canary

Describe the bug

The documentation and some tests uses gw.ns(.svc.cluster.local) for gateways.

I think this is the correct format for istio gateways: <gateway namespace>/<gateway name>

Like here:

https://github.com/fluxcd/flagger/blob/273b05fb24d467c10939389218e6a8ec26d4c70e/test/istio/test-delegation.sh#L41

re. https://istio.io/latest/docs/reference/config/networking/virtua

Similar to deployment, Rollout should throw error and shouldn't create the object if the selector is not specified.

Current behavior:
Rollout object gets created with Error status

Expected behavior:
Rollout object shouldn't be allowed to create and throw a validation error

Following file doesn't have selector defined

apiVersion: argoproj.io/v1alpha1
kind: Rollout
metadata:
  n