Consistently clean actuator endpoint ids

Closes gh-18649

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/health/IncludeExcludeGroupMemberPredicate.java

@@ -20,6 +20,7 @@ import java.util.Collections;
 import java.util.LinkedHashSet;
 import java.util.Set;
 import java.util.function.Predicate;
+import java.util.stream.Collectors;
 
 /**
  * Member predicate that matches based on {@code include} and {@code exclude} sets.
@@ -54,12 +55,12 @@ class IncludeExcludeGroupMemberPredicate implements Predicate<String> {
 		if (names == null) {
 			return Collections.emptySet();
 		}
-		Set<String> cleaned = new LinkedHashSet<>(names);
+		Set<String> cleaned = names.stream().map(this::clean).collect(Collectors.toCollection(LinkedHashSet::new));
 		return Collections.unmodifiableSet(cleaned);
 	}
 
 	private String clean(String name) {
-		return name.trim().toLowerCase();
+		return name.trim();
 	}
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/health/IncludeExcludeGroupMemberPredicateTests.java

@@ -68,6 +68,24 @@ class IncludeExcludeGroupMemberPredicateTests {
 		assertThat(predicate).rejects("a", "b", "c", "d");
 	}
 
+	@Test
+	void testWhenCamelCaseIncludeAcceptsOnlyIncluded() {
+		Predicate<String> predicate = include("myEndpoint").exclude();
+		assertThat(predicate).accepts("myEndpoint").rejects("d");
+	}
+
+	@Test
+	void testWhenHyphenCaseIncludeAcceptsOnlyIncluded() {
+		Predicate<String> predicate = include("my-endpoint").exclude();
+		assertThat(predicate).accepts("my-endpoint").rejects("d");
+	}
+
+	@Test
+	void testWhenExtraWhitespaceAcceptsTrimmedVersion() {
+		Predicate<String> predicate = include("  myEndpoint  ").exclude();
+		assertThat(predicate).accepts("myEndpoint").rejects("d");
+	}
+
 	private Builder include(String... include) {
 		return new Builder(include);
 	}