I am not sure about the official document for this but each virtual machine has its own swap file which is going to be created when the VM is powered on which is equivalent to the size of the RAM allocated to VM and swap file is going to use the datastore space... so have atleast 10 -15% free space always to ensure smooth operations and again it depends on the number of virtual machines since all the VMs going to have its own swap file created. Since you have thick provisioned disk, do a calculation for memory overhead and take action accordinly. Hope this will help you. Cheers...
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