"Appliance is running low on memory. Add more memory to the machine", Memory exhaustion on vCenter Server Appliance 7.x (83824)
https://kb.vmware.com/s/article/83824
This issue is resolved in vCenter Server 7.0 U2c.
This kb didn’t solve the problem
Install the newest version of vCSA.
Install the newest version of vCSA.
I will reboot VCSA.