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[PR #541/cdfe60de backport][0.34] [PULP-2474] Optimize Maven repository metrics counts - #542
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This is a backport of PR #541 as merged into main (cdfe60d).
The repository metrics endpoint runs three separate COUNT(DISTINCT) queries over MavenPackage content. Combine them into one Django aggregate query using PostgreSQL row-valued DISTINCT expressions.
This preserves the API and exact results while reducing production-scale GABI latency from about 9.4–9.8s to 3.6–3.8s under three concurrent requests.
Tests: