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[SPARK-37497][K8S] Promote `ExecutorPods[PollingSnapshot|WatchSnapsho…
…t]Source` to DeveloperApi ### What changes were proposed in this pull request? This PR aims to promote `ExecutorPodsWatchSnapshotSource` and `ExecutorPodsPollingSnapshotSource` as **stable** `DeveloperApi` in order to maintain it officially in a backward compatible way at Apache Spark 3.3.0. ### Why are the changes needed? - Since SPARK-24248 at Apache Spark 2.4.0, `ExecutorPodsWatchSnapshotSource` and `ExecutorPodsPollingSnapshotSource` have been used to monitor executor pods without any interface changes for over 3 years. - Apache Spark 3.1.1 makes `Kubernetes` module GA and provides an extensible external cluster manager framework. New `ExternalClusterManager` for K8s environment need to depend on this to monitor pods. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? Manual review. Closes #34751 from dongjoon-hyun/SPARK-37497. Authored-by: Dongjoon Hyun <[email protected]> Signed-off-by: Dongjoon Hyun <[email protected]> (cherry picked from commit 2b04496) Signed-off-by: Dongjoon Hyun <[email protected]>
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