zpool upgrade

Do not blindly upgrade boot volume when grub is used. Grub support limited set of zpool features! Or use systemd-boot and EFI partition.

~# zpool status nvmpool
 
status: Some supported features are not enabled on the pool. The pool can
	still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
	the pool may no longer be accessible by software that does not support
	the features. See zpool-features(5) for details.

zpool upgrade -v

# zpool upgrade
This system supports ZFS pool feature flags.
 
All pools are formatted using feature flags.
 
 
Some supported features are not enabled on the following pools. Once a
feature is enabled the pool may become incompatible with software
that does not support the feature. See zpool-features(5) for details.
 
POOL  FEATURE
---------------
nvmpool
      redaction_bookmarks
      redacted_datasets
      bookmark_written
      log_spacemap
      livelist
      device_rebuild
      zstd_compress

Perform upgrade:

zpool upgrade nvmpool