$select application_name,    pg_size_pretty(pg_wal_lsn_diff(pg_current_wal_lsn(), sent_lsn)) send_lag,    pg_size_pretty(pg_wal_lsn_diff(sent_lsn, replay_lsn)) replay_lag,    replay_lagfrom pg_stat_replication;$select slot_name, slot_type, active,    case when not pg_is_in_recovery() then pg_size_pretty(pg_current_wal_lsn()- restart_lsn) endas current_lag_bytes,

Install dictionaries

CREATE EXTENSION hunspell_en_us;CREATE EXTENSION hunspell_ru_ru;