Improve the left-side label of the graph.

plugins/system/total_by_process_

@@ -92,6 +92,7 @@ if (@ARGV and $ARGV[1] == "config")
 graph_title $fieldname by Process
 graph_category system
 graph_info Shows total of $fieldname (reported by ps) for each process name
+graph_vlabel $fieldname (from ps)
 END
 
 	# graph_args --base 1000