Degraded zpool after failed PSU

[cookiemonster]

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#zpool attach {pool name} {new disk} but from your current setup of one disk, its ID is 4730808242311169367, so it has to be the new one.
So you could do a

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$zpool status again to show the disks in /dev/adaXX (in your case) to identify the current one; then use the new one from dmesg.