Merge pull request 'fix(metrics): add cumulative count as histogram expects' (#57) from tn-fix-histogram-quantile-monotonicity into main

Reviewed-on: #57

internal/exporter/metrics.go

@@ -193,10 +193,12 @@ func (m *Metrics) collectReqeustDataMetrics(ch chan<- prometheus.Metric, queue *
 		sum += latency
 		count++
 
+		var cumulativeCount uint64
 		for _, bound := range bucketBounds {
 			if latency <= bound {
-				buckets[bound]++
+				cumulativeCount++
 			}
+			buckets[bound] += cumulativeCount
 		}
 	}