Restore level of warning message

Author: larry-safran

xds/src/main/java/io/grpc/xds/client/XdsClientImpl.java

@@ -940,7 +940,7 @@ void onAbsent(@Nullable ProcessingTracker processingTracker) {
               && controlPlaneClient.getServerInfo().ignoreResourceDeletion();
       if (ignoreResourceDeletionEnabled && type.isFullStateOfTheWorld() && data != null) {
         if (!resourceDeletionIgnored) {
-          logger.log(XdsLogLevel.DEBUG,
+          logger.log(XdsLogLevel.FORCE_WARNING,
               "xds server {0}: ignoring deletion for resource type {1} name {2}}",
               getTarget(), type, resource);
           resourceDeletionIgnored = true;