Remove unused *prometheus.Desc return value from collectors collect() function (#1475)

exporter.go

@@ -184,7 +184,7 @@ func main() {
 		w.Header().Set("Content-Type", "application/json")
 		_, err := fmt.Fprintln(w, `{"status":"ok"}`)
 		if err != nil {
-			_ = level.Debug(logger).Log("Failed to write to stream", "err", err)
+			_ = level.Debug(logger).Log("msg", "Failed to write to stream", "err", err)
 		}
 	})
 	mux.HandleFunc("/version", func(w http.ResponseWriter, r *http.Request) {