Set Logback's root log level to INFO as early as possible

Closes gh-35238

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

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.logging.logback;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.LoggerContext;
+import ch.qos.logback.classic.spi.Configurator;
+import ch.qos.logback.core.spi.ContextAwareBase;
+import org.slf4j.Logger;
+
+/**
+ * Logback {@link Configurator}, registered through {@code META-INF/services}, that sets
+ * the root log level to {@link Level#INFO}.
+ *
+ * @author Andy Wilkinson
+ * @since 3.1.0
+ */
+public class RootLogLevelConfigurator extends ContextAwareBase implements Configurator {
+
+	@Override
+	public ExecutionStatus configure(LoggerContext loggerContext) {
+		loggerContext.getLogger(Logger.ROOT_LOGGER_NAME).setLevel(Level.INFO);
+		return ExecutionStatus.INVOKE_NEXT_IF_ANY;
+	}
+
+}

spring-boot-project/spring-boot/src/main/resources/META-INF/services/ch.qos.logback.classic.spi.Configurator

@@ -0,0 +1 @@
+org.springframework.boot.logging.logback.RootLogLevelConfigurator

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/RootLogLevelConfiguratorTests.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.logging.logback;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.LoggerContext;
+import ch.qos.logback.classic.spi.Configurator.ExecutionStatus;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link RootLogLevelConfigurator}.
+ *
+ * @author Andy Wilkinson
+ */
+class RootLogLevelConfiguratorTests {
+
+	@Test
+	void shouldSetRootLogLevelToInfo() {
+		LoggerContext context = new LoggerContext();
+		assertThat(context.getLogger(Logger.ROOT_LOGGER_NAME).getLevel()).isEqualTo(Level.DEBUG);
+		assertThat(new RootLogLevelConfigurator().configure(context)).isEqualTo(ExecutionStatus.INVOKE_NEXT_IF_ANY);
+		assertThat(context.getLogger(Logger.ROOT_LOGGER_NAME).getLevel()).isEqualTo(Level.INFO);
+	}
+
+}