Add per-table insert/update counters to upsert metadata managers#18427

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priyen-stripe wants to merge 3 commits intoapache:masterfrom

priyen:more-upsert-metrics

Commits on May 5, 2026

Add UPSERT_NEW_KEYS_INSERTED and UPSERT_EXISTING_KEYS_UPDATED server metrics

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priyen
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Commits on May 6, 2026

Inline upsert metrics into compute() lambda, add UPSERT_KEYS_DELETED meter

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priyen
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Extract emitUpsertMetrics helper and rename metrics for consistency

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claude
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