Your F5 admin should be able to give you the stats about the connections directed.
However, you can use this query:
select fn.node_name, 'Number of user sessions : ' || count( distinct session_id) How_many_user_sessions
from icx_sessions icx,
where fn.node_id = icx.node_id
and (last_connect + decode(FND_PROFILE.VALUE('ICX_SESSION_TIMEOUT'), NULL,limit_time, 0,limit_time,FND_PROFILE.VALUE('ICX_SESSION_TIMEOUT')/60)/24) > sysdate
and disabled_flag != 'Y'
and PSEUDO_FLAG = 'N'
group by fn.node_name;
Let me know if you need any help!
Please mark it answered if you do not need any more clarifications on this. Thanks.