registration metric with desc

src/metrics.rs

@@ -39,10 +39,11 @@ impl MetricsProcesser {
     pub fn gauge_from_number(
         metric: &MetricOutput,
         metric_name: &str,
+        metric_desc: &str
     ) -> Option<Gauge> {        
         let gauge = Gauge::new(
             metric_name,
-            &metric.id
+            metric_desc
         );
 
         match gauge {