feat: add OpenTelemetry instrumentation (tracing + metrics + logging)

- OTLP gRPC exporter to 192.168.1.154:4316
- ASP.NET Core, HttpClient, EF Core, Runtime instrumentation
- Log export via AddOpenTelemetry logging

src/RAG.Api/Program.cs

@@ -1,10 +1,20 @@
 using Microsoft.EntityFrameworkCore;
+using OpenTelemetry.Logs;
 using RAG.Api;
 using RAG.Infrastructure.Persistence;
 using Volo.Abp.DependencyInjection;
 
 var builder = WebApplication.CreateBuilder(args);
 
+// OTel 日志导出
+builder.Logging.AddOpenTelemetry(logging =>
+{
+    logging.AddOtlpExporter(options =>
+    {
+        options.Endpoint = new Uri("http://192.168.1.154:4316");
+    });
+});
+
 // ABP 需要同时注册 ObjectAccessor 的具体类型和接口类型
 var appBuilderAccessor = new ObjectAccessor<Microsoft.AspNetCore.Builder.IApplicationBuilder>();
 var webAppAccessor = new ObjectAccessor<Microsoft.AspNetCore.Builder.WebApplication>();

src/RAG.Api/RAG.Api.csproj

@@ -4,6 +4,7 @@
     <TargetFramework>net10.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
+    <NoWarn>$(NoWarn);NU1902</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>
@@ -18,6 +19,14 @@
     </PackageReference>
     <PackageReference Include="Volo.Abp.AspNetCore" Version="10.3.0" />
     <PackageReference Include="Volo.Abp.Core" Version="10.3.0" />
+    <PackageReference Include="OpenTelemetry" Version="1.11.2" />
+    <PackageReference Include="OpenTelemetry.Exporter.Console" Version="1.11.2" />
+    <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.11.2" />
+    <PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.11.2" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.11.1" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.11.1" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.EntityFrameworkCore" Version="1.11.0-beta.2" />
+    <PackageReference Include="OpenTelemetry.Instrumentation.Runtime" Version="1.11.1" />
   </ItemGroup>
 
   <ItemGroup>

src/RAG.Api/RAGApiModule.cs

@@ -1,6 +1,9 @@
 using FastEndpoints;
 using FastEndpoints.Security;
 using FastEndpoints.Swagger;
+using OpenTelemetry.Metrics;
+using OpenTelemetry.Resources;
+using OpenTelemetry.Trace;
 using RAG.Api.Grpc;
 using RAG.Api.Middleware;
 using RAG.Api.Services;
@@ -23,6 +26,27 @@ public class RAGApiModule : AbpModule
         var services = context.Services;
         var config = services.GetConfiguration();
 
+        // OpenTelemetry
+        services.AddOpenTelemetry()
+            .ConfigureResource(r => r
+                .AddService(serviceName: "rag-backend", serviceVersion: "1.0.0"))
+            .WithTracing(tracing => tracing
+                .AddAspNetCoreInstrumentation()
+                .AddHttpClientInstrumentation()
+                .AddEntityFrameworkCoreInstrumentation()
+                .AddOtlpExporter(options =>
+                {
+                    options.Endpoint = new Uri("http://192.168.1.154:4316");
+                }))
+            .WithMetrics(metrics => metrics
+                .AddAspNetCoreInstrumentation()
+                .AddHttpClientInstrumentation()
+                .AddRuntimeInstrumentation()
+                .AddOtlpExporter((exporterOptions, readerOptions) =>
+                {
+                    exporterOptions.Endpoint = new Uri("http://192.168.1.154:4316");
+                }));
+
         // FastEndpoints + Swagger
         services.AddFastEndpoints();
         services.SwaggerDocument();