Hi guys. For what it is worth, I use hetrixtools.com to monitor website status on my vps’s. They also have an incredibly useful cron script that monitors server metrics such as CPU load and you can setup notification if preset amounts are exceeded.
Pretty sure this limited the damage to servers by the recent attack as I had notification within 5 minutes of high CPU load across 3 Cyberpanel servers simultaneously.
Can’t recommend hetrixtools enough. And monitors up to 15 sites and servers absolutely free. I use ntfy as well for notification on my phone but does email and host of other notification types.