Modify the refinery-dump-status-webrequest-partitions shell script to show percent loss instead of X. (script is already run daily via cron).
Difficulty: current script just checks whether success file is present to get actual numbers. You need to make hive report those. How? Execute hive via shell?
see: https://github.com/wikimedia/analytics-refinery/blob/master/bin/refinery-dump-status-webrequest-partitions#L461