Automatic merge from submit-queue
etcd3 store: provide compactor util
What's this PR?
- Provides a util to compact keys in etcd.
Reason:
We want to save the most recent 10 minutes event history. It should be more than enough for slow watchers. It is not number based, so it can tolerate event bursts too. We do not want to save longer since the current storage API cannot take advantage of the multi-version key yet. We might keep a longer history in the future.
0a5d57a383