Merge pull request #35455 from be-hase

* pr/35455:
  Polish "Fix invalid Zipkin Reporter back-off behavior"
  Fix invalid Zipkin Reporter back-off behavior

Closes gh-35455

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/zipkin/ZipkinConfigurations.java

@@ -118,7 +118,7 @@ class ZipkinConfigurations {
 	static class ReporterConfiguration {
 
 		@Bean
-		@ConditionalOnMissingBean
+		@ConditionalOnMissingBean(Reporter.class)
 		@ConditionalOnBean(Sender.class)
 		AsyncReporter<Span> spanReporter(Sender sender, BytesEncoder<Span> encoder) {
 			return AsyncReporter.builder(sender).build(encoder);

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/zipkin/ZipkinConfigurationsReporterConfigurationTests.java

@@ -56,7 +56,8 @@ class ZipkinConfigurationsReporterConfigurationTests {
 
 	@Test
 	void shouldBackOffOnCustomBeans() {
-		this.contextRunner.withUserConfiguration(CustomConfiguration.class).run((context) -> {
+		this.contextRunner.withUserConfiguration(SenderConfiguration.class, CustomConfiguration.class)
+			.run((context) -> {
 				assertThat(context).hasBean("customReporter");
 				assertThat(context).hasSingleBean(Reporter.class);
 			});