Feature/fixing prometheus (#745)

* Fixing prometheus so that it actually works. Also seems related to https://github.com/micrometer-metrics/micrometer/issues/5093

* cleaning up override

* Limiting exposure

* Added docs

* Added smoketest for prometheus endpoint

* Removing metrics and prometheus exposure by default

* Removing 'info'
Adding parameterized tests for endpoints

* Reintroduced 'info'

* Remove info

* Adjusted comment

src/test/java/ca/uhn/fhir/jpa/starter/ExampleServerR4IT.java

@@ -13,6 +13,10 @@ import ca.uhn.fhir.rest.client.api.ServerValidationModeEnum;
 import jakarta.websocket.ContainerProvider;
 import jakarta.websocket.Session;
 import jakarta.websocket.WebSocketContainer;
+import org.apache.http.client.methods.CloseableHttpResponse;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.apache.http.impl.client.HttpClients;
 import org.hl7.fhir.instance.model.api.IBaseResource;
 import org.hl7.fhir.instance.model.api.IIdType;
 import org.hl7.fhir.r4.model.Bundle;
@@ -29,6 +33,8 @@ import org.hl7.fhir.r4.model.Subscription;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Order;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.web.server.LocalServerPort;
@@ -306,6 +312,17 @@ class ExampleServerR4IT implements IServerSupport {
 			.size();
 	}
 
+	@ParameterizedTest
+	@ValueSource(strings = {"prometheus", "health", "metrics", "info"})
+	void testActuatorEndpointExists(String endpoint) throws IOException {
+
+		CloseableHttpClient httpclient = HttpClients.createDefault();
+		CloseableHttpResponse response = httpclient.execute(new HttpGet("http://localhost:" + port + "/actuator/" + endpoint));
+		int statusCode = response.getStatusLine().getStatusCode();
+		assertEquals(200, statusCode);
+
+	}
+
 	@BeforeEach
 	void beforeEach() {
 

src/test/resources/application.yaml

@@ -1,3 +1,30 @@
+management:
+  #The following configuration will enable the actuator endpoints at /actuator/health, /actuator/info, /actuator/prometheus
+  endpoints:
+    enabled-by-default: false
+    web:
+      exposure:
+        include: 'info,health,prometheus,metrics' # or '*' for all'
+  endpoint:
+    info:
+      enabled: true
+    metrics:
+      enabled: true
+    health:
+      enabled: true
+      probes:
+        enabled: true
+      group:
+        liveness:
+          include:
+            - livenessState
+            - readinessState
+    prometheus:
+      enabled: true
+  prometheus:
+    metrics:
+      export:
+        enabled: true
 spring:
   main:
     allow-circular-references: true