Nadav Har'El 70283967d3 alternator: add vector search metrics ...

Before this patch, we did not have any special metrics for vector search
in Alternator. We have had count of "Query" operations, but there was no
distinction between "standard" queries - of a base table or GSI/LSI -
and vector-search queries.

This patch adds four new metrics:

 * vector_search_query - counting how many Query requests are actually
   vector searches.

 * vector_search_query_returned_items - counting how many items were
   returned by vector searches.

 * vector_search_query_items_from_vs - counting how many results were
   retrieved from the vector-store backend.

 * vector_search_query_items_from_base_table - counting how many items
   were read from the base table during vector-search queries. Some
   vector search queries using SELECT=ALL_PROJECTED_ATTRIBUTES or COUNT
   are optimized to not need to read items from the base table.

This patch also includes documentation for the new four metrics, and
tests that they count what we want them to count.

Signed-off-by: Nadav Har'El <nyh@scylladb.com>

2026-05-13 11:57:44 +03:00

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