Fix conditions on auto-configured WebMvcMetricsFilter

Closes gh-31150

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/web/servlet/WebMvcMetricsAutoConfiguration.java

@@ -41,6 +41,7 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
+import org.springframework.boot.autoconfigure.web.servlet.ConditionalOnMissingFilterBean;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
 import org.springframework.context.annotation.Bean;
@@ -80,7 +81,7 @@ public class WebMvcMetricsAutoConfiguration {
 	}
 
 	@Bean
-	@ConditionalOnMissingBean
+	@ConditionalOnMissingFilterBean
 	public FilterRegistrationBean<WebMvcMetricsFilter> webMvcMetricsFilter(MeterRegistry registry,
 			WebMvcTagsProvider tagsProvider) {
 		ServerRequest request = this.properties.getWeb().getServer().getRequest();

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/web/servlet/WebMvcMetricsAutoConfigurationTests.java

@@ -122,14 +122,34 @@ class WebMvcMetricsAutoConfigurationTests {
 	}
 
 	@Test
-	void filterRegistrationBacksOff() {
+	void filterRegistrationBacksOffWithAnotherWebMvcMetricsFilterRegistration() {
-		this.contextRunner.withUserConfiguration(TestWebMvcMetricsFilterConfiguration.class).run((context) -> {
+		this.contextRunner.withUserConfiguration(TestWebMvcMetricsFilterRegistrationConfiguration.class)
+				.run((context) -> {
 					assertThat(context).hasSingleBean(FilterRegistrationBean.class);
 					assertThat(context.getBean(FilterRegistrationBean.class))
 							.isSameAs(context.getBean("testWebMvcMetricsFilter"));
 				});
 	}
 
+	@Test
+	void filterRegistrationBacksOffWithAnotherWebMvcMetricsFilter() {
+		this.contextRunner.withUserConfiguration(TestWebMvcMetricsFilterConfiguration.class)
+				.run((context) -> assertThat(context).doesNotHaveBean(FilterRegistrationBean.class)
+						.hasSingleBean(WebMvcMetricsFilter.class));
+	}
+
+	@Test
+	void filterRegistrationDoesNotBackOffWithOtherFilterRegistration() {
+		this.contextRunner.withUserConfiguration(TestFilterRegistrationConfiguration.class)
+				.run((context) -> assertThat(context).hasBean("testFilter").hasBean("webMvcMetricsFilter"));
+	}
+
+	@Test
+	void filterRegistrationDoesNotBackOffWithOtherFilter() {
+		this.contextRunner.withUserConfiguration(TestFilterConfiguration.class)
+				.run((context) -> assertThat(context).hasBean("testFilter").hasBean("webMvcMetricsFilter"));
+	}
+
 	@Test
 	void afterMaxUrisReachedFurtherUrisAreDenied(CapturedOutput output) {
 		this.contextRunner.withUserConfiguration(TestController.class)
@@ -258,7 +278,7 @@ class WebMvcMetricsAutoConfigurationTests {
 	}
 
 	@Configuration(proxyBeanMethods = false)
-	static class TestWebMvcMetricsFilterConfiguration {
+	static class TestWebMvcMetricsFilterRegistrationConfiguration {
 
 		@Bean
 		@SuppressWarnings("unchecked")
@@ -268,4 +288,35 @@ class WebMvcMetricsAutoConfigurationTests {
 
 	}
 
+	@Configuration(proxyBeanMethods = false)
+	static class TestWebMvcMetricsFilterConfiguration {
+
+		@Bean
+		WebMvcMetricsFilter testWebMvcMetricsFilter() {
+			return new WebMvcMetricsFilter(null, null, null, null);
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class TestFilterRegistrationConfiguration {
+
+		@Bean
+		@SuppressWarnings("unchecked")
+		FilterRegistrationBean<Filter> testFilter() {
+			return mock(FilterRegistrationBean.class);
+		}
+
+	}
+
+	@Configuration(proxyBeanMethods = false)
+	static class TestFilterConfiguration {
+
+		@Bean
+		Filter testFilter() {
+			return mock(Filter.class);
+		}
+
+	}
+
 }