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.NET

Send traces from a .NET service to Watchtower over OTLP/HTTP with the standard OpenTelemetry SDK. Nothing Watchtower-specific is installed: the SDK reads the standard OTEL_* variables.

  1. Create a project, then an ingestion key (wti_...) with the ingest:traces scope. The key is shown once.

  2. Point the SDK at the gateway and pass the key in the x-watchtower-key header (Authorization: Bearer wti_... works too):

export OTEL_EXPORTER_OTLP_ENDPOINT=https://ingest.example.com
export OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
export OTEL_EXPORTER_OTLP_HEADERS=x-watchtower-key=wti_YOUR_KEY
export OTEL_SERVICE_NAME=my-service

  1. Add the SDK and run this once. The endpoint above is the gateway's base URL; the SDK appends /v1/traces.

dotnet add package OpenTelemetry
dotnet add package OpenTelemetry.Exporter.OpenTelemetryProtocol
using System.Diagnostics;
using OpenTelemetry;
using OpenTelemetry.Trace;

// AddOtlpExporter reads OTEL_EXPORTER_OTLP_*
using var provider = Sdk.CreateTracerProviderBuilder()
    .AddSource("onboarding")
    .AddOtlpExporter()
    .Build();

using var source = new ActivitySource("onboarding");
using (source.StartActivity("hello-watchtower")) { }

  1. Open the project's onboarding screen. It polls GET /v1/projects/{prj}/onboarding/first-event and turns green when the first span arrives. Then open the trace in the trace explorer.

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