ZFS ZFS: pool <pool name> vdev raidz1-0 using stale label from 0x<hex>, referred by 0x<hex>

I see this message when booting up the server, right before the "boot:" prompt.

The system boots successfully, and operates like normal, but this worries me that if something happens maybe it will bite me in the behind.

Any idea what does it mean and how to correct it? For the first time, I have hard time finding anybody getting a similar message.

I have a simple RAIDZ1 set up with 3 drives for the root disk, the disks are referenced by ZFS via GPT labels (perhaps that's what it is referring to?)
 
There was an old pool on the drive with the exact same name, labels are still on disk, so that import fails. I would do absolutely nothing. It's a small annoyance. Maybe once you deleted a partition without "zpool destroy" before.
 
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