Meta store backend requirements

[maingoh]

Hello,

What would be the minimal requirements for the meta store backend (postgresql) for production use (memory and vcpu) ?
What are the factors influencing the specs ?

Finally what are the impacts of a slow or unavailable meta store on risingwave ?

It could be helpful to add it to the documentation here https://docs.risingwave.com/deploy/hardware-requirements#meta-nodes :)

Thank you for this awesome project !