feat: add tracing starters && add zipkin auto configuration

.artifacts

@@ -102,6 +102,9 @@ dubbo-spring-boot-autoconfigure
 dubbo-spring-boot-autoconfigure-compatible
 dubbo-spring-boot-compatible
 dubbo-spring-boot-observability-starter
+dubbo-spring-boot-observability-autoconfigure
+dubbo-spring-boot-tracing-brave-zipkin-starter
+dubbo-spring-boot-tracing-otel-zipkin-starter
 dubbo-spring-boot-starter
 dubbo-spring-security
 dubbo-xds

dubbo-common/src/main/java/org/apache/dubbo/config/TracingConfig.java

@@ -14,9 +14,11 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.apache.dubbo.config;
 
 import org.apache.dubbo.config.nested.BaggageConfig;
+import org.apache.dubbo.config.nested.ExporterConfig;
 import org.apache.dubbo.config.nested.PropagationConfig;
 import org.apache.dubbo.config.nested.SamplingConfig;
 import org.apache.dubbo.config.support.Nested;
@@ -49,6 +51,12 @@ public class TracingConfig extends AbstractConfig {
     @Nested
     private PropagationConfig propagation = new PropagationConfig();
 
+    /**
+     * Exporter configuration.
+     */
+    @Nested
+    private ExporterConfig tracingExporter = new ExporterConfig();
+
     public TracingConfig() {
     }
 
@@ -87,4 +95,12 @@ public PropagationConfig getPropagation() {
     public void setPropagation(PropagationConfig propagation) {
         this.propagation = propagation;
     }
+
+    public ExporterConfig getTracingExporter() {
+        return tracingExporter;
+    }
+
+    public void setTracingExporter(ExporterConfig tracingExporter) {
+        this.tracingExporter = tracingExporter;
+    }
 }

dubbo-common/src/main/java/org/apache/dubbo/config/nested/ExporterConfig.java

@@ -0,0 +1,79 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ *     http://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.apache.dubbo.config.nested;
+
+import org.apache.dubbo.config.support.Nested;
+
+import java.io.Serializable;
+import java.time.Duration;
+
+public class ExporterConfig implements Serializable {
+
+    @Nested
+    private ZipkinConfig zipkinConfig;
+
+    public ZipkinConfig getZipkinConfig() {
+        return zipkinConfig;
+    }
+
+    public void setZipkinConfig(ZipkinConfig zipkinConfig) {
+        this.zipkinConfig = zipkinConfig;
+    }
+
+    public static class ZipkinConfig implements Serializable {
+
+        /**
+         * URL to the Zipkin API.
+         */
+        private String endpoint;
+
+        /**
+         * Connection timeout for requests to Zipkin.
+         */
+        private Duration connectTimeout = Duration.ofSeconds(1);
+
+        /**
+         * Read timeout for requests to Zipkin.
+         */
+        private Duration readTimeout = Duration.ofSeconds(10);
+
+        public String getEndpoint() {
+            return endpoint;
+        }
+
+        public void setEndpoint(String endpoint) {
+            this.endpoint = endpoint;
+        }
+
+        public Duration getConnectTimeout() {
+            return connectTimeout;
+        }
+
+        public void setConnectTimeout(Duration connectTimeout) {
+            this.connectTimeout = connectTimeout;
+        }
+
+        public Duration getReadTimeout() {
+            return readTimeout;
+        }
+
+        public void setReadTimeout(Duration readTimeout) {
+            this.readTimeout = readTimeout;
+        }
+    }
+}

dubbo-config/dubbo-config-spring/src/main/resources/META-INF/dubbo.xsd

@@ -1210,6 +1210,7 @@
     <xsd:complexType name="baggageType">
         <xsd:all>
             <xsd:element ref="remoteFields" minOccurs="0"/>
+            <xsd:element ref="correlation" minOccurs="0"/>
         </xsd:all>
         <xsd:attribute name="enabled" type="xsd:boolean">
             <xsd:annotation>
@@ -1238,6 +1239,33 @@
         </xsd:simpleContent>
     </xsd:complexType>
 
