Add status update debug log

Author: russgold

operator/src/main/java/oracle/kubernetes/operator/DomainStatusUpdater.java

@@ -14,6 +14,8 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 import javax.annotation.Nonnull;
+import javax.json.Json;
+import javax.json.JsonPatchBuilder;
 
 import io.kubernetes.client.openapi.ApiException;
 import io.kubernetes.client.openapi.models.V1ObjectMeta;
@@ -181,6 +183,9 @@ public NextAction apply(Packet packet) {
 
     private Step createDomainStatusReplaceStep(DomainStatusUpdaterContext context, DomainStatus newStatus) {
       LOGGER.fine(MessageKeys.DOMAIN_STATUS, context.getDomainUid(), newStatus);
+      if (LOGGER.isFinerEnabled()) {
+        LOGGER.finer("status change: " + createPatchString(context, newStatus));
+      }
       Domain oldDomain = context.getDomain();
       Domain newDomain = new Domain()
           .withKind(KubernetesConstants.DOMAIN)
@@ -196,6 +201,12 @@ private Step createDomainStatusReplaceStep(DomainStatusUpdaterContext context, D
             createResponseStep(context, getNext()));
     }
 
+    private String createPatchString(DomainStatusUpdaterContext context, DomainStatus newStatus) {
+      JsonPatchBuilder builder = Json.createPatchBuilder();
+      newStatus.createPatchFrom(builder, context.getStatus());
+      return builder.build().toString();
+    }
+
     private ResponseStep<Domain> createResponseStep(DomainStatusUpdaterContext context, Step next) {
       return new StatusReplaceResponseStep(this, context, next);
     }