Use application insights for logging

Author: Tsingis

App/Api/Api.csproj

@@ -6,11 +6,14 @@
     <PackageReference Include="Azure.Identity" />
     <PackageReference Include="Asp.Versioning.Mvc.ApiExplorer" />
     <PackageReference Include="DotNetEnv" />
+    <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" />
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" />
+    <PackageReference Include="Microsoft.Extensions.Logging.ApplicationInsights" />
     <PackageReference Include="Scalar.AspNetCore" />
     <PackageReference Include="Serilog" />
     <PackageReference Include="Serilog.Extensions.Hosting" />
     <PackageReference Include="Serilog.Settings.Configuration" />
+    <PackageReference Include="Serilog.Sinks.ApplicationInsights" />
     <PackageReference Include="Serilog.Sinks.Console" />
     <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" />
   </ItemGroup>

App/Api/Program.cs

@@ -15,26 +15,46 @@
 Log.Logger = new LoggerConfiguration()
     .ReadFrom.Configuration(config)
     .WriteTo.Console(outputTemplate: logFormat, formatProvider: CultureInfo.InvariantCulture)
-    .CreateLogger();
+    .CreateBootstrapLogger();
 
-var builder = WebApplication.CreateBuilder(args);
+try
+{
+    Log.Information("Starting up the application");
 
-var keyVaultName = Environment.GetEnvironmentVariable("KEY_VAULT_NAME");
+    var builder = WebApplication.CreateBuilder(args);
 
-if (!string.IsNullOrEmpty(keyVaultName))
-{
-    var keyVaultUri = new Uri($"https://{keyVaultName}.vault.azure.net/");
-    builder.Configuration.AddAzureKeyVault(keyVaultUri, new DefaultAzureCredential());
-}
+    if (builder.Environment.IsProduction())
+    {
+        var keyVaultName = Environment.GetEnvironmentVariable("KEY_VAULT_NAME");
+        var keyVaultUri = new Uri($"https://{keyVaultName}.vault.azure.net/");
+        builder.Configuration.AddAzureKeyVault(keyVaultUri, new DefaultAzureCredential());
 
-builder.Services.ConfigureServices();
+        Log.Logger = new LoggerConfiguration()
+            .ReadFrom.Configuration(config)
+            .WriteTo.Console(outputTemplate: logFormat, formatProvider: CultureInfo.InvariantCulture)
+            .WriteTo.ApplicationInsights(TelemetryConverter.Traces)
+            .CreateLogger();
+    }
 
-var app = builder.Build();
+    builder.Services.ConfigureServices();
 
-app.ConfigureEndpoints();
+    var app = builder.Build();
 
-app.ConfigureMiddleware(app.Environment);
+    app.ConfigureEndpoints();
 
-await app.RunAsync();
+    app.ConfigureMiddleware(app.Environment);
+
+    await app.RunAsync();
+}
+catch (Exception ex)
+{
+    const string message = "Application terminated unexpectedly";
+    Log.Fatal(ex, message);
+    throw new InvalidOperationException(message, ex);
+}
+finally
+{
+    await Log.CloseAndFlushAsync();
+}
 
 public partial class Program { } // Reference for tests

App/Api/Setup/ApiServices.cs

@@ -14,6 +14,8 @@ internal static class ApiServices
 {
     public static void ConfigureServices(this IServiceCollection services)
     {
+        services.AddApplicationInsightsTelemetry();
+
         services.AddSerilog();
 
         services.AddEndpointsApiExplorer();