System monitoring for Windows servers?

Question

System administration

Good afternoon, We need something light and easy to configure for monitoring remote servers (we use ddns) under wines 2012r2, 2008r2.
Enough with the head of monitoring the CPU, RAM, HDD + if there is no access to the server, then send an email.
Thank you.

Answer 1

PRTG Network Monitor

Answer 2

+1 to PRTG. For those who are especially lazy, who, in order not to install extra software to use 1% of its functions, are ready to move mountains - monitoring on a powershell via get-wimobject -computername is written in minutes. For example, a piece from mine:
$disk = Get-WmiObject Win32_LogicalDisk -ComputerName ******** -Filter "DeviceID='C:'" |Select-Object Size,FreeSpace
$sized = $disk.FreeSpace/1GB
write- host "file dump - free $sized left"
well, we do whatever we want with the data.