Added sample code for App Insights Entra Auth

Author: devdeer-alex

AppInsightsEntraAuth/AppInsightsEntraAuth.slnx

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+<Solution>
+  <Project Path="src/SampleApp/SampleApp.csproj" />
+</Solution>

AppInsightsEntraAuth/README.md

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+# Application Insights with Entra ID authentication

AppInsightsEntraAuth/infrastructure/main.bicep

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+targetScope = 'subscription'

AppInsightsEntraAuth/infrastructure/resources.bicep

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+targetScope = 'resourceGroup'

AppInsightsEntraAuth/src/SampleApp/Controllers/TestController.cs

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+namespace codingfreaks.samples.AppInsightsEntraAuth.Controllers
+{
+    using Microsoft.AspNetCore.Mvc;
+
+    [ApiController]
+    [Route("[controller]")]
+    public class TestController : ControllerBase
+    {
+        #region constructors and destructors
+
+        public TestController(ILogger<TestController> logger)
+        {
+            Logger = logger;
+        }
+
+        #endregion
+
+        #region methods
+
+        [HttpGet]
+        public IActionResult Get()
+        {
+            Logger.LogInformation("Get was called.");
+            var result = new
+            {
+                Timestamp = DateTimeOffset.Now,
+                Message = "Hello",
+                AppInsights = new
+                {
+                    ConnectionString =
+                        Environment.GetEnvironmentVariable("APPLICATIONINSIGHTS_CONNECTION_STRING") ?? "-",
+                    AuthenticationString =
+                        Environment.GetEnvironmentVariable("APPLICATIONINSIGHTS_AUTHENTICATION_STRING") ?? "-"
+                }
+            };
+
+            return Ok(result);
+        }
+
+        #endregion
+
+        #region properties
+
+        private ILogger<TestController> Logger { get; }
+
+        #endregion
+    }
+}

AppInsightsEntraAuth/src/SampleApp/Program.cs

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+using Azure.Identity;
+using Azure.Monitor.OpenTelemetry.AspNetCore;
+
+var builder = WebApplication.CreateBuilder(args);
+builder.Services.AddControllers();
+builder.Services.AddOpenApi();
+builder.Services.AddOpenTelemetry()
+    .UseAzureMonitor(options =>
+    {
+        if (builder.Environment.IsProduction())
+        {
+            options.Credential = new ManagedIdentityCredential(new ManagedIdentityCredentialOptions());
+        }
+        else
+        {
+            // DON'T DO THIS BECAUSE IT ONLY WORKS IN VS!!!
+            //options.Credential = new DefaultAzureCredential();
+        }
+    });
+var app = builder.Build();
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
+app.UseHttpsRedirection();
+app.UseAuthorization();
+app.MapControllers();
+app.Run();

AppInsightsEntraAuth/src/SampleApp/Properties/launchSettings.json

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+{
+    "$schema": "https://json.schemastore.org/launchsettings.json",
+    "profiles": {
+        "https": {
+            "commandName": "Project",
+            "dotnetRunMessages": true,
+            "launchBrowser": false,
+            "applicationUrl": "https://localhost:7028",
+            "environmentVariables": {
+                "ASPNETCORE_ENVIRONMENT": "Development",
+                "APPLICATIONINSIGHTS_CONNECTION_STRING": "InstrumentationKey=98074d8a-276c-4cdc-9a4b-24540b763a86;IngestionEndpoint=https://westeurope-5.in.applicationinsights.azure.com/;LiveEndpoint=https://westeurope.livediagnostics.monitor.azure.com/;ApplicationId=6b63afe9-6105-4149-83fd-8c3198962d70",
+                "APPLICATIONINSIGHTS_AUTHENTICATION_STRING": "Authorization=AAD"
+            }
+        }
+    }
+}

AppInsightsEntraAuth/src/SampleApp/SampleApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+    <PropertyGroup>
+        <RootNamespace>codingfreaks.samples.AppInsightsEntraAuth</RootNamespace>
+        <AssemblyName>AppInsightsEntraAuth</AssemblyName>
+        <TargetFramework>net10.0</TargetFramework>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+    </PropertyGroup>
+    <ItemGroup>
+        <PackageReference Include="Azure.Identity" Version="1.21.0" />
+        <PackageReference Include="Azure.Monitor.OpenTelemetry.AspNetCore" Version="1.4.0" />
+        <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="10.0.7" />
+    </ItemGroup>
+</Project>

AppInsightsEntraAuth/src/SampleApp/appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}