ZFS pool out of space warning
Disk is almost full (< 10% left)
>>>
* 100 /
< 10 and ON (instance, device, mountpoint)
== 0
The alert triggers when a writable ZFS pool (zfs_pool_readonly == 0) has less than 10 % of its total capacity free, i.e., the expression zfs_pool_free_bytes * 100 / zfs_pool_size_bytes < 10 evaluates to true for the same instance, device, and mountpoint.
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