Document Control Plane Scaling Risks

[mpstefan]

As a user of NGF
I want a guide to show me how to scale the control and/or data planes for NGF and why I might want to do that
So that I can scale NGF to fit the traffic level and criticality of my cluster.

Acceptance

• A how-to guide is created that explains:
  • Why you may want to scale the data plane vs creating another Gateway
  • How to scale the data plane
  • Why you may want to scale the control plane
  • How to scale the control plane
• Risk around scaling control plane is documented:
  • If nginx instances connect to a non-leader control plane pod, status of config apply won't be seen because only the leader can write statuses to Gateway resources