[sdk+hosting] Move AddOpenTelemetry & OpenTelemetryBuilder into Hosting package

docs/trace/getting-started-aspnetcore/Program.cs

@@ -15,7 +15,6 @@
 // </copyright>
 
 using System.Diagnostics;
-using OpenTelemetry;
 using OpenTelemetry.Resources;
 using OpenTelemetry.Trace;
 
@@ -27,8 +26,7 @@
         .AddService(serviceName: "OTel.NET Getting Started"))
     .WithTracing(builder => builder
         .AddAspNetCoreInstrumentation()
-        .AddConsoleExporter())
-    .StartWithHost();
+        .AddConsoleExporter());
 
 var app = appBuilder.Build();
 

examples/AspNetCore/Program.cs

@@ -15,7 +15,6 @@
 // </copyright>
 
 using Examples.AspNetCore;
-using OpenTelemetry;
 using OpenTelemetry.Exporter;
 using OpenTelemetry.Instrumentation.AspNetCore;
 using OpenTelemetry.Logs;
@@ -45,7 +44,7 @@
 appBuilder.Services.AddSingleton<Instrumentation>();
 
 // Configure OpenTelemetry tracing & metrics with auto-start using the
-// StartWithHost extension from OpenTelemetry.Extensions.Hosting.
+// AddOpenTelemetry extension from OpenTelemetry.Extensions.Hosting.
 appBuilder.Services.AddOpenTelemetry()
     .ConfigureResource(configureResource)
     .WithTracing(builder =>
@@ -127,8 +126,7 @@
                 builder.AddConsoleExporter();
                 break;
         }
-    })
-    .StartWithHost();
+    });
 
 // Clear default logging providers used by WebApplication host.
 appBuilder.Logging.ClearProviders();

examples/GrpcService/Startup.cs

@@ -14,7 +14,6 @@
 // limitations under the License.
 // </copyright>
 
-using OpenTelemetry;
 using OpenTelemetry.Resources;
 using OpenTelemetry.Trace;
 
@@ -61,8 +60,7 @@ public void ConfigureServices(IServiceCollection services)
                             builder.AddConsoleExporter();
                             break;
                     }
-                })
-                .StartWithHost();
+                });
         }
 
         public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

examples/MicroserviceExample/WebApi/Startup.cs

@@ -14,7 +14,6 @@
 // limitations under the License.
 // </copyright>
 
-using OpenTelemetry;
 using OpenTelemetry.Trace;
 using Utils.Messaging;
 
@@ -43,8 +42,7 @@ public void ConfigureServices(IServiceCollection services)
                     {
                         var zipkinHostName = Environment.GetEnvironmentVariable("ZIPKIN_HOSTNAME") ?? "localhost";
                         b.Endpoint = new Uri($"http://{zipkinHostName}:9411/api/v2/spans");
-                    }))
-                .StartWithHost();
+                    }));
         }
 
         public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

examples/MicroserviceExample/WorkerService/Program.cs

@@ -14,7 +14,6 @@
 // limitations under the License.
 // </copyright>
 
-using OpenTelemetry;
 using OpenTelemetry.Trace;
 using Utils.Messaging;
 
@@ -42,8 +41,7 @@ public static IHostBuilder CreateHostBuilder(string[] args) =>
                             {
                                 var zipkinHostName = Environment.GetEnvironmentVariable("ZIPKIN_HOSTNAME") ?? "localhost";
                                 b.Endpoint = new Uri($"http://{zipkinHostName}:9411/api/v2/spans");
-                            }))
-                        .StartWithHost();
+                            }));
                 });
     }
 }

src/OpenTelemetry.Exporter.Jaeger/README.md

@@ -98,8 +98,7 @@ services.AddOpenTelemetry()
                 client.DefaultRequestHeaders.Add("X-MyCustomHeader", "value");
                 return client;
             };
-        }))
-    .StartWithHost();
+        }));
 ```
 
 For users using

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/README.md

@@ -135,8 +135,7 @@ services.AddOpenTelemetry()
                 client.DefaultRequestHeaders.Add("X-MyCustomHeader", "value");
                 return client;
             };
-        }))
-    .StartWithHost();
+        }));
 ```
 
 For users using

src/OpenTelemetry.Exporter.Prometheus.AspNetCore/README.md

@@ -28,8 +28,7 @@ dotnet add package --prerelease OpenTelemetry.Exporter.Prometheus.AspNetCore
     ```csharp
     services.AddOpenTelemetry()
         .WithMetrics(builder => builder
-            .AddPrometheusExporter())
-        .StartWithHost();
+            .AddPrometheusExporter());
     ```
 
