# On the master
select * from pg_stat_replication ;
-[ RECORD 1 ]----+----------------------------------------------
pid              | 5399
usesysid         | 16387
usename          | replication
application_name | walreceiver
client_addr      | XXXXXXXXXXXX
client_hostname  | XXXXXXXXXXXX
client_port      | 56780
backend_start    | 2018-11-05 10:18:50.280663+00
backend_xmin     |
state            | streaming
sent_lsn         | 71/E3000000
write_lsn        | 71/E3000000
flush_lsn        | 71/E3000000
replay_lsn       | 71/E3000000
write_lag        |
flush_lag        |
replay_lag       |
sync_priority    | 0
sync_state       | async
-[ RECORD 2 ]----+----------------------------------------------
pid              | 10175
usesysid         | 16389
usename          | barman_replication
application_name | barman_receive_wal
client_addr      | XXXXXXXXXXXX
client_hostname  | XXXXXXXXXXXX
client_port      | 42572
backend_start    | 2018-11-12 03:09:03.715933+00
backend_xmin     |
state            | streaming
sent_lsn         | 71/E3000000
write_lsn        | 71/E3000000
flush_lsn        | 71/E3000000
replay_lsn       |
write_lag        | 00:00:02.516016
flush_lag        | 00:00:02.516016
replay_lag       | 06:28:11.482478
sync_priority    | 0
sync_state       | async

# On the standby
select * from pg_replication_slots ;
-[ RECORD 1 ]-------+------------
slot_name           | barman
plugin              |
slot_type           | physical
datoid              |
database            |
temporary           | f
active              | f
active_pid          |
xmin                |
catalog_xmin        |
restart_lsn         | 16/9F000000
confirmed_flush_lsn |