How to get traffic throughput per second for a POOL in iRule

Hello guys,

I'm looking for a way to sample traffic going through two pools, aggregate it and check if the result is lower than a certain numeric number in Byte/Kbyte/Mbyte.

Basically, I'm looking for a syntax representation of the first line at the following syntax:

"If traffic (pool POOL1 + pool POOL2) < 900MB"

if { [class match [ip::client_addr] equals YOUTUBE] }

pool POOL1

Thanks,

Yevgeny