retryRemoteLocalities uses xds v2 API, broken on recent versions

[howardjohn]

apiVersion: networking.istio.io/v1beta1
kind: VirtualService
metadata:
  name: ratings-route
spec:
  hosts:
  - echo.default.svc.cluster.local
  http:
  - route:
    - destination:
        host: echo.default.svc.cluster.local
    retries:
      attempts: 3
      perTryTimeout: 2s
      retryOn: gateway-error,connect-failure,refused-stream
      retryRemoteLocalities: true

2021-06-30T15:23:13.908540Z     warning envoy config    gRPC config for type.googleapis.com/envoy.config.route.v3.RouteConfiguration rejected: The v2 xDS major version is deprecated and disabled by default. Support for v2 will be removed from Envoy at the start of Q1 2021. You may make use of v2 in Q4 2020 by following the advice in https://www.envoyproxy.io/docs/envoy/latest/faq/api/transition. (envoy.config.retry.previous_priorities.PreviousPrioritiesConfig)

The fix is easy but this indicates a clear testing gap

[pavanponugoti]

We have encountered this issue during Istio upgrade from 1.9.5 to 1.10.2. After removing retryRemoteLocalities from virtual services, ILBs started working.
Also, this link doesn't seem to exist: https://www.envoyproxy.io/docs/envoy/latest/faq/api/transition
Internal:The v2 xDS major version is deprecated and disabled by default. Support for v2 will be removed from Envoy at the start of Q1 2021. You may make use of v2 in Q4 2020 by following the advice in https://www.envoyproxy.io/docs/envoy/latest/faq/api/transition. (envoy.config.retry.previous_priorities.PreviousPrioritiesConfig)

[ramaraochavali]

Closing this as it is fixed