…ease test (#58048) ## Summary This PR removes the `image_classification_chaos_no_scale_back` release test and its associated setup script (`setup_cluster_compute_config_updater.py`). This test has become non-functional and is no longer providing useful signal. ## Background The `image_classification_chaos_no_scale_back` release test was designed to validate Ray Data's fault tolerance when many nodes abruptly get preempted at the same time. The test worked by: 1. Running on an autoscaling cluster with 1-10 nodes 2. Updating the compute config mid-test to downscale to 5 nodes 3. Asserting that there are dead nodes as a sanity check ## Why This Test Is Broken After the removal of Parquet metadata fetching in #56105 (September 2, 2025), the autoscaling behavior changed significantly: - **Before metadata removal**: The cluster would autoscale more aggressively because metadata fetching created additional tasks that triggered faster scale-up. The cluster would scale past 5 nodes, then downscale, leaving dead nodes that the test could detect. - **After metadata removal**: Without the metadata fetching tasks, the cluster doesn't scale up fast enough to get past 5 nodes before the downscale happens. This means there are no dead nodes to detect, causing the test to fail. ## Why We're Removing It 1. **Test is fundamentally broken**: The test's assumptions about autoscaling behavior are no longer valid after the metadata fetching removal 2. **Not actively monitored**: The test is marked as unstable and isn't closely watched ## Changes - Removed `image_classification_chaos_no_scale_back` test from `release/release_data_tests.yaml` - Deleted `release/nightly_tests/setup_cluster_compute_config_updater.py` (only used by this test) ## Related See #56105 Fixes #56528 Signed-off-by: Balaji Veeramani <bveeramani@berkeley.edu>

Release test image_classification_chaos_no_scale_back failed #56528

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