feat: publish forget and prune metrics - #1857
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magrathean-uk wants to merge 3 commits into
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This was referenced Aug 1, 2026
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Summary
Publishes forget/prune timings, snapshot counts, and retention-reason gauges through configured metrics exporters.
Scope
This covers only the timing/count/retention portion of #1713. Raw-byte gauges are not included because the current core API does not expose exact raw totals at this layer.
Validation
cargo clippy --locked --all-targets --features release -- -D warningscargo fmt --all -- --checkgit diff --checktyposRelated to #1713.