Merge pull request kubernetes#4453 from p0lyn0mial/kep-watch-list-update-beta-critiria

KEP 3157 (watch-list): add a new beta criterion

Author: k8s-ci-robot

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

@@ -674,6 +674,10 @@ We expect no non-infra related flakes in the last month as a GA graduation crite
   with data obtained through a standard list request. The detector will be added to the reflector 
   and activated when an environment variable is set. The environment variable will be set for all jobs run in the Kube CI. 
 - Update the client-go generated List function to watchList data when the feature gate has been enabled and the ListOptions are satisfied.
+- Implement a mechanism for automatically detecting etcd configuration
+  Whether it is safe to use the RequestWatchProgress API call 
+  or if the experimental-watch-progress-notify-interval flag has been set.
+  Knowing etcd configuration will be used to automatically disable the streaming feature.
 
 #### GA
 - Consider using WatchProgressRequester to request progress notifications directly from etcd.