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[prometheus] Fixed a race condition happening in simultaneous OpenMetrics and PlainText requests #5517

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hez2010 wants to merge 31 commits into open-telemetry:main from hez2010:fix/prometheus_cursor

src/OpenTelemetry.Exporter.Prometheus.HttpListener/Internal/PrometheusCollectionManager.cs

-Original file line number
+Diff line change
@@ Expand Up / @@ -213,6 +213,10 @@ private ExportResult OnCollect(Batch<Metric> metrics) @@
                         }
                     }
                 }
+                else
+                {
+                    this.targetInfoBufferLength = -1;
+                }
                 foreach (var metric in metrics)
                 {
@@ Expand Down @@