Services

SNMP

Install SNMP agent

Get-WindowsCapability  -Online -Name "SNMP*"
Add-WindowsCapability  -Online -Name "SNMP.Client~~~~0.0.1.0"

GPO

Computer Configuration/Policies/Administrative Templates/Network/SNMP -> community,permitted managers
Computer Configuration/Preferences/Control Panel Settings/Services/SNMP -> Start service

Registry

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SNMP\Parameters\RFC1156Agent\sysContact type="REG_SZ" value="contact@contoso.com"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SNMP\Parameters\RFC1156Agent\sysLocation type="REG_SZ" value="contoso.com HQ"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SNMP\Parameters\RFC1156Agent\sysServices type="REG_DWORD" value="00000049"

00000049 (hexadecimal) is:
Physical
Applications
End-to-end

https://andys-tech.blog/2021/03/install-snmp-on-windows-server-core/