Метрики на основе представления pg_stat_wal:
postgresql_wal_buffers_full_total
postgresql_wal_bytes_total
postgresql_wal_fpi_total
postgresql_wal_records_total
postgresql_wal_stats_reset_unixtime
postgresql_wal_sync_time_milliseconds_total
postgresql_wal_sync_total
postgresql_wal_write_time_milliseconds_total
postgresql_wal_write_total