+    <xsd:complexType name="tracingExporterType">
+        <xsd:all>
+            <xsd:element ref="zipkin-config" minOccurs="0"/>
+        </xsd:all>
+    </xsd:complexType>
+
+    <xsd:complexType name="zipkinConfigType">
+        <xsd:attribute name="endpoint" type="xsd:string">
+            <xsd:annotation>
+                <xsd:documentation>
+                    <![CDATA[ The url of zipkin server. ]]></xsd:documentation>
+            </xsd:annotation>
+        </xsd:attribute>
+        <xsd:attribute name="connectTimeout" type="xsd:duration">
+            <xsd:annotation>
+                <xsd:documentation>
+                    <![CDATA[ Connection timeout for requests to Zipkin. ]]></xsd:documentation>
+            </xsd:annotation>
+        </xsd:attribute>
+        <xsd:attribute name="readTimeout" type="xsd:duration">
+            <xsd:annotation>
+                <xsd:documentation>
+                    <![CDATA[ Read timeout for requests to Zipkin. ]]></xsd:documentation>
+            </xsd:annotation>
+        </xsd:attribute>
+    </xsd:complexType>
+
     <xsd:complexType name="methodType">
         <xsd:complexContent>
             <xsd:extension base="abstractMethodType">
@@ -2187,4 +2215,18 @@
                 means that these fields would end up as key-value pairs in e.g. MDC. ]]></xsd:documentation>
         </xsd:annotation>
     </xsd:element>
+
+    <xsd:element name="tracing-exporter" type="tracingExporterType">
+        <xsd:annotation>
+            <xsd:documentation>
+                <![CDATA[ Exporter of tracing. ]]></xsd:documentation>
+        </xsd:annotation>
+    </xsd:element>
+
+    <xsd:element name="zipkin-config" type="zipkinConfigType">
+        <xsd:annotation>
+            <xsd:documentation>
+                <![CDATA[ Config of zipkin exporter. ]]></xsd:documentation>
+        </xsd:annotation>
+    </xsd:element>
 </xsd:schema>

dubbo-demo/dubbo-demo-spring-boot/dubbo-demo-spring-boot-consumer/pom.xml

@@ -125,7 +125,7 @@
 
         <dependency>
             <groupId>org.apache.dubbo</groupId>
-            <artifactId>dubbo-spring-boot-observability-starter</artifactId>
+            <artifactId>dubbo-spring-boot-tracing-otel-zipkin-starter</artifactId>
         </dependency>
 
         <dependency>

dubbo-demo/dubbo-demo-spring-boot/dubbo-demo-spring-boot-provider/pom.xml

@@ -120,7 +120,7 @@
         <!-- Observability -->
         <dependency>
             <groupId>org.apache.dubbo</groupId>
-            <artifactId>dubbo-spring-boot-observability-starter</artifactId>
+            <artifactId>dubbo-spring-boot-tracing-otel-zipkin-starter</artifactId>
         </dependency>
 
         <dependency>

dubbo-distribution/dubbo-bom/pom.xml

@@ -502,6 +502,21 @@
                 <artifactId>dubbo-spring-boot-observability-starter</artifactId>
                 <version>${project.version}</version>
             </dependency>
+            <dependency>
+                <groupId>org.apache.dubbo</groupId>
+                <artifactId>dubbo-spring-boot-observability-autoconfigure</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>org.apache.dubbo</groupId>
+                <artifactId>dubbo-spring-boot-tracing-otel-zipkin-starter</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>org.apache.dubbo</groupId>
+                <artifactId>dubbo-spring-boot-tracing-brave-zipkin-starter</artifactId>
+                <version>${project.version}</version>
+            </dependency>
 
             <!-- test -->
             <dependency>

dubbo-spring-boot/dubbo-spring-boot-observability-starter/dubbo-spring-boot-observability-autoconfigure/pom.xml

@@ -0,0 +1,147 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one or more
+  contributor license agreements.  See the NOTICE file distributed with
+  this work for additional information regarding copyright ownership.
+  The ASF licenses this file to You 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
+
+      http://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.
+  -->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>dubbo-spring-boot-observability-starter</artifactId>
+        <groupId>org.apache.dubbo</groupId>
+        <version>${revision}</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>dubbo-spring-boot-observability-autoconfigure</artifactId>
+
+    <dependencies>
+        <!-- micrometer -->
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-tracing</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-observation</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-registry-prometheus</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.tdunning</groupId>
+            <artifactId>t-digest</artifactId>
+        </dependency>
+
+        <!-- spring -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-autoconfigure</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-configuration-processor</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-webmvc</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-webflux</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <!-- bridge -->
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-tracing-bridge-otel</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>io.micrometer</groupId>
+            <artifactId>micrometer-tracing-bridge-brave</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <!-- exporter -->
+        <dependency>
+            <groupId>io.opentelemetry</groupId>
+            <artifactId>opentelemetry-exporter-zipkin</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>io.zipkin.reporter2</groupId>
+            <artifactId>zipkin-reporter-brave</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <!-- sender -->
+        <dependency>
+            <groupId>io.zipkin.reporter2</groupId>
+            <artifactId>zipkin-sender-urlconnection</artifactId>
+            <optional>true</optional>
+        </dependency>
+
+        <!-- dubbo -->
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo-spring-boot-starter</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo-common</artifactId>
+            <version>${project.version}</version>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.dubbo</groupId>
+            <artifactId>dubbo-qos</artifactId>
+            <version>${project.version}</version>
+            <optional>true</optional>
+        </dependency>
+
+        <!-- prometheus client -->
+        <dependency>
+            <groupId>io.prometheus</groupId>
+            <artifactId>simpleclient</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.prometheus</groupId>
+            <artifactId>simpleclient_pushgateway</artifactId>
+        </dependency>
+    </dependencies>
+
+</project>