MeshFaultInjection validation error message should be more specific

[slonka]

Description

apiVersion: kuma.io/v1alpha1
kind: MeshFaultInjection
metadata:
  name: default
  namespace: kong-mesh-system
  labels:
    kuma.io/mesh: default # optional, defaults to `default` if it isn't configured
spec:
  targetRef:
    kind: Mesh
  to:
    - targetRef:
        kind: MeshService
        name: httpbin
      default:
        http:
          - abort:
              httpStatus: 500
              percentage: 50

kubectl apply -f mfi.yaml
The MeshFaultInjection "default" is invalid: spec.from: must not be defined

the core question here is: why?

the answer is in the code: https://github.com/kumahq/kuma/blob/cf056262652a58535baedceeb91f2409d826ecbd/pkg/plugins/policies/meshfaultinjection/api/v1alpha1/validator.go#L48 it also targets gateways but just from the error code we don't know :(

[github-actions[bot]]

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