Support customized OTLP endpoint for log example (#4066)

* Support customized OTLP endpoint for log example

* Add Endpoint command line option to TestMetrics

* Fix dotnet format

Co-authored-by: Alan West <3676547+alanwest@users.noreply.github.com>

examples/Console/Program.cs

@@ -112,6 +112,9 @@ namespace Examples.Console
         [Option("useExporter", Default = "console", HelpText = "Options include otlp or console.", Required = false)]
         public string UseExporter { get; set; }
 
+        [Option('e', "endpoint", HelpText = "Target to which the exporter is going to send metrics (default value depends on protocol).", Default = null)]
+        public string Endpoint { get; set; }
+
         [Option('p', "useGrpc", HelpText = "Use gRPC or HTTP when using the OTLP exporter", Required = false, Default = true)]
         public bool UseGrpc { get; set; }
     }
@@ -149,7 +152,7 @@ namespace Examples.Console
     [Verb("otlp", HelpText = "Specify the options required to test OpenTelemetry Protocol (OTLP)")]
     internal class OtlpOptions
     {
-        [Option('e', "endpoint", HelpText = "Target to which the exporter is going to send traces or metrics (default value depends on protocol).", Default = null)]
+        [Option('e', "endpoint", HelpText = "Target to which the exporter is going to send traces (default value depends on protocol).", Default = null)]
         public string Endpoint { get; set; }
 
         [Option('p', "protocol", HelpText = "Transport protocol used by exporter. Supported values: grpc and http/protobuf.", Default = "grpc")]
@@ -162,6 +165,9 @@ namespace Examples.Console
         [Option("useExporter", Default = "otlp", HelpText = "Options include otlp or console.", Required = false)]
         public string UseExporter { get; set; }
 
+        [Option('e', "endpoint", HelpText = "Target to which the OTLP exporter is going to send logs (default value depends on protocol).", Default = null)]
+        public string Endpoint { get; set; }
+
         [Option('p', "protocol", HelpText = "Transport protocol used by OTLP exporter. Supported values: grpc and http/protobuf. Only applicable if Exporter is OTLP", Default = "grpc")]
         public string Protocol { get; set; }
     }

examples/Console/TestLogs.cs

@@ -47,7 +47,7 @@ namespace Examples.Console
                          * Open another terminal window at the examples/Console/ directory and
                          * launch the OTLP example by running:
                          *
-                         *     dotnet run logs --useExporter otlp
+                         *     dotnet run logs --useExporter otlp -e http://localhost:4317
                          *
                          * The OpenTelemetry Collector will output all received logs to the stdout of its terminal.
                          *
@@ -58,28 +58,29 @@ namespace Examples.Console
                         // See: https://docs.microsoft.com/aspnet/core/grpc/troubleshoot#call-insecure-grpc-services-with-net-core-client
                         AppContext.SetSwitch("System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport", true);
 
+                        var protocol = OpenTelemetry.Exporter.OtlpExportProtocol.Grpc;
+
                         if (options.Protocol.Trim().ToLower().Equals("grpc"))
                         {
-                            opt.AddOtlpExporter(otlpOptions =>
+                            protocol = OpenTelemetry.Exporter.OtlpExportProtocol.Grpc;
-                            {
-                                otlpOptions.Protocol = OpenTelemetry.Exporter.OtlpExportProtocol.Grpc;
-                            });
                         }
                         else if (options.Protocol.Trim().ToLower().Equals("http/protobuf"))
                         {
-                            opt.AddOtlpExporter(otlpOptions =>
+                            protocol = OpenTelemetry.Exporter.OtlpExportProtocol.HttpProtobuf;
-                            {
-                                otlpOptions.Protocol = OpenTelemetry.Exporter.OtlpExportProtocol.HttpProtobuf;
-                            });
                         }
                         else
                         {
                             System.Console.WriteLine($"Export protocol {options.Protocol} is not supported. Default protocol 'grpc' will be used.");
+                        }
+
                         opt.AddOtlpExporter(otlpOptions =>
                         {
-                                otlpOptions.Protocol = OpenTelemetry.Exporter.OtlpExportProtocol.Grpc;
+                            otlpOptions.Protocol = protocol;
-                            });
+                            if (!string.IsNullOrWhiteSpace(options.Endpoint))
+                            {
+                                otlpOptions.Endpoint = new Uri(options.Endpoint);
                             }
+                        });
                     }
                     else
                     {

examples/Console/TestMetrics.cs

@@ -51,7 +51,7 @@ namespace Examples.Console
                  * Open another terminal window at the examples/Console/ directory and
                  * launch the OTLP example by running:
                  *
-                 *     dotnet run metrics --useExporter otlp
+                 *     dotnet run metrics --useExporter otlp -e http://localhost:4317
                  *
                  * The OpenTelemetry Collector will output all received metrics to the stdout of its terminal.
                  *
@@ -67,6 +67,11 @@ namespace Examples.Console
                     {
                         exporterOptions.Protocol = options.UseGrpc ? OtlpExportProtocol.Grpc : OtlpExportProtocol.HttpProtobuf;
 
+                        if (!string.IsNullOrWhiteSpace(options.Endpoint))
+                        {
+                            exporterOptions.Endpoint = new Uri(options.Endpoint);
+                        }
+
                         metricReaderOptions.PeriodicExportingMetricReaderOptions.ExportIntervalMilliseconds = options.DefaultCollectionPeriodMilliseconds;
                         metricReaderOptions.TemporalityPreference = options.IsDelta ? MetricReaderTemporalityPreference.Delta : MetricReaderTemporalityPreference.Cumulative;
                     });