Reference:
https://longhorn.io/docs/1.5.3/snapshots-and-backups/csi-snapshot-support/enable-csi-snapshot-support/

It seems upstream has some problems with RWX volumes in longhorn 1.5.3
where share-mananger status isn't properly assessed and as a result not
restarted when single share-managers go down. The fix for now is to
manually patch the share-manager objects with an error state, which
triggers longhorn to repair itself.

In order to notice that, this alert triggers and allows to manually fix
the problem until a new upstream release is ready, that fixes the
problem.

References:
https://github.com/longhorn/longhorn/issues/7183#issuecomment-1823715359
https://github.com/longhorn/longhorn/wiki/Release-Known-Issues