goodhistogram: add PrometheusCollector for registry integration#2
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angles-n-daemons wants to merge 2 commits intomainfrom
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goodhistogram: add PrometheusCollector for registry integration#2angles-n-daemons wants to merge 2 commits intomainfrom
angles-n-daemons wants to merge 2 commits intomainfrom
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Add a thin PrometheusCollector wrapper that implements prometheus.Collector, allowing a goodhistogram to be registered directly with a Prometheus registry for scraping. Recording remains on the Histogram itself; the collector only participates in the export path, adding zero overhead to the hot path. Co-Authored-By: roachdev-claude <roachdev-claude-bot@cockroachlabs.com>
Add HistogramVec, a label-partitioned collection of Histograms that implements prometheus.Collector. WithLabelValues returns a *Histogram for direct int64 recording on the hot path; the vec handles Prometheus registration and scrape-time export with label pairs. Co-Authored-By: roachdev-claude <roachdev-claude-bot@cockroachlabs.com>
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Summary
PrometheusCollectortype that implementsprometheus.Collector, allowing a*Histogramto be registered with a Prometheus registry viah.ToPrometheusCollector(desc).*Histogramdirectly — the collector only participates in the scrape path, adding zero overhead to the hot path.Test plan
go build ./...passesgo test ./...passes