Please, what does: select * from pg_stat_replication show on the primary?
root@cba9f6ba3f6e:/# cat ${PGDATA}/pg_xlog/00000001000000000000000C archive_status
root@ad4a83bdcf9e:/# cat ${PGDATA}/pg_xlog/00000001000000000000000500000001000000000000000600000001000000000000000700000001000000000000000800000001000000000000000900000001000000000000000A00000001000000000000000B00000001000000000000000C00000001000000000000000C.00000028.backup00000001000000000000000D00000001000000000000000Earchive_status
pgsql-general by date:
Соглашаюсь с условиями обработки персональных данных