Allow resync in oc observe without --names

pkg/oc/cli/cmd/observe/observe.go

@@ -212,7 +212,7 @@ func NewCmdObserve(fullName string, f *clientcmd.Factory, out, errOut io.Writer)
 	// control observe program behavior
 	cmd.Flags().BoolVar(&options.once, "once", false, "If true, exit with a status code 0 after all current objects have been processed.")
 	cmd.Flags().DurationVar(&options.exitAfterPeriod, "exit-after", 0, "Exit with status code 0 after the provided duration, optional.")
-	cmd.Flags().DurationVar(&options.resyncPeriod, "resync-period", 0, "When non-zero, periodically reprocess every item from the server as a Sync event. Use to ensure external systems are kept up to date. Requires --names")
+	cmd.Flags().DurationVar(&options.resyncPeriod, "resync-period", 0, "When non-zero, periodically reprocess every item from the server as a Sync event. Use to ensure external systems are kept up to date.")
 	cmd.Flags().BoolVar(&options.printMetricsOnExit, "print-metrics-on-exit", false, "If true, on exit write all metrics to stdout.")
 	cmd.Flags().StringVar(&options.listenAddr, "listen-addr", options.listenAddr, "The name of an interface to listen on to expose metrics and health checking.")
 
@@ -378,7 +378,7 @@ func (o *ObserveOptions) Complete(f *clientcmd.Factory, cmd *cobra.Command, args
 			return outputNames, nil
 		}
 		o.knownObjects = o.argumentStore
-	case len(o.deleteCommand) > 0:
+	case len(o.deleteCommand) > 0, o.resyncPeriod > 0:
 		o.knownObjects = o.argumentStore
 	}