Test configuration via IConfiguration

.github/workflows/package-Instrumentation.EventCounters.yml

@@ -0,0 +1,49 @@
+name: Pack OpenTelemetry.Contrib.Instrumentation.EventCounters
+
+on:
+  workflow_dispatch:
+    inputs:
+      logLevel:
+        description: 'Log level'
+        required: true
+        default: 'warning'
+  push:
+    tags:
+      - 'Instrumentation.EventCounters-*' # trigger when we create a tag with prefix "Instrumentation.AWS-"
+
+jobs:
+  build-test-pack:
+    runs-on: ${{ matrix.os }}
+    env:
+      PROJECT: OpenTelemetry.Contrib.Instrumentation.EventCounters
+
+    strategy:
+      matrix:
+        os: [windows-latest]
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0 # fetching all
+
+    - name: Install dependencies
+      run: dotnet restore
+
+    - name: dotnet build ${{env.PROJECT}}
+      run: dotnet build src/${{env.PROJECT}} --configuration Release --no-restore -p:Deterministic=true
+
+    - name: dotnet test ${{env.PROJECT}}
+      run: dotnet test test/${{env.PROJECT}}.Tests
+
+    - name: dotnet pack ${{env.PROJECT}}
+      run: dotnet pack src/${{env.PROJECT}} --configuration Release --no-build
+
+    - name: Publish Artifacts
+      uses: actions/upload-artifact@v2
+      with:
+        name: ${{env.PROJECT}}-packages
+        path: '**/${{env.PROJECT}}/bin/**/*.*nupkg'
+
+    - name: Publish Nuget
+      run: |
+        nuget push **/${{env.PROJECT}}/bin/**/*.nupkg -Source https://api.nuget.org/v3/index.json -ApiKey ${{ secrets.NUGET_TOKEN }} -SymbolApiKey ${{ secrets.NUGET_TOKEN }}

.github/workflows/pr_build.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false  # ensures the entire test matrix is run, even if one permutation fails
       matrix:
         os: [windows-latest,ubuntu-latest]
-        version: [net461,netcoreapp2.1,netcoreapp3.1,net5.0]
+        version: [net461,netcoreapp2.1,netcoreapp3.1,net5.0,net6.0]
         exclude:
           - os: ubuntu-latest
             version: net461
@@ -29,4 +29,4 @@ jobs:
       run: dotnet build --configuration Release --no-restore
 
     - name: Test
-      run: dotnet test **/bin/**/${{ matrix.version }}/*.Tests.dll
+      run: dotnet test **/bin/**/${{ matrix.version }}/*.Tests.dll

src/OpenTelemetry.Contrib.Instrumentation.EventCounters/README.md

@@ -63,6 +63,73 @@ namespace DotnetMetrics
 }
 ```
 
+Configuration can be done completely using the IConfiguration.
+
+```json
+{
+    "Telemetry": {
+        "RefreshIntervalSecs": 55,
+        "Sources": [
+            {
+                "EventSourceName": "System.Runtime",
+                "EventCounters" : [
+                    {
+                        "Name": "cpu-usage",
+                        "Description": "Current CPU usage",
+                        "Type": "DoubleGauge"
+                    },
+                    {
+                        "Name": "working-set",
+                        "Description": "Process working set",
+                        "Type": "LongSum",
+                        "MetricName": "process_working_set"
+                    }
+                ]
+            },
+            {
+                "EventSourceName": "MyCustomSource",
+                "EventCounters" : [
+                    {
+                        "Name": "orders_submitted",
+                        "Description": "Number of submitted orders",
+                        "Type": "LongSum"
+                    }
+                ]
+            }
+        ]
+    }
+}
+```
+
+```csharp
+var builder = WebApplication.CreateBuilder(args);
+
+
+builder.Services.AddControllers();
+
+builder.Services.AddOpenTelemetryMetrics(
+                (meterBuilder) => meterBuilder
+                    .AddPrometheusExporter()
+                    .AddEventCounters(options =>
+                    {
+                        builder.Configuration.GetSection("Telemetry").Bind(options);                       
+                    }));
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+
+app.UseHttpsRedirection();
+
+app.UseAuthorization();
+
+app.MapControllers();
+
+app.UseOpenTelemetryPrometheusScrapingEndpoint();
+
+app.Run();
+```
+
 ## References
 
 * [OpenTelemetry Project](https://opentelemetry.io/)

test/OpenTelemetry.Contrib.Instrumentation.EventCounters.Tests/EventCountersOptionsTests.cs

@@ -0,0 +1,82 @@
+// <copyright file="EventCountersOptionsTests.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.IO;
+using System.Text;
+using Microsoft.Extensions.Configuration;
+using Xunit;
+
+namespace OpenTelemetry.Contrib.Instrumentation.EventCounters.Tests
+{
+    public class EventCountersOptionsTests
+    {
+        [Fact]
+        public void Can_Be_Read_From_Configuration()
+        {
+            var json = @"{
+            ""Telemetry"": {
+                ""RefreshIntervalSecs"": 55,
+                ""Sources"": [
+                    {
+                        ""EventSourceName"": ""System.Runtime"",
+                        ""EventCounters"" : [
+                            {
+                                ""Name"": ""cpu-usage"",
+                                ""Description"": ""Current CPU usage"",
+                                ""Type"": ""DoubleGauge""
+                            },
+                             {
+                                ""Name"": ""working-set"",
+                                ""Description"": ""Process working set"",
+                                ""Type"": ""LongSum"",
+                                ""MetricName"": ""process_working_set""
+                            }
+                        ]
+                    },
+                    {
+                        ""EventSourceName"": ""MyCustomSource"",
+                        ""EventCounters"" : [
+                            {
+                                ""Name"": ""orders_submitted"",
+                                ""Description"": ""Number of submitted orders"",
+                                ""Type"": ""LongSum""
+                            }
+                        ]
+                    }
+                ]
+            }
+}";
+
+            var configuration = new ConfigurationBuilder().AddJsonStream(new MemoryStream(Encoding.UTF8.GetBytes(json))).Build();
+
+            var options = configuration.GetSection("Telemetry").Get<EventCountersOptions>();
+            Assert.Equal(55, options.RefreshIntervalSecs);
+            Assert.Equal(2, options.Sources.Count);
+
+            Assert.Equal(2, options.Sources[0].EventCounters.Count);
+            Assert.Equal("System.Runtime", options.Sources[0].EventSourceName);
+
+            Assert.Equal("cpu-usage", options.Sources[0].EventCounters[0].Name);
+            Assert.Equal("Current CPU usage", options.Sources[0].EventCounters[0].Description);
+            Assert.Equal(OpenTelemetry.Metrics.MetricType.DoubleGauge, options.Sources[0].EventCounters[0].Type);
+
+            Assert.Equal("working-set", options.Sources[0].EventCounters[1].Name);
+            Assert.Equal("Process working set", options.Sources[0].EventCounters[1].Description);
+            Assert.Equal(OpenTelemetry.Metrics.MetricType.LongSum, options.Sources[1].EventCounters[0].Type);
+            Assert.Equal("process_working_set", options.Sources[0].EventCounters[1].MetricName);
+        }
+    }
+}

test/OpenTelemetry.Contrib.Instrumentation.EventCounters.Tests/OpenTelemetry.Contrib.Instrumentation.EventCounters.Tests.csproj

@@ -6,6 +6,7 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="6.0.0" />
         <PackageReference Include="Moq" Version="4.16.1" />
         <PackageReference Include="coverlet.collector" Version="1.3.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="$(MicrosoftNETTestSdkPkgVer)" />