So I only briefly tested / played with Home Assistant so hopefully someone else can help with that. However, at my house I actually purposely put switches (smart switches) on some of these outlets like this so I could reset devices. Then since they are supposed to stay on, I created scenes to make sure they stay on. If they flipped off, the hub turns them back on automatically.
That might give you a quicker response too if it accidentally gets flipped off.
I like OhioYJ’s suggestion of a smart switch to alert you and turn back on.
Just to add to this: keep in mind if you joined it as powered, it likely is participating in your mesh (unless you joined it via LR?). If so, it powering off can create other issues with mesh stability if it is going offline periodically.
As for a Home Assistant solution, you could create an automation to actively monitor it. Here’s something that might work:
Create an automation to run every so often (my example below was every 15 secs just for this test, but you may want every 5 mins, etc - a balance of preference and keeping traffic and processing low).
At each run, send a Zwave Ping to the device. Then test for its status. If dead, send an alert.
Here’s the yaml of an example I just mocked up. Tested here with a ZSE70 on 12v dc. works well!