Calculate Kbps per second

I'm sending apache logs to elasticsearch with network usage statistics
(bytes sent and bytes received - through mod_logiohttp://httpd.apache.org/docs/2.2/mod/mod_logio.html).
Before insert then into elasticsearch, logstash indexer is configured to
sum those two values into a single field called apache_bytes_sum.

I want to make a panel that informs what is the bandwith usage per second
(KBps or Kbps) for a given virtualhost. For do this, I've created a stats
panel with mean function over apache_bytes_sum field. To validate those
generated values, I have created another stats panel with total function over apache_bytes_sum
field to see if the other stats panel is calculating the average value
based on time (seconds), but, is doesn't.

Why not? How can I do it with stats panel or other panel?

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Any return?

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