I can try and work on that.
But we use a 3rd party HetrixTools and install their Agent on the servers. And stopped using Netdata years ago.
They have a free level up to 15 Uptime Monitors and 32 Blacklist Monitors.
https://hetrixtools.com/They allow up to 9 services to be monitored also beside all the standard server monitors.
What they call 'Uptime Monitors' is actually a server, so 15 servers.
Alerts can be sent via multiple options, including SMS.
The Blacklist Monitors are nice also, they will monitor the RBL's for the IP's you have.
Usually you just put the servers base IPv4.