chore!: Remove index read cache and index cache validity settings - #22066
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The index read cache was only used by legacy boltdb-shipper. This commit removes any unused code and related configurations.
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…afana#22066) `boltdb-shipper`, the only index backend that used the index read cache (`-store.index-cache-read`) and index cache validity (`-store.index-cache-validity`), was previously removed. The corresponding cache infrastructure and configuration remained in place but was no longer exercised by any active code path (TSDB is the only supported index type).
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Summary
boltdb-shipper, the only index backend that used the index read cache (-store.index-cache-read) and index cache validity (-store.index-cache-validity), was previously removed. The corresponding cache infrastructure and configuration remained in place but was no longer exercised by any active code path (TSDB is the only supported index type).Caching documentation has already been updated with #21651