add InstanceRegisteredEvent

src/main/java/org/springframework/cloud/client/discovery/AbstractDiscoveryLifecycle.java

@@ -45,9 +45,12 @@ public abstract class AbstractDiscoveryLifecycle implements DiscoveryLifecycle,
         if (ManagementServerPortUtils.isDifferent(context)) {
             registerManagement();
         }
+        context.publishEvent(new InstanceRegisteredEvent<>(this, getConfiguration()));
         running = true;
     }
 
+    protected abstract Object getConfiguration();
+
     protected abstract void register();
 
     protected void registerManagement() {}