Merge pull request #1663 from Dam14n

* Adding-missing-hint-sleuth:
  Add hint for Sleuth R2dbcTransactionManager instrumentation

Closes gh-1663

Author: mhalbritter

spring-native-configuration/src/main/java/org/springframework/cloud/sleuth/TraceHints.java

@@ -1,5 +1,7 @@
 package org.springframework.cloud.sleuth;
 
+import org.springframework.nativex.hint.AotProxyHint;
+import org.springframework.nativex.hint.ProxyBits;
 import zipkin2.reporter.AsyncReporter;
 
 import org.springframework.cloud.sleuth.autoconfig.brave.BraveAutoConfiguration;
@@ -8,6 +10,7 @@
 import org.springframework.nativex.hint.TypeHint;
 import org.springframework.nativex.type.NativeConfiguration;
 
+@AotProxyHint(targetClass=org.springframework.r2dbc.connection.R2dbcTransactionManager.class, proxyFeatures = ProxyBits.IS_STATIC)
 @NativeHint(trigger = AsyncReporter.class, options = "--enable-url-protocols=http")
 @NativeHint(trigger = BraveAutoConfiguration.class, types = {
 		@TypeHint(typeNames = {"org.springframework.cloud.context.scope.GenericScope$LockedScopedProxyFactoryBean", "brave.kafka.clients.TracingProducer", "brave.kafka.clients.TracingConsumer"})