpLogsConnectionDetails() {
+			return () -> "https://otel.example.com/v1/logs";
+		}
+
+	}
+
+}