 * Or configure directly:

src/OpenTelemetry.Exporter.Zipkin/README.md

@@ -87,8 +87,7 @@ services.AddOpenTelemetry()
             HttpClient client = new HttpClient();
             client.DefaultRequestHeaders.Add("X-MyCustomHeader", "value");
             return client;
-        }))
-    .StartWithHost();
+        }));
 ```
 
 For users using

src/OpenTelemetry.Extensions.Hosting/.publicApi/netstandard2.0/PublicAPI.Shipped.txt

@@ -0,0 +1 @@
+#nullable enable

src/OpenTelemetry.Extensions.Hosting/.publicApi/netstandard2.0/PublicAPI.Unshipped.txt

@@ -1,13 +1,19 @@
 Microsoft.Extensions.DependencyInjection.OpenTelemetryServicesExtensions
 OpenTelemetry.Metrics.MeterProviderBuilderExtensions
-OpenTelemetry.OpenTelemetryBuilderHostingExtensions
+OpenTelemetry.OpenTelemetryBuilder
+OpenTelemetry.OpenTelemetryBuilder.ConfigureResource(System.Action<OpenTelemetry.Resources.ResourceBuilder!>! configure) -> OpenTelemetry.OpenTelemetryBuilder!
+OpenTelemetry.OpenTelemetryBuilder.Services.get -> Microsoft.Extensions.DependencyInjection.IServiceCollection!
+OpenTelemetry.OpenTelemetryBuilder.WithMetrics() -> OpenTelemetry.OpenTelemetryBuilder!
+OpenTelemetry.OpenTelemetryBuilder.WithMetrics(System.Action<OpenTelemetry.Metrics.MeterProviderBuilder!>! configure) -> OpenTelemetry.OpenTelemetryBuilder!
+OpenTelemetry.OpenTelemetryBuilder.WithTracing() -> OpenTelemetry.OpenTelemetryBuilder!
+OpenTelemetry.OpenTelemetryBuilder.WithTracing(System.Action<OpenTelemetry.Trace.TracerProviderBuilder!>! configure) -> OpenTelemetry.OpenTelemetryBuilder!
 OpenTelemetry.Trace.TracerProviderBuilderExtensions
-static Microsoft.Extensions.DependencyInjection.OpenTelemetryServicesExtensions.AddOpenTelemetryMetrics(this Microsoft.Extensions.DependencyInjection.IServiceCollection services) -> Microsoft.Extensions.DependencyInjection.IServiceCollection
-static Microsoft.Extensions.DependencyInjection.OpenTelemetryServicesExtensions.AddOpenTelemetryMetrics(this Microsoft.Extensions.DependencyInjection.IServiceCollection services, System.Action<OpenTelemetry.Metrics.MeterProviderBuilder> configure) -> Microsoft.Extensions.DependencyInjection.IServiceCollection
-static Microsoft.Extensions.DependencyInjection.OpenTelemetryServicesExtensions.AddOpenTelemetryTracing(this Microsoft.Extensions.DependencyInjection.IServiceCollection services) -> Microsoft.Extensions.DependencyInjection.IServiceCollection
-static Microsoft.Extensions.DependencyInjection.OpenTelemetryServicesExtensions.AddOpenTelemetryTracing(this Microsoft.Extensions.DependencyInjection.IServiceCollection services, System.Action<OpenTelemetry.Trace.TracerProviderBuilder> configure) -> Microsoft.Extensions.DependencyInjection.IServiceCollection
-static OpenTelemetry.Metrics.MeterProviderBuilderExtensions.Configure(this OpenTelemetry.Metrics.MeterProviderBuilder meterProviderBuilder, System.Action<System.IServiceProvider, OpenTelemetry.Metrics.MeterProviderBuilder> configure) -> OpenTelemetry.Metrics.MeterProviderBuilder
-static OpenTelemetry.Metrics.MeterProviderBuilderExtensions.GetServices(this OpenTelemetry.Metrics.MeterProviderBuilder meterProviderBuilder) -> Microsoft.Extensions.DependencyInjection.IServiceCollection
-static OpenTelemetry.OpenTelemetryBuilderHostingExtensions.StartWithHost(this OpenTelemetry.OpenTelemetryBuilder builder) -> OpenTelemetry.OpenTelemetryBuilder
-static OpenTelemetry.Trace.TracerProviderBuilderExtensions.Configure(this OpenTelemetry.Trace.TracerProviderBuilder tracerProviderBuilder, System.Action<System.IServiceProvider, OpenTelemetry.Trace.TracerProviderBuilder> configure) -> OpenTelemetry.Trace.TracerProviderBuilder
-static OpenTelemetry.Trace.TracerProviderBuilderExtensions.GetServices(this OpenTelemetry.Trace.TracerProviderBuilder tracerProviderBuilder) -> Microsoft.Extensions.DependencyInjection.IServiceCollection
+static Microsoft.Extensions.DependencyInjection.OpenTelemetryServicesExtensions.AddOpenTelemetry(this Microsoft.Extensions.DependencyInjection.IServiceCollection! services) -> OpenTelemetry.OpenTelemetryBuilder!
+static Microsoft.Extensions.DependencyInjection.OpenTelemetryServicesExtensions.AddOpenTelemetryMetrics(this Microsoft.Extensions.DependencyInjection.IServiceCollection! services) -> Microsoft.Extensions.DependencyInjection.IServiceCollection!
