Is there a way mango can report the total kilobytes transferred through a tcp connection in last 24 hours?
There's not a simple mechanism I'm aware of for this. The status outputs for the data source and publisher both output packet counts, which don't reflect actual transmitted bytes in all situations (some packets may have fewer values, some packets may have more effective compression, etc). I think if I needed to form a first order approximation of that, I would compare something like ifconfig output from one day to the next via an SSH data source or write that to a file via cron and use the ASCII source. Then the number would at least reflect actually transmitted byte counts instead of uncompressed byte counts.