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The HTTP metrics recorder, the delivery collectors and the Go and process collectors now register on one prometheus.Registry that fx provides, instead of Prometheus's global default registry, and /metrics serves that registry. A second metrics-enabled router in one process, or the server tests run with -count=2, no longer panics on a duplicate registration. The middleware builds its recorder once, in New, so installing Metrics() on more than one router over the same graph is also safe; NewForTest gives its Middleware a recorder on a fresh registry. The scrape keeps the same series and labels, including go_*, process_* and promhttp_metric_handler_*. Model: opus-5-5
21 lines
596 B
Go
21 lines
596 B
Go
package handlers
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import (
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"net/http"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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// HandleMetrics returns the Prometheus scrape handler for the
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// registry every collector in this process registers on. It is what
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// promhttp.Handler builds for the global default registry, including
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// the promhttp_metric_handler_* series that count scrapes, pointed at
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// that registry instead.
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func (s *Handlers) HandleMetrics() http.HandlerFunc {
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reg := s.params.Registry
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return promhttp.InstrumentMetricHandler(
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reg, promhttp.HandlerFor(reg, promhttp.HandlerOpts{}),
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).ServeHTTP
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}
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