Add EndpointObjectMapper supported types method

Issue: 45876

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/jackson/EndpointObjectMapper.java

@@ -16,13 +16,15 @@
 
 package org.springframework.boot.actuate.endpoint.jackson;
 
+import java.util.Set;
+
 import com.fasterxml.jackson.databind.ObjectMapper;
 
 import org.springframework.boot.actuate.endpoint.OperationResponseBody;
 
 /**
  * Interface used to supply the {@link ObjectMapper} that should be used when serializing
- * {@link OperationResponseBody} endpoint results.
+ * endpoint results.
  *
  * @author Phillip Webb
  * @since 3.0.0
@@ -30,6 +32,11 @@ import org.springframework.boot.actuate.endpoint.OperationResponseBody;
  */
 public interface EndpointObjectMapper {
 
+	/**
+	 * The default supported types.
+	 */
+	Set<Class<?>> DEFAULT_SUPPORTED_TYPES = Set.of(OperationResponseBody.class);
+
 	/**
 	 * Return the {@link ObjectMapper} that should be used to serialize
 	 * {@link OperationResponseBody} endpoint results.
@@ -37,4 +44,13 @@ public interface EndpointObjectMapper {
 	 */
 	ObjectMapper get();
 
+	/**
+	 * Return the types that this endpoint mapper supports.
+	 * @return the supported types
+	 * @since 4.0.0
+	 */
+	default Set<Class<?>> getSupportedTypes() {
+		return DEFAULT_SUPPORTED_TYPES;
+	}
+
 }