Pool Testing is offline?

TrueNAS General
1

I get these notification emails. Why would pool testing be offline, and then why would scrub not run?

TrueNAS @ truenasmini

New alerts:
Pool Testing is offline, not running scrub.
Current alerts:
Pool Testing is offline, not running scrub.
2

We got to the bottom of it in the post Alert: “Pool Testing is offline.” Huh?.