fix: Use ResetOnReport when generated report for Prometheus

AppMetrics · Jan 16, 2019 · d975515 · d975515
1 parent a4c73a3
commit d975515
Showing 1 changed file with 10 additions and 2 deletions.
diff --git a/src/App.Metrics.Formatters.Prometheus/Internal/Extensions/MetricValueSourceExtensions.cs b/src/App.Metrics.Formatters.Prometheus/Internal/Extensions/MetricValueSourceExtensions.cs
@@ -51,6 +51,14 @@ public static IEnumerable<Metric> ToPrometheusMetrics(this GaugeValueSource metr
 
         public static IEnumerable<Metric> ToPrometheusMetrics(this CounterValueSource metric)
         {
+            IEnumerable<Metric> items = null;
+
+            // when We Resting counter, we lost Items "Count"
+            if (metric.Value.Items?.Length > 0)
+            {
+                items = metric.Value.Items.Select(i => i.ToPrometheusMetric());
+            }
+
             var result = new List<Metric>
                          {
                              new Metric
@@ -63,9 +71,9 @@ public static IEnumerable<Metric> ToPrometheusMetrics(this CounterValueSource me
                              }
                          };
 
-            if (metric.Value.Items?.Length > 0)
+            if (metric.Value.Items?.Length > 0 && items != null)
             {
-                result.AddRange(metric.Value.Items.Select(i => i.ToPrometheusMetric()));
+                result.AddRange(items);
             }
 
             return result;