You can get access to statistics in router’s administrative console via SHOW command. 
SHOW clients WHERE dbname = testdb;
  client_id   |   user   | dbname |       server_id       | router_address
--------------+----------+--------+-----------------------+----------------
 824660987840 | test_app | testdb | no backend connection | local
 824686914368 | test_app | testdb | no backend connection | local
 824656201120 | test_app | testdb | no backend connection | local
 824657328608 | test_app | testdb | example.com:6432      | local
 824656165344 | test_app | testdb | example.com:6432      | local
 824655861952 | test_app | testdb | no backend connection | local
(6 rows)
For more information, see SHOW command reference.