[docs] enhanced the basic example
To protect people from starting their exporter multiple times, one has to evaluate the error returned by http.ListenAndServe().
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@ -59,7 +59,7 @@
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// // The Handler function provides a default handler to expose metrics
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// // via an HTTP server. "/metrics" is the usual endpoint for that.
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// http.Handle("/metrics", promhttp.Handler())
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// http.ListenAndServe(":8080", nil)
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// log.Fatal(http.ListenAndServe(":8080", nil))
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// }
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//
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//
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