Rsync "PULL" task for ... failed

[csjjpm]

Hi,
I upgraded from 11.2u7, via 11.2u8, to 11.3u1 last night. It all went well and everything appears to be working fantastic.
However, I got a tonne of emails overnight:
New feature flags are available for volume WD20EARS. Refer to the "Upgrading a ZFS Pool" subsection in the User Guide "Installing and Upgrading" chapter and "Upgrading" section for more instructions.

Normally I find a button somewhere to press to update the new ZFS feature but I cant find one. I've read the documentation and tried stuff in the shell:
zpool upgrade "POOL"
and it tells me I have spacemap_v2

Would someone please point me in the right direction to the documentation to enable the new feature/s. I understand I cannot go back to a previous release train once this is done.

Thanks
Paul

 

[csjjpm]

I've found the instructions here but I am not getting the option to 'Upgrade Pool'

2. Installing and Upgrading — FreeNAS®11.3-U1 User Guide Table of Contents

www.ixsystems.com

 

[csjjpm]

I'm still getting these 'CRITICAL' alerts

CRITICAL
Rsync "PULL" task for "/mnt/WD20EARS" failed.
Thu, 27 Feb 2020 02:46:15 PM (Europe/London)

 

[csjjpm]

I looked at the remote host in the rsync task on my network and it was 192.168x.14 and I don't have any host of that address on my router. I've disabled the task.