Use ServerHttpResponse.getRawStatusCode() in WebFluxTags

See gh-19987

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/web/reactive/server/WebFluxTags.java

@@ -22,7 +22,6 @@ import io.micrometer.core.instrument.Tag;
 
 import org.springframework.boot.actuate.metrics.http.Outcome;
 import org.springframework.http.HttpStatus;
-import org.springframework.http.server.reactive.AbstractServerHttpResponse;
 import org.springframework.http.server.reactive.ServerHttpResponse;
 import org.springframework.util.StringUtils;
 import org.springframework.web.reactive.HandlerMapping;
@@ -164,11 +163,9 @@ public final class WebFluxTags {
 
 	private static Integer extractStatusCode(ServerWebExchange exchange) {
 		ServerHttpResponse response = exchange.getResponse();
-		if (response instanceof AbstractServerHttpResponse) {
-			Integer statusCode = ((AbstractServerHttpResponse) response).getStatusCodeValue();
-			if (statusCode != null) {
-				return statusCode;
-			}
+		Integer statusCode = response.getRawStatusCode();
+		if (statusCode != null) {
+			return statusCode;
 		}
 		HttpStatus status = response.getStatusCode();
 		return (status != null) ? status.value() : null;

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/reactive/server/WebFluxTagsTests.java

@@ -21,8 +21,8 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.http.HttpStatus;
-import org.springframework.http.server.reactive.AbstractServerHttpResponse;
 import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpResponse;
 import org.springframework.mock.http.server.reactive.MockServerHttpRequest;
 import org.springframework.mock.web.server.MockServerWebExchange;
 import org.springframework.web.reactive.HandlerMapping;
@@ -123,9 +123,9 @@ class WebFluxTagsTests {
 	void outcomeTagIsSuccessWhenResponseStatusIsAvailableFromUnderlyingServer() {
 		ServerWebExchange exchange = mock(ServerWebExchange.class);
 		ServerHttpRequest request = mock(ServerHttpRequest.class);
-		AbstractServerHttpResponse response = mock(AbstractServerHttpResponse.class);
+		ServerHttpResponse response = mock(ServerHttpResponse.class);
 		given(response.getStatusCode()).willReturn(HttpStatus.OK);
-		given(response.getStatusCodeValue()).willReturn(null);
+		given(response.getRawStatusCode()).willReturn(null);
 		given(exchange.getRequest()).willReturn(request);
 		given(exchange.getResponse()).willReturn(response);
 		Tag tag = WebFluxTags.outcome(exchange);