Align default log levels for Log4j2 and Logback

Fixes gh-21293

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java

@@ -109,6 +109,7 @@ class DefaultLogbackConfiguration {
 		config.logger("org.apache.tomcat.util.net.NioSelectorPool", Level.WARN);
 		config.logger("org.eclipse.jetty.util.component.AbstractLifeCycle", Level.ERROR);
 		config.logger("org.hibernate.validator.internal.util.Version", Level.WARN);
+		config.logger("org.springframework.boot.actuate.endpoint.jmx", Level.WARN);
 	}
 
 	private Appender<ILoggingEvent> consoleAppender(LogbackConfigurator config) {

spring-boot-project/spring-boot/src/main/resources/org/springframework/boot/logging/logback/defaults.xml

@@ -18,4 +18,5 @@ Default logback configuration provided for import
 	<logger name="org.apache.tomcat.util.net.NioSelectorPool" level="WARN"/>
 	<logger name="org.eclipse.jetty.util.component.AbstractLifeCycle" level="ERROR"/>
 	<logger name="org.hibernate.validator.internal.util.Version" level="WARN"/>
+	<logger name="org.springframework.boot.actuate.endpoint.jmx" level="WARN"/>
 </included>