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    Merge pull request #56206 from brancz/top-metrics-s · 3cbb62b6
    Kubernetes Submit Queue authored
    Automatic merge from submit-queue (batch tested with PRs 56206, 58525). 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>.
    
    kubectl: Use metrics-server for kubectl top commands
    
    **What this PR does / why we need it**:
    
    This PR implements support for the kubectl top commands to use the metrics-server as an aggregated API, instead of requesting the metrics from heapster directly. If the `metrics.k8s.io` API is not served by the apiserver, then this still falls back to the previous behavior.
    
    **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
    
    Fixes #55489
    
    **Special notes for your reviewer**:
    
    As utilizing heapster as well as the v1alpha1 version of the metrics API is discouraged, I intentionally implemented the support very separated, so that once it is decided, that support is entirely removed, this will make it easy.
    
    **Release note**:
    
    ```release-note
    Support metrics API in `kubectl top` commands.
    ```
    
    /cc @kubernetes/sig-instrumentation-pr-reviews @DirectXMan12 @fgrzadkowski @piosz
    3cbb62b6
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