I did it all in Node Red so unfortunately I can’t share the automation, but I can point you at this HACS integration https://github.com/meichthys/uptime_kuma
Set that up and all your nodes will be visible in HA then it’s just a case of “if node X is off for X minutes” - “notify”
What’s amusing is I’m long time stoner. As such, I have a shit memory. I do not remember writing this comment. Nor do I remember even struggling with this. I do know that I had a bunch of .crypt domains for a while.
So your comment is hilarious because I frequently find my own comments when I’m struggling through that thing I once did that I don’t remember, documenting what I did.
I do it to help others, I call it “leaving breadcrumbs for those further back on the path” but those breadcrumbs are great when a server dies and you have to re set it up.
Kudos for being a great guy and leaving breadcrumbs. Karma likes to remind you that you’re a wonderful person sometimes, so just enjoy it, and don’t let the bastards grind you down.
Rereading my own comment, I do this, I thank people hoping they’re still active at some point. I really do believe in thanking those that help me, even if they may not see it until 10 months later, if at all. You must have been the post that slotted it all into place.