Keeps the whole system log on the SD card across restarts, to find out why something went wrong (up to 64 MB; read it under Logs → Raspberry Pi). Writing it wears the card, so it turns itself off after 7 days.{% if dev_logging_until %} On until {{ dev_logging_until.strftime("%Y-%m-%d %H:%M") }} (switch it off and on again for 7 more days).{% endif %}