iRule able to ask what Virtual it's running on?

You can use the virtual command to return the name of the VS

when HTTP_REQUEST {
    log local0. "Current virtual server name: [virtual name]"      
}

https://devcentral.f5.com/wiki/iRules.virtual.ashx

You can use [LB::server pool] to return the selected pool, assuming one has been selected.

when CLIENT_ACCEPTED {
   Save the name of the VIP's default pool
  set default_pool [LB::server pool]
}

https://devcentral.f5.com/wiki/iRules.LB__server.ashx

Hello,

you can do this simply (If in understand your need):

when HTTP_RESPONSE {
log local0. "VS Name: [virtual]"
serverside {
    log local0. "pool member IP: [serverside {IP::remote_addr}]:[serverside {IP::remote_port}]"
}

}

So using this irule you can retrieve Pool memeber that you reach an VS that you use for each request.

If you give me more details about your need keep me in touch.

Regards