The night before I did have what seemed like a weird brown out in the house but it was 6+ hours prior to any alerts coming in. I never got an email alert for power failure and the disk failure emails I got were 4 hours after the time of the UPS power failure reported above. Disks are all on the same two PSUs plugged into the same UPS. Attached is the diagnostic bundle after a reboot.
What I've done so far:
Rebooted the array, both disks showed as disabled.
I ran SMART on both and they came back clean.
I removed the Parity Drive, started the array, stopped the array, added the parity drive back, and am rebuilding the parity drive.
diagnostics-20201101-0920.zip