Is there a signal/event I can set up a listener/handler/callback for when a message is logged with journald? I need to print add'l diagnostic information at precisely the moment the message is produced. Specifically, my Raspberry Pi has been dying recently with the kernel producing message mmc0: PIO read timeout - EDM 10801 and I want to log a message immediately after which indicates if there's an undervoltage.
How to react to journald events err, crit, alert, emerg?
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