On the positive side, the repetitive error:
Apr 26 12:49:09
seveneves.gregandeva.net nut-monitor[326253]: Poll UPS [seveneves-ups@localhost] failed - Driver not connected
....is no longer happening
Looks like I spoke too soon; I noticed that the nut-monitor service had stopped running. I restarted it, and:
Apr 27 09:52:26
seveneves.gregandeva.net nut-monitor[11136]: Poll UPS [seveneves-ups@localhost] failed - Driver not connected
This is being logged every 5 seconds. So I'm more-or-less back to square one.
--Greg