From 813894130e60adc85b614ea37276195bb547da8e Mon Sep 17 00:00:00 2001
From: Vishwesh Bankwar <vibankwa@microsoft.com>
Date: Fri, 11 Mar 2022 14:10:22 -0800
Subject: [PATCH 1/3] add aspnet metric example

---
 examples/AspNet/Global.asax.cs | 33 +++++++++++++++++++++++++++++++++
 examples/AspNet/Web.config     |  1 +
 2 files changed, 34 insertions(+)

diff --git a/examples/AspNet/Global.asax.cs b/examples/AspNet/Global.asax.cs
index ca4ad645aa5..c81ded79e7d 100644
--- a/examples/AspNet/Global.asax.cs
+++ b/examples/AspNet/Global.asax.cs
@@ -22,6 +22,7 @@
 using System.Web.Routing;
 using OpenTelemetry;
 using OpenTelemetry.Exporter;
+using OpenTelemetry.Metrics;
 using OpenTelemetry.Trace;
 
 namespace Examples.AspNet
@@ -31,6 +32,7 @@ public class WebApiApplication : HttpApplication
 #pragma warning restore SA1649 // File name should match first type name
     {
         private IDisposable tracerProvider;
+        private IDisposable meterProvider;
 
         protected void Application_Start()
         {
@@ -66,6 +68,36 @@ protected void Application_Start()
 
             this.tracerProvider = builder.Build();
 
+            // Metrics
+            // Note: Tracerprovider is needed for metrics to work
+
+            var meterBuilder = Sdk.CreateMeterProviderBuilder()
+                 .AddAspNetInstrumentation()
+                 .AddHttpClientInstrumentation();
+
+            switch (ConfigurationManager.AppSettings["UseMetricsExporter"].ToLowerInvariant())
+            {
+                case "otlp":
+                    meterBuilder.AddOtlpExporter(otlpOptions =>
+                    {
+                        otlpOptions.Endpoint = new Uri(ConfigurationManager.AppSettings["OtlpEndpoint"]);
+                    });
+                    break;
+                default:
+                    meterBuilder.AddConsoleExporter((exporterOptions, metricReaderOptions) =>
+                    {
+                        exporterOptions.Targets = ConsoleExporterOutputTargets.Debug;
+
+                        // The ConsoleMetricExporter defaults to a manual collect cycle.
+                        // This configuration causes metrics to be exported to stdout on a 10s interval.
+                        metricReaderOptions.MetricReaderType = MetricReaderType.Periodic;
+                        metricReaderOptions.PeriodicExportingMetricReaderOptions.ExportIntervalMilliseconds = 10000;
+                    });
+                    break;
+            }
+
+            this.meterProvider = meterBuilder.Build();
+
             GlobalConfiguration.Configure(WebApiConfig.Register);
 
             AreaRegistration.RegisterAllAreas();
@@ -75,6 +107,7 @@ protected void Application_Start()
         protected void Application_End()
         {
             this.tracerProvider?.Dispose();
+            this.meterProvider?.Dispose();
         }
     }
 }
diff --git a/examples/AspNet/Web.config b/examples/AspNet/Web.config
index c81722ba16a..d38c23bbfc6 100644
--- a/examples/AspNet/Web.config
+++ b/examples/AspNet/Web.config
@@ -6,6 +6,7 @@
 		<add key="ClientValidationEnabled" value="true"/>
 		<add key="UnobtrusiveJavaScriptEnabled" value="true"/>
 		<add key="UseExporter" value="console"/>
+        <add key="UseMetricsExporter" value="console"/>
 		<add key="JaegerHost" value="localhost"/>
 		<add key="JaegerPort" value="6831"/>
 		<add key="ZipkinEndpoint" value="http://localhost:9411/api/v2/spans"/>

From 794ab1496182498a81730fe02dd98dbfb060aea2 Mon Sep 17 00:00:00 2001
From: Vishwesh Bankwar <vibankwa@microsoft.com>
Date: Fri, 11 Mar 2022 14:28:23 -0800
Subject: [PATCH 2/3] indent

---
 examples/AspNet/Web.config | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/examples/AspNet/Web.config b/examples/AspNet/Web.config
index d38c23bbfc6..bd4f12f8b14 100644
--- a/examples/AspNet/Web.config
+++ b/examples/AspNet/Web.config
@@ -6,7 +6,7 @@
 		<add key="ClientValidationEnabled" value="true"/>
 		<add key="UnobtrusiveJavaScriptEnabled" value="true"/>
 		<add key="UseExporter" value="console"/>
-        <add key="UseMetricsExporter" value="console"/>
+		<add key="UseMetricsExporter" value="console"/>
 		<add key="JaegerHost" value="localhost"/>
 		<add key="JaegerPort" value="6831"/>
 		<add key="ZipkinEndpoint" value="http://localhost:9411/api/v2/spans"/>

From e78d815304819a1c5b2987a16a9e789dce9f717b Mon Sep 17 00:00:00 2001
From: Vishwesh Bankwar <vibankwa@microsoft.com>
Date: Fri, 11 Mar 2022 14:29:54 -0800
Subject: [PATCH 3/3] link to issue

---
 examples/AspNet/Global.asax.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/examples/AspNet/Global.asax.cs b/examples/AspNet/Global.asax.cs
index c81ded79e7d..b8e3759ac03 100644
--- a/examples/AspNet/Global.asax.cs
+++ b/examples/AspNet/Global.asax.cs
@@ -70,6 +70,7 @@ protected void Application_Start()
 
             // Metrics
             // Note: Tracerprovider is needed for metrics to work
+            // https://github.com/open-telemetry/opentelemetry-dotnet/issues/2994
 
             var meterBuilder = Sdk.CreateMeterProviderBuilder()
                  .AddAspNetInstrumentation()