Log dropped telemetry item count on shutdown

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/OtlpExporterOptions.cs

@@ -95,7 +95,7 @@ public OtlpExporterOptions()
         /// <summary>
         /// Gets or sets the max waiting time (in milliseconds) for the backend to process each span batch. The default value is 10000.
         /// </summary>
-        public int TimeoutMilliseconds { get; set; } = 10000;
+        public uint TimeoutMilliseconds { get; set; } = 10000;
 
         /// <summary>
         /// Gets or sets the export processor type to be used with the OpenTelemetry Protocol Exporter. The default value is <see cref="ExportProcessorType.Batch"/>.

test/OpenTelemetry.Exporter.OpenTelemetryProtocol.Tests/OtlpExporterOptionsTests.cs

@@ -69,6 +69,7 @@ public void OtlpExporterOptions_InvalidEndpointVariableOverride()
         public void OtlpExporterOptions_InvalidTimeoutVariableOverride()
         {
             Environment.SetEnvironmentVariable(OtlpExporterOptions.TimeoutEnvVarName, "invalid");
+            // negative value
 
             var options = new OtlpExporterOptions();
 
@@ -82,6 +83,9 @@ public void OtlpExporterOptions_SetterOverridesEnvironmentVariable()
             Environment.SetEnvironmentVariable(OtlpExporterOptions.HeadersEnvVarName, "A=2,B=3");
             Environment.SetEnvironmentVariable(OtlpExporterOptions.TimeoutEnvVarName, "2000");
 
+            // If your application is targeting .NET Core 3.1, and you are using an insecure (HTTP) endpoint, the following switch must be set before adding OtlpExporter.
+            // AppContext.SetSwitch("System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport", true);
+
             var options = new OtlpExporterOptions
             {
                 Endpoint = new Uri("http://localhost:200"),