+static Microsoft.Extensions.DependencyInjection.OpenTelemetryServicesExtensions.AddOpenTelemetryMetrics(this Microsoft.Extensions.DependencyInjection.IServiceCollection! services, System.Action<OpenTelemetry.Metrics.MeterProviderBuilder!>! configure) -> Microsoft.Extensions.DependencyInjection.IServiceCollection!
+static Microsoft.Extensions.DependencyInjection.OpenTelemetryServicesExtensions.AddOpenTelemetryTracing(this Microsoft.Extensions.DependencyInjection.IServiceCollection! services) -> Microsoft.Extensions.DependencyInjection.IServiceCollection!
+static Microsoft.Extensions.DependencyInjection.OpenTelemetryServicesExtensions.AddOpenTelemetryTracing(this Microsoft.Extensions.DependencyInjection.IServiceCollection! services, System.Action<OpenTelemetry.Trace.TracerProviderBuilder!>! configure) -> Microsoft.Extensions.DependencyInjection.IServiceCollection!
+static OpenTelemetry.Metrics.MeterProviderBuilderExtensions.Configure(this OpenTelemetry.Metrics.MeterProviderBuilder! meterProviderBuilder, System.Action<System.IServiceProvider!, OpenTelemetry.Metrics.MeterProviderBuilder!>! configure) -> OpenTelemetry.Metrics.MeterProviderBuilder!
+static OpenTelemetry.Metrics.MeterProviderBuilderExtensions.GetServices(this OpenTelemetry.Metrics.MeterProviderBuilder! meterProviderBuilder) -> Microsoft.Extensions.DependencyInjection.IServiceCollection!
+static OpenTelemetry.Trace.TracerProviderBuilderExtensions.Configure(this OpenTelemetry.Trace.TracerProviderBuilder! tracerProviderBuilder, System.Action<System.IServiceProvider!, OpenTelemetry.Trace.TracerProviderBuilder!>! configure) -> OpenTelemetry.Trace.TracerProviderBuilder!
+static OpenTelemetry.Trace.TracerProviderBuilderExtensions.GetServices(this OpenTelemetry.Trace.TracerProviderBuilder! tracerProviderBuilder) -> Microsoft.Extensions.DependencyInjection.IServiceCollection!

src/OpenTelemetry.Extensions.Hosting/CHANGELOG.md

@@ -2,6 +2,11 @@
 
 ## Unreleased
 
+* Added `AddOpenTelemetry` extension from SDK and removed `StartWithHost`.
+  `AddOpenTelemetry` now registers the `IHostedService` used to start collecting
+  traces and/or metrics.
+  ([#4174](https://github.com/open-telemetry/opentelemetry-dotnet/pull/4174))
+
 ## 1.4.0-rc.3
 
 Released 2023-Feb-01

src/OpenTelemetry.Extensions.Hosting/Implementation/TelemetryHostedService.cs

@@ -20,6 +20,10 @@
 using OpenTelemetry.Metrics;
 using OpenTelemetry.Trace;
 
+// Warning: Do not change the namespace or class name in this file! Azure
+// Functions has taken a dependency on the specific details:
+// https://github.com/Azure/azure-functions-host/blob/d4655cc4fbb34fc14e6861731991118a9acd02ed/src/WebJobs.Script.WebHost/DependencyInjection/DependencyValidator/DependencyValidator.cs#L57
+
 namespace OpenTelemetry.Extensions.Hosting.Implementation;
 
 internal sealed class TelemetryHostedService : IHostedService

src/OpenTelemetry.Extensions.Hosting/Metrics/MeterProviderBuilderExtensions.cs

@@ -15,6 +15,7 @@
 // </copyright>
 
 using Microsoft.Extensions.DependencyInjection;
+using OpenTelemetry.Internal;
 
 namespace OpenTelemetry.Metrics
 {
@@ -34,7 +35,12 @@ public static class MeterProviderBuilderExtensions
         [Obsolete("Configure has been replaced by factory extensions. This method will be removed in a future version.")]
         public static MeterProviderBuilder Configure(this MeterProviderBuilder meterProviderBuilder, Action<IServiceProvider, MeterProviderBuilder> configure)
         {
-            return (meterProviderBuilder as IDeferredMeterProviderBuilder)?.Configure(configure);
+            if (meterProviderBuilder is IDeferredMeterProviderBuilder deferredMeterProviderBuilder)
+            {
+                deferredMeterProviderBuilder.Configure(configure);
+            }
+
+            return meterProviderBuilder;
         }
 
         /// <summary>
@@ -47,8 +53,17 @@ public static MeterProviderBuilder Configure(this MeterProviderBuilder meterProv
         [Obsolete("Call ConfigureServices instead this method will be removed in a future version.")]
