Add property to migrate deprecated endoint IDs

Allow legacy actuator endpoint IDs that contain dots to be transparently
migrated to the new format. This update will allow Spring Cloud users
to proactively migrate from endpoints such as `hystrix.stream` to
`hystrixstream`.

Closes gh-18148

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-actuator/src/main/java/smoketest/actuator/SampleLegacyEndpoint.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2012-2019 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 smoketest.actuator;
+
+import java.util.Collections;
+import java.util.Map;
+
+import org.springframework.boot.actuate.endpoint.annotation.Endpoint;
+import org.springframework.boot.actuate.endpoint.annotation.ReadOperation;
+import org.springframework.stereotype.Component;
+
+@Component
+@Endpoint(id = "lega.cy")
+public class SampleLegacyEndpoint {
+
+	@ReadOperation
+	public Map<String, String> example() {
+		return Collections.singletonMap("legacy", "legacy");
+	}
+
+}

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-actuator/src/main/resources/application.properties

@@ -24,3 +24,4 @@ management.endpoint.health.show-details=always
 management.endpoint.health.group.ready.include=db,diskSpace
 management.endpoint.health.group.live.include=example,hello,db
 management.endpoint.health.group.live.show-details=never
+management.endpoints.migrate-legacy-ids=true

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-actuator/src/test/java/smoketest/actuator/SampleActuatorApplicationTests.java

@@ -36,6 +36,7 @@ import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.entry;
 
 /**
  * Basic integration tests for service demo application.
@@ -188,6 +189,17 @@ class SampleActuatorApplicationTests {
 		assertThat(beans).containsKey("spring.datasource-" + DataSourceProperties.class.getName());
 	}
 
+	@Test
+	void testLegacy() {
+		@SuppressWarnings("rawtypes")
+		ResponseEntity<Map> entity = this.restTemplate.withBasicAuth("user", getPassword())
+				.getForEntity("/actuator/legacy", Map.class);
+		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.OK);
+		@SuppressWarnings("unchecked")
+		Map<String, Object> body = entity.getBody();
+		assertThat(body).contains(entry("legacy", "legacy"));
+	}
+
 	private String getPassword() {
 		return "password";
 	}