Logging the home server in post_proxy logs

Hi, I have have 4 home servers configured which radius request are proxied to using type = fail-over and would like to log which home server handle a request at any given time. In the Post proxy logs: detail post_proxy_log { detailfile = ${radacctdir}/%d/post-proxy-detail-%H:00 header = "%{NAS-IP-Address} - %t" detailperm = 0600 } Is there a way to log which server handled the proxy in this log or even the main radiusd.conf log? Thanks