Check WAL status

Acrynite status

$acrynite wal status production

PostgreSQL archiver statistics

Inspect PostgreSQL's own archiver statistics to confirm segments are being archived:

SELECT
    archived_count,
    failed_count,
    last_archived_wal,
    last_archived_time,
    last_failed_wal,
    last_failed_time
FROM pg_stat_archiver;

Investigate a rising failure count or a stale successful-archive timestamp. A configured destination is not proof of continuous WAL archiving.