feat: add Prometheus HTTP metrics middleware#17
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Record method/status counters and latency histograms, and serve GET /metrics as Prometheus text exposition without counting scrapes. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
metrics_registry/metrics_middleware()forhttp_requests_totalandhttp_request_duration_seconds(labels:method,status)GET /metricswith Prometheus text exposition; scrapes are not counted[net]BDD coverage for counters, error status, and scrape isolationTest plan
./tools/CB.sh debug test "metrics_middleware"(12/12)Made with Cursor