[EventCounters] Add example project

examples/event-counters/Examples.EventCounters/Examples.EventCounters.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="OpenTelemetry" Version="$(OpenTelemetryCoreLatestVersion)" />
+    <PackageReference Include="OpenTelemetry.Exporter.Console" Version="$(OpenTelemetryCoreLatestVersion)" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="$(RepoRoot)\src\OpenTelemetry.Instrumentation.EventCounters\OpenTelemetry.Instrumentation.EventCounters.csproj" />
+  </ItemGroup>
+
+</Project>

examples/event-counters/Examples.EventCounters/Program.cs

@@ -0,0 +1,41 @@
+// <copyright file="Program.cs" company="OpenTelemetry Authors">
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+
+using System.Diagnostics.Tracing;
+using OpenTelemetry;
+using OpenTelemetry.Metrics;
+
+// Create EventSources and EventCounters
+using EventSource eventSource = new("MyEventSource");
+using EventCounter eventCounter = new("MyEventCounter", eventSource);
+using PollingCounter pollingCounter = new("MyPollingCounter", eventSource, () => new Random().NextDouble());
+
+// Create and Configure Meter Provider
+using var meterProvider = Sdk.CreateMeterProviderBuilder()
+    .AddEventCountersInstrumentation(options =>
+    {
+        options.AddEventSources(eventSource.Name);
+        options.RefreshIntervalSecs = 1;
+    })
+    .AddConsoleExporter()
+    .Build();
+
+// Write to EventCounters
+eventCounter.WriteMetric(0);
+eventCounter.WriteMetric(1000);
+
+// Wait for EventCounter data to be polled (RefreshIntervalSecs is 1 second by default)
+Thread.Sleep(1200);

examples/event-counters/Examples.EventCounters/README.md

@@ -0,0 +1,21 @@
+# EventCounters Instrumentation for OpenTelemetry .NET - Examples
+
+This is an all-in-one sample that shows how to publish EventCounters using
+the OpenTelemetry Metrics Api.
+
+## Expected Output
+
+After running `dotnet run` from this directory
+
+```text
+Resource associated with Metric:
+    service.name: unknown_service:Examples.EventCounters
+
+Export EventCounters.MyEventSource.MyEventCounter, Meter: OpenTelemetry.Instrumentation.EventCounters/1.0.0.0
+(2022-11-01T17:37:37.9046769Z, 2022-11-01T17:37:38.4014060Z] DoubleGauge
+Value: 500
+
+Export EventCounters.MyEventSource.MyPollingCounter, Meter: OpenTelemetry.Instrumentation.EventCounters/1.0.0.0
+(2022-11-01T17:37:37.9076414Z, 2022-11-01T17:37:38.4014299Z] DoubleGauge
+Value: 0.5233669819037192
+```

opentelemetry-dotnet-contrib.sln

@@ -243,6 +243,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "OpenTelemetry.Instrumentati
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "process-instrumentation", "examples\process-instrumentation\process-instrumentation.csproj", "{C3B3BBAF-CC38-4D5C-AFA2-33184D07BF75}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Examples.EventCounters", "examples\event-counters\Examples.EventCounters\Examples.EventCounters.csproj", "{BA58CC8B-F5CA-4DC7-A3A8-D01B2E10731E}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -509,6 +511,10 @@ Global
 		{C3B3BBAF-CC38-4D5C-AFA2-33184D07BF75}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{C3B3BBAF-CC38-4D5C-AFA2-33184D07BF75}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{C3B3BBAF-CC38-4D5C-AFA2-33184D07BF75}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BA58CC8B-F5CA-4DC7-A3A8-D01B2E10731E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BA58CC8B-F5CA-4DC7-A3A8-D01B2E10731E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BA58CC8B-F5CA-4DC7-A3A8-D01B2E10731E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BA58CC8B-F5CA-4DC7-A3A8-D01B2E10731E}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -587,6 +593,7 @@ Global
 		{0F18B7C8-B192-4236-9578-7AD02BFC7128} = {2097345F-4DD3-477D-BC54-A922F9B2B402}
 		{B40B975E-78B2-4712-8B4D-BADA67DF0C0A} = {22DF5DC0-1290-4E83-A9D8-6BB7DE3B3E63}
 		{C3B3BBAF-CC38-4D5C-AFA2-33184D07BF75} = {B75EE478-97F7-4E9F-9A5A-DB3D0988EDEA}
+		{BA58CC8B-F5CA-4DC7-A3A8-D01B2E10731E} = {B75EE478-97F7-4E9F-9A5A-DB3D0988EDEA}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {B0816796-CDB3-47D7-8C3C-946434DE3B66}

src/OpenTelemetry.Instrumentation.EventCounters/README.md

@@ -11,6 +11,9 @@ using OpenTelemetry Metrics API.
 
 ## Steps to enable OpenTelemetry.Instrumentation.EventCounters
 
+You can view an example project using event counters at
+`/examples/event-counters/Examples.EventCounters`.
+
 ### Step 1: Install Package
 
 Add a reference to the