Alert for swap memory


I want to create an alert about memory in one of my server.

I notice las week that I have some problems in one of my server, I reboot and the problem goes, so I check the LibreNMS console to see if there is any value that goes hight or low after the reboot. I see this in “Memory Pool Usage”:

How could I configure an alert when the Swap space goes over 20%?

I never create an alet, so I need newby explanation please.

Thanks for your help.

Kind regards.

Here is what I use for Virtual memory but you can just use Swap Space for the description

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