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a55c5e9ec7
The `describe_multi_item` function treated the last reference-captured argument as the number of used RCU half units. The caller `batch_get_item`, however, expected this parameter to hold an item size. This RCU value was then passed to `rcu_consumed_capacity_counter::get_half_units`, treating the already-calculated RCU integer as if it were a size in bytes. This caused a second conversion that undercounted the true RCU. During conversion, the number of bytes is divided by `RCU_BLOCK_SIZE_LENGTH` (=4KB), so the double conversion divided the number of bytes by 16 MB. The fix removes the second conversion in `describe_multi_item` and changes the API of `describe_multi_item`. Fixes: https://github.com/scylladb/scylladb/pull/25847 Closes scylladb/scylladb#25842