Add connect timeout properties for OTLP tracing

- Rename OtlpProperties to OtlpTracingProperties

See gh-41460
See gh-42528

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

@@ -16,14 +16,11 @@
 
 package org.springframework.boot.actuate.autoconfigure.tracing.otlp;
 
-import java.util.Map.Entry;
-
 import io.opentelemetry.exporter.otlp.http.trace.OtlpHttpSpanExporter;
 import io.opentelemetry.exporter.otlp.http.trace.OtlpHttpSpanExporterBuilder;
 import io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporter;
 import io.opentelemetry.exporter.otlp.trace.OtlpGrpcSpanExporterBuilder;
 
-import org.springframework.boot.actuate.autoconfigure.opentelemetry.otlp.Transport;
 import org.springframework.boot.actuate.autoconfigure.tracing.ConditionalOnEnabledTracing;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
@@ -33,7 +30,7 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.util.Assert;
 
 /**
- * Configurations imported by {@link OtlpAutoConfiguration}.
+ * Configurations imported by {@link OtlpTracingAutoConfiguration}.
  *
  * @author Moritz Halbritter
  * @author Eddú Meléndez
@@ -46,18 +43,18 @@ class OtlpTracingConfigurations {
 		@Bean
 		@ConditionalOnMissingBean
 		@ConditionalOnProperty(prefix = "management.otlp.tracing", name = "endpoint")
-		OtlpTracingConnectionDetails otlpTracingConnectionDetails(OtlpProperties properties) {
+		OtlpTracingConnectionDetails otlpTracingConnectionDetails(OtlpTracingProperties properties) {
 			return new PropertiesOtlpTracingConnectionDetails(properties);
 		}
 
 		/**
-		 * Adapts {@link OtlpProperties} to {@link OtlpTracingConnectionDetails}.
+		 * Adapts {@link OtlpTracingProperties} to {@link OtlpTracingConnectionDetails}.
 		 */
 		static class PropertiesOtlpTracingConnectionDetails implements OtlpTracingConnectionDetails {
 
-			private final OtlpProperties properties;
+			private final OtlpTracingProperties properties;
 
-			PropertiesOtlpTracingConnectionDetails(OtlpProperties properties) {
+			PropertiesOtlpTracingConnectionDetails(OtlpTracingProperties properties) {
 				this.properties = properties;
 			}
 
@@ -82,29 +79,27 @@ class OtlpTracingConfigurations {
 		@Bean
 		@ConditionalOnProperty(prefix = "management.otlp.tracing", name = "transport", havingValue = "http",
 				matchIfMissing = true)
-		OtlpHttpSpanExporter otlpHttpSpanExporter(OtlpProperties properties,
+		OtlpHttpSpanExporter otlpHttpSpanExporter(OtlpTracingProperties properties,
 				OtlpTracingConnectionDetails connectionDetails) {
 			OtlpHttpSpanExporterBuilder builder = OtlpHttpSpanExporter.builder()
 				.setEndpoint(connectionDetails.getUrl(Transport.HTTP))
 				.setTimeout(properties.getTimeout())
+				.setConnectTimeout(properties.getConnectTimeout())
 				.setCompression(properties.getCompression().name().toLowerCase());
-			for (Entry<String, String> header : properties.getHeaders().entrySet()) {
-				builder.addHeader(header.getKey(), header.getValue());
-			}
+			properties.getHeaders().forEach(builder::addHeader);
 			return builder.build();
 		}
 
 		@Bean
 		@ConditionalOnProperty(prefix = "management.otlp.tracing", name = "transport", havingValue = "grpc")
-		OtlpGrpcSpanExporter otlpGrpcSpanExporter(OtlpProperties properties,
+		OtlpGrpcSpanExporter otlpGrpcSpanExporter(OtlpTracingProperties properties,
 				OtlpTracingConnectionDetails connectionDetails) {
 			OtlpGrpcSpanExporterBuilder builder = OtlpGrpcSpanExporter.builder()
 				.setEndpoint(connectionDetails.getUrl(Transport.GRPC))
 				.setTimeout(properties.getTimeout())
+				.setConnectTimeout(properties.getConnectTimeout())
 				.setCompression(properties.getCompression().name().toLowerCase());
-			for (Entry<String, String> header : properties.getHeaders().entrySet()) {
-				builder.addHeader(header.getKey(), header.getValue());
-			}
+			properties.getHeaders().forEach(builder::addHeader);
 			return builder.build();
 		}
 

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

@@ -16,7 +16,6 @@
 
 package org.springframework.boot.actuate.autoconfigure.tracing.otlp;
 
-import org.springframework.boot.actuate.autoconfigure.opentelemetry.otlp.Transport;
 import org.springframework.boot.autoconfigure.service.connection.ConnectionDetails;
 
 /**

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

@@ -20,8 +20,6 @@ import java.time.Duration;
 import java.util.HashMap;
 import java.util.Map;
 
-import org.springframework.boot.actuate.autoconfigure.opentelemetry.otlp.Compression;
-import org.springframework.boot.actuate.autoconfigure.opentelemetry.otlp.Transport;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 
 /**
@@ -31,7 +29,7 @@ import org.springframework.boot.context.properties.ConfigurationProperties;
  * @since 3.1.0
  */
 @ConfigurationProperties("management.otlp.tracing")
-public class OtlpProperties {
+public class OtlpTracingProperties {
 
 	/**
 	 * URL to the OTel collector's HTTP API.
@@ -46,6 +44,11 @@ public class OtlpProperties {
 	 */
 	private Duration timeout = Duration.ofSeconds(10);
 
+	/**
+	 * Connect timeout for the OTel collector connection.
+	 */
+	private Duration connectTimeout = Duration.ofSeconds(10);
+
 	/**
 	 * Transport used to send the spans.
 	 */
@@ -77,6 +80,14 @@ public class OtlpProperties {
 		this.timeout = timeout;
 	}
 
+	public Duration getConnectTimeout() {
+		return this.connectTimeout;
+	}
+
+	public void setConnectTimeout(Duration connectTimeout) {
+		this.connectTimeout = connectTimeout;
+	}
+
 	public Transport getTransport() {
 		return this.transport;
 	}
@@ -101,4 +112,18 @@ public class OtlpProperties {
 		this.headers = 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/tracing/otlp/Transport.java

@@ -14,24 +14,24 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.actuate.autoconfigure.opentelemetry.otlp;
+package org.springframework.boot.actuate.autoconfigure.tracing.otlp;
 
 /**
- * Algorithm used to compress OTLP data.
+ * Transport used to send OTLP data.
  *
  * @author Moritz Halbritter
  * @since 3.4.0
  */
-public enum Compression {
+public enum Transport {
 
 	/**
-	 * Gzip compression.
+	 * HTTP transport.
 	 */
-	GZIP,
+	HTTP,
 
 	/**
-	 * No compression.
+	 * gRPC transport.
 	 */
-	NONE
+	GRPC
 
 }

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

@@ -15,6 +15,6 @@
  */
 
 /**
- * Auto-configuration for tracing with OTLP.
+ * Auto-configuration for exporting traces with OTLP.
  */
 package org.springframework.boot.actuate.autoconfigure.tracing.otlp;