         public static IServiceCollection GetServices(this MeterProviderBuilder meterProviderBuilder)
         {
-            IServiceCollection services = null;
+            Guard.ThrowIfNull(meterProviderBuilder);
+
+            IServiceCollection? services = null;
+
             meterProviderBuilder.ConfigureServices(s => services = s);
+
+            if (services == null)
+            {
+                throw new NotSupportedException($"GetServices is not supported on the '{meterProviderBuilder.GetType()}' builder type.");
+            }
+
             return services;
         }
     }

src/OpenTelemetry.Extensions.Hosting/OpenTelemetry.Extensions.Hosting.csproj

@@ -1,13 +1,11 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <!-- OmniSharp/VS Code requires TargetFrameworks to be in descending order for IntelliSense and analysis. -->
     <TargetFrameworks>netstandard2.0</TargetFrameworks>
     <Description>Contains extensions to start OpenTelemetry in applications using Microsoft.Extensions.Hosting</Description>
     <RootNamespace>OpenTelemetry</RootNamespace>
     <MinVerTagPrefix>core-</MinVerTagPrefix>
-
-    <!-- this is temporary. will remove in future PR. -->
-    <Nullable>disable</Nullable>
+    <Nullable>enable</Nullable>
   </PropertyGroup>
 
   <!--Do not run ApiCompat for netstandard2.0 as this is newly added. Remove this property once we have released a stable version.-->

src/OpenTelemetry/OpenTelemetryBuilder.cs → src/OpenTelemetry.Extensions.Hosting/OpenTelemetryBuilder.cs

@@ -14,8 +14,6 @@
 // limitations under the License.
 // </copyright>
 
-#nullable enable
-
 using Microsoft.Extensions.DependencyInjection;
 using OpenTelemetry.Internal;
 using OpenTelemetry.Metrics;
@@ -28,7 +26,7 @@ namespace OpenTelemetry;
 /// Contains methods for configuring the OpenTelemetry SDK inside an <see
 /// cref="IServiceCollection"/>.
 /// </summary>
-public class OpenTelemetryBuilder
+public sealed class OpenTelemetryBuilder
 {
     internal OpenTelemetryBuilder(IServiceCollection services)
     {
@@ -74,18 +72,9 @@ public OpenTelemetryBuilder ConfigureResource(
     /// Adds metric services into the builder.
     /// </summary>
     /// <remarks>
-    /// Notes:
-    /// <list type="bullet">
-    /// <item>A <see cref="MeterProvider"/> will not be created automatically
-    /// using this method. To begin collecting metrics either use the
-    /// <c>OpenTelemetryBuilder.StartWithHost</c> extension in the
-    /// <c>OpenTelemetry.Extensions.Hosting</c> package or access the <see
-    /// cref="MeterProvider"/> through the application <see
-    /// cref="IServiceProvider"/>.</item>
-    /// <item>This is safe to be called multiple times and by library authors.
+    /// Note: This is safe to be called multiple times and by library authors.
     /// Only a single <see cref="MeterProvider"/> will be created for a given
-    /// <see cref="IServiceCollection"/>.</item>
-    /// </list>
+    /// <see cref="IServiceCollection"/>.
     /// </remarks>
     /// <returns>The supplied <see cref="OpenTelemetryBuilder"/> for chaining
     /// calls.</returns>
@@ -115,18 +104,9 @@ public OpenTelemetryBuilder WithMetrics(Action<MeterProviderBuilder> configure)
     /// Adds tracing services into the builder.
     /// </summary>
     /// <remarks>
-    /// Notes:
-    /// <list type="bullet">
-    /// <item>A <see cref="TracerProvider"/> will not be created automatically
-    /// using this method. To begin collecting traces either use the
-    /// <c>OpenTelemetryBuilder.StartWithHost</c> extension in the
-    /// <c>OpenTelemetry.Extensions.Hosting</c> package or access the <see
-    /// cref="TracerProvider"/> through the application <see
-    /// cref="IServiceProvider"/>.</item>
-    /// <item>This is safe to be called multiple times and by library authors.
+    /// Note: This is safe to be called multiple times and by library authors.
     /// Only a single <see cref="TracerProvider"/> will be created for a given
-    /// <see cref="IServiceCollection"/>.</item>
-    /// </list>
+    /// <see cref="IServiceCollection"/>.
     /// </remarks>
     /// <returns>The supplied <see cref="OpenTelemetryBuilder"/> for chaining
     /// calls.</returns>