• Kubernetes Submit Queue's avatar
    Merge pull request #59170 from cofyc/fix_kubelet_volume_metrics · bfdd94c6
    Kubernetes Submit Queue authored
    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>.
    
    Fix kubelet PVC stale metrics
    
    **What this PR does / why we need it**:
    
    Volumes on each node changes, we should not only add PVC metrics into
    gauge vector. It's better use a collector to collector metrics from internal
    stats.
    
    Currently, if a PV (bound to a PVC `testpv`)  is attached and used by node A, then migrated to node B or just deleted from node A later.  `testpvc` metrics will not disappear from kubelet on node A. After a long running time, `kubelet` process will keep a lot of stale volume metrics in memory.
    
    For these dynamic metrics, it's better to use a collector to collect metrics from a data source (`StatsProvider` here), like [kube-state-metrics](https://github.com/kubernetes/kube-state-metrics) scraping metrics from kube-apiserver.
    
    **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 https://github.com/kubernetes/kubernetes/issues/57686
    
    **Special notes for your reviewer**:
    
    **Release note**:
    
    ```release-note
    Fix kubelet PVC stale metrics
    ```
    bfdd94c6
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