namespace OpenTelemetry.Trace { public abstract class TracerProviderBuilder { protected TracerProviderBuilder(); public abstract TracerProviderBuilder AddInstrumentation<[Nullable(2)] TInstrumentation>(Func<TInstrumentation> instrumentationFactory) where TInstrumentation : class; public abstract TracerProviderBuilder AddSource(params string[] names); public abstract TracerProviderBuilder AddLegacySource(string operationName); } }