This does not seem to be a upgrade issue or related to Synology. I have been running brand new loads of 8.1.4 and I enabled ISCSI to an open-e ISCSI target yesterday and then it start for me as well. We had IP address restriction on the target because it kept trying to add the open-e management interface as a target since there is multiple ip addresses on the open-e server. Removed the iSCSI target, logged out of all ISCSI session, stopped iscsid, restarted rrdcached and graphs came back shortly after. So it seems to be that when there is multiple ip address to the target and it can't reach one of them is where the issue is. The graphs got cut of right at the time that I configure the ISCSI target in the cluster. No IPV6 involved.
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