Merge pull request #4423 from p0lyn0mial/kep-watch-list-update-ga-critiria

KEP 3157 (watch-list): add a GA critiera

Author: k8s-ci-robot

keps/sig-api-machinery/3157-watch-list/README.md

@@ -679,6 +679,9 @@ We expect no non-infra related flakes in the last month as a GA graduation crite
 - Consider using WatchProgressRequester to request progress notifications directly from etcd.
   This mechanism was developed in [Consistent Reads from Cache KEP](https://github.com/kubernetes/enhancements/tree/master/keps/sig-api-machinery/2340-Consistent-reads-from-cache#use-requestprogress-to-enable-automatic-watch-updates)
   and could reduce the overall latency for watchlist requests.
+- [Switch](https://github.com/kubernetes/kubernetes/blob/a07b1aaa5b39b351ec8586de800baa5715304a3f/staging/src/k8s.io/apiserver/pkg/storage/cacher/cacher.go#L416) 
+  the `storage/cacher` to use streaming directly from etcd 
+  (This will also allow us to [remove](https://github.com/kubernetes/kubernetes/blob/a07b1aaa5b39b351ec8586de800baa5715304a3f/staging/src/k8s.io/client-go/tools/cache/reflector.go#L110) the `reflector.UseWatchList` field).
 
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 **Note:** *Not required until targeted at a release.*