documentation regarding how canary deployment behaves with different API version of the resources

[antonioberben]

From 1.9.0 we can have canary deployments.

It would be interesting to document how API versioning could be affected by canary deployment.

When performing a canary deployment, you will have a minimum of one pair of each component:

• 2 gloo deployments
• 2 gateway deployment
• 2 proxy resource
• 2 gateway proxy

But only one custom resources (i.e. VirtualService, RT, AuthConfig, ...) as you had it before running the deployment.

What would happen if the new release brings a change in the CRDs? How do the canary deployments (old version and new version) behave? can there be a possible conflict?

thank you

[Rachael-Graham]

Working on this in #5499