Initial test case

build.gradle.kts

@@ -230,6 +230,7 @@ dependencies {
     "testWithSpringBoot_2_7RuntimeOnly"("jakarta.xml.bind:jakarta.xml.bind-api:2.3.3")
 
     "testWithSpringBoot_3_0RuntimeOnly"("org.springframework.boot:spring-boot-starter:3.0.+")
+    "testWithSpringBoot_3_0RuntimeOnly"("org.springframework.boot:spring-boot-starter-actuator:3.0.+")
     "testWithSpringBoot_3_0RuntimeOnly"("org.springframework.boot:spring-boot-starter-test:3.0.+")
     "testWithSpringBoot_3_0RuntimeOnly"("org.springframework:spring-context:6.0.+")
     "testWithSpringBoot_3_0RuntimeOnly"("org.springframework:spring-web:6.0.+")
@@ -241,6 +242,7 @@ dependencies {
     "testWithSpringBoot_3_0RuntimeOnly"("org.springframework.security:spring-security-config:6.0.+")
     "testWithSpringBoot_3_0RuntimeOnly"("org.springframework.security:spring-security-web:6.0.+")
     "testWithSpringBoot_3_0RuntimeOnly"("org.springframework.security:spring-security-ldap:6.0.+")
+    "testWithSpringBoot_3_0RuntimeOnly"("org.apache.tomcat.embed:tomcat-embed-core:10.1.+")
 
     "testWithSpringBoot_3_2RuntimeOnly"("org.springframework.boot:spring-boot-starter:3.2.+")
     "testWithSpringBoot_3_2RuntimeOnly"("org.springframework.boot:spring-boot-starter-test:3.2.+")

src/main/java/org/openrewrite/java/spring/boot3/MigrateWebMvcTagsToObservationConvention.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2024 the original author or authors.
+ * <p>
+ * 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
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.openrewrite.java.spring.boot3;
+
+import org.openrewrite.NlsRewrite;
+import org.openrewrite.Recipe;
+
+public class MigrateWebMvcTagsToObservationConvention extends Recipe {
+    @Override
+    public @NlsRewrite.DisplayName String getDisplayName() {
+        return "Migrate `WebMvcTagsProvider` to `DefaultServerRequestObservationConvention`";
+    }
+
+    @Override
+    public @NlsRewrite.Description String getDescription() {
+        return "Migrate `WebMvcTagsProvider` to `DefaultServerRequestObservationConvention` as part of Spring Boot 3.2 removals.";
+    }
+}

src/testWithSpringBoot_3_0/java/org/openrewrite/java/spring/boot3/MigrateWebMvcTagsToObservationConventionTest.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2024 the original author or authors.
+ * <p>
+ * 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
+ * <p>
+ * https://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.openrewrite.java.spring.boot3;
+
+import org.junit.jupiter.api.Test;
+import org.openrewrite.DocumentExample;
+import org.openrewrite.java.JavaParser;
+import org.openrewrite.test.RecipeSpec;
+import org.openrewrite.test.RewriteTest;
+
+import static org.openrewrite.java.Assertions.java;
+
+class MigrateWebMvcTagsToObservationConventionTest implements RewriteTest {
+
+    @Override
+    public void defaults(RecipeSpec spec) {
+        spec.recipe(new MigrateWebMvcTagsToObservationConvention()).parser(JavaParser.fromJavaVersion().classpath( "micrometer-core", "spring-boot", "spring-context", "spring-beans", "spring-web", "tomcat-embed"));
+    }
+
+    @DocumentExample
+    @Test
+    void ShouldMigrateWebMvcTagsProviderToDefaultServerRequestObservationConvention() {
+        //language=java
+        rewriteRun(
+          java(
+            """
+            import io.micrometer.core.instrument.Tag;
+            import io.micrometer.core.instrument.Tags;
+            import jakarta.servlet.http.HttpServletRequest;
+            import jakarta.servlet.http.HttpServletResponse;
+            import org.springframework.boot.actuate.metrics.web.servlet.WebMvcTags;
+            import org.springframework.boot.actuate.metrics.web.servlet.WebMvcTagsProvider;
+            import org.springframework.stereotype.Component;
+
+            @Component
+            class CustomWebMvcTagsProvider implements WebMvcTagsProvider {
+                @Override
+                public Iterable<Tag> getTags(HttpServletRequest request, HttpServletResponse response, Object handler, Throwable exception) {
+                    Tags tags = Tags.of(WebMvcTags.method(request), WebMvcTags.uri(request, response), WebMvcTags.status(response), WebMvcTags.outcome(response));
+
+                    String customHeader = request.getHeader("X-Custom-Header");
+                    if (customHeader != null) {
+                        tags = tags.and("custom.header", customHeader);
+                    }
+
+                    return tags;
+                }
+            }
+            """,
+            """
+            import io.micrometer.common.KeyValue;
+            import io.micrometer.common.KeyValues;
+            import jakarta.servlet.http.HttpServletRequest;
+            import org.springframework.http.server.observation.DefaultServerRequestObservationConvention;
+            import org.springframework.http.server.observation.ServerRequestObservationContext;
+            import org.springframework.stereotype.Component;
+            
+            @Component
+            class ServerRequestObservationConvention extends DefaultServerRequestObservationConvention {
+
+                @Override
+                public KeyValues getLowCardinalityKeyValues(ServerRequestObservationContext context) {
+                    KeyValues values = super.getLowCardinalityKeyValues(context);
+
+                    HttpServletRequest request = context.get(HttpServletRequest.class);
+                    String customHeader = request.getHeader("X-Custom-Header");
+                    if (customHeader != null) {
+                        values.and(KeyValue.of("custom.header", customHeader));
+                    }
+
+                    return super.getLowCardinalityKeyValues(context).and(values);
+                }
+            }
+            """));
+    }
+
+}