Automatic merge from submit-queue
Avoid unnecessary decoding in etcd3 client
Ref https://github.com/kubernetes/kubernetes/issues/33653
With the "Cacher" layer in Kubernetes, most of the watches processed by "pkg/storage/etcd3/watcher.go" have "filter = Everything()". That said, we generally don't need to decode previous value of the object (which is used only to get the value of filter of it), because we already know it will be true.
This PR is basically fixing this problem.
Should be merged after https://github.com/kubernetes/kubernetes/pull/34246
b65a07b204