Not exactly sure to what you are referring, basically, I would test your key reload tasks to be sure they are still working and then check the key QVW files to be sure they open and function as expected. Other than that, the best I have at the moment is the following Help link which should give you some further overall guidance and best practices.
https://help.qlik.com/en-US/qlikview/April2019/Subsystems/Server/Content/QV_Server/QlikView-Server/Q...
The only other thing would be the Scalability area of Community:
https://community.qlik.com/t5/Qlik-Scalability/gp-p/qlik-scalability
Regards,
Brett
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