juniortads / opentelemetry-dotnet-sample

ASP.NET Core Instrumentation for OpenTelemetry .NET

It is a simple project created with ASP.NET Core that uses OpenTelemetry for instrumentation and telemetry collection on incoming web requests.

Getting started

Run Jaeger

docker-compose up -d

Start the service

dotnet run

Advanced configuration

This instrumentation can be configured to change the default behavior

Enrich

For this sample we can enrich with tags some very important Headers["X-TENANT-ID"]

services.AddOpenTelemetryTracing((builder) => builder
                   .SetResourceBuilder(ResourceBuilder.CreateDefault().AddService(Configuration.GetValue<string>("Jaeger:ServiceName")))
                    .AddAspNetCoreInstrumentation((options) => options.Enrich = (activity, eventName, rawObject) =>
                    {
                        if (eventName.Equals("OnStartActivity"))
                        {
                            if (rawObject is HttpRequest httpRequest)
                            {
                                activity.SetTag("X-TENANT-ID", httpRequest.Headers["X-TENANT-ID"]);
                            }
                        }
                    })
                    .AddJaegerExporter(jaegerOptions =>
                    {
                        jaegerOptions.AgentHost = Configuration.GetValue<string>("Jaeger:Host");
                        jaegerOptions.AgentPort = Configuration.GetValue<int>("Jaeger:Port");
                    }));

Exporter libraries

I used Jaeger, but there are many others, see the OpenTelemetry registry for more exporters.