Help with iRule logging to local0.

Try this to start with. I've removed your cookie persist section as this didn't match the required syntax. See https://devcentral.f5.com/wiki/iRules.persist.ashx for details. You don't need to configure persistence with an iRule, add a cookie persistence profile to the virtual server

when HTTP_REQUEST { 
    if { [HTTP::path] starts_with "/media" } { 
        pool  
        log local0. "media.com_28080 TCP_logging fired, from [IP::client_addr]" 
    } 
}