Add option to ignore services from discovery

spring-boot-admin-docs/src/main/asciidoc/index.adoc

@@ -293,6 +293,10 @@ TIP: When the default conversion kicks in, you can use the `spring.boot.admin.di
 | spring.boot.admin.discovery.converter.health-endpoint
 | Will be appended to the management-url of the discovered service when the health-url is converted by the `DefaultServiceInstanceConverter`.
 | `"health"`
+
+| spring.boot.admin.discovery.ignored-services
+| This services will be ignored when using discovery and not registered as application.
+|
 |===
 
 [[hazelcast-support]]

spring-boot-admin-server/src/main/java/de/codecentric/boot/admin/config/DiscoveryClientConfiguration.java

@@ -49,6 +49,7 @@ public class DiscoveryClientConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
+	@ConfigurationProperties(prefix = "spring.boot.admin.discovery")
 	public ApplicationDiscoveryListener applicationDiscoveryListener(
 			ServiceInstanceConverter serviceInstanceConverter) {
 		ApplicationDiscoveryListener listener = new ApplicationDiscoveryListener(discoveryClient,

spring-boot-admin-server/src/main/java/de/codecentric/boot/admin/discovery/ApplicationDiscoveryListener.java

@@ -15,6 +15,9 @@
  */
 package de.codecentric.boot.admin.discovery;
 
+import java.util.HashSet;
+import java.util.Set;
+
 import org.springframework.cloud.client.ServiceInstance;
 import org.springframework.cloud.client.discovery.DiscoveryClient;
 import org.springframework.cloud.client.discovery.event.HeartbeatEvent;
@@ -32,12 +35,16 @@ import de.codecentric.boot.admin.registry.ApplicationRegistry;
  * @author Johannes Edmeier
  */
 public class ApplicationDiscoveryListener {
-
 	private final DiscoveryClient discoveryClient;
 	private final ApplicationRegistry registry;
 	private final HeartbeatMonitor monitor = new HeartbeatMonitor();
 	private ServiceInstanceConverter converter = new DefaultServiceInstanceConverter();
 
+	/**
+	 * Set of serviceIds to be ignored and not to be registered as application.
+	 */
+	private Set<String> ignoredServices = new HashSet<>();
+
 	public ApplicationDiscoveryListener(DiscoveryClient discoveryClient,
 			ApplicationRegistry registry) {
 		this.discoveryClient = discoveryClient;
@@ -68,7 +75,9 @@ public class ApplicationDiscoveryListener {
 	protected void discover() {
 		for (String serviceId : discoveryClient.getServices()) {
 			for (ServiceInstance instance : discoveryClient.getInstances(serviceId)) {
-				registry.register(convert(instance));
+				if (!ignoredServices.contains(serviceId)) {
+					registry.register(convert(instance));
+				}
 			}
 		}
 	}
@@ -80,4 +89,8 @@ public class ApplicationDiscoveryListener {
 	public void setConverter(ServiceInstanceConverter converter) {
 		this.converter = converter;
 	}
+
+	public void setIgnoredServices(Set<String> ignoredServices) {
+		this.ignoredServices = ignoredServices;
+	}
 }
\ No newline at end of file

spring-boot-admin-server/src/test/java/de/codecentric/boot/admin/discovery/ApplicationDiscoveryListenerTest.java

@@ -51,6 +51,18 @@ public class ApplicationDiscoveryListenerTest {
 	}
 
 	@Test
+	public void test_ignore() {
+		when(discovery.getServices()).thenReturn(Collections.singletonList("service"));
+		when(discovery.getInstances("service")).thenReturn(Collections.singletonList(
+				(ServiceInstance) new DefaultServiceInstance("service", "localhost", 80, false)));
+
+		listener.setIgnoredServices(Collections.singleton("service"));
+		listener.onInstanceRegistered(new InstanceRegisteredEvent<>(new Object(), null));
+
+		assertEquals(0, registry.getApplications().size());
+	}
+
+	@Test
 	public void test_register_and_convert() {
 		when(discovery.getServices()).thenReturn(Collections.singletonList("service"));
 		when(discovery.getInstances("service")).thenReturn(Collections.singletonList(