src/pgperf/91/pg_stat_replication.sql

SELECT 0::int as sid,
       procpid,
       usesysid,
       usename,
       application_name,
       client_addr,
       client_hostname,
       client_port,
       backend_start,
       state,
       sent_location,
       write_location,
       flush_location,
       replay_location,
       sync_priority,
       sync_state
  FROM pg_stat_replication;