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Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.. [Federation] Hpa controller controls target objects This is in the series of PRs over https://github.com/kubernetes/kubernetes/pull/45993. The last commit is reviewable. Probably the last PR in this chain with e2e tests for relevant scenario, including the scenario created by this PR is soon to follow. **Special notes for your reviewer**: @kubernetes/sig-federation-pr-reviews @quinton-hoole **Release note**: ```NONE ```