Foglight is Java based application. Please refer Enterprise Java Applications on VMware Best Practices Guide for more information.
This applies to the Foglight Management server (FMS) as well as Foglight Agent Manager (FGLAM)
We suggest you follow these best practices, additional best practices may apply as well.
BP1: VM sizing and VM-to-JVM ratio through a performance load test
BP5: Set memory reservation for virtual machine memory needs
BP7: Timekeeping Use NTP source