feat: add per-repo fetch/serve latency histograms - #23
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Add two duration histograms alongside the existing counters:
upstream_duration_seconds{op,repo} for clone/fetch, and
serve_duration_seconds{kind,repo} for the info/refs advertisement and
the upload-pack packfile stream (timed to EOF via a reader wrapper).
Observed only on success, matching the counters' bounded-repo labels.
Assisted-by: Claude:claude-opus-4-8
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #23 +/- ##
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+ Coverage 95.51% 95.92% +0.40%
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Files 5 5
Lines 870 957 +87
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+ Hits 831 918 +87
Misses 39 39 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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What kind of change does this PR introduce?
Summary
Add duration histograms:
upstream_duration_seconds{op,repo}for clone/fetch.serve_duration_seconds{kind,repo}for the info/refs advertisement and the upload-pack packfile streamTests
Checklist
cargo fmt --all --check,cargo clippy --all-targets --all-features --locked -- -D warnings,cargo test --all-featuresAssisted-by:trailer (see CONTRIBUTING.md / AGENTS.md)Breaking change?
N/A.