Just out of curiosity.
Do you have to install a service on your system which communicates with theirs?
Does it check if your system where HA is running is online, not HA itself?
No I just set up a rest command to ping the URL they provide every 5 minutes via an automation.
I set the time for check in interval for 5 minutes on their side and set the notification for 15 minutes of no ping.
Kind of both.
if HA is not alive then the ping never happens so it shows as down.
or if you have an issue with HA reaching the external URL due to an internet connectivity outage then it will also show as down.
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