Hey Workers Developers,

I’m a product manager on the Workers Observability team. We're excited to announce the Open Beta for Automatic Tracing on Cloudflare Workers!

• Read the blog: https://blog.cloudflare.com/workers-tracing-now-in-open-beta/
• Check out our documentation: https://developers.cloudflare.com/workers/observability/traces/

What is Automatic Tracing?

Tracing provides clear visualization of your application's request flow, helping you quickly pinpoint performance bottlenecks. You now get:

• Zero-config instrumentation: Tracing is automatically integrated into the workerd runtime to instrument every I/O operation. There are no manual SDK integrations or code changes required to get started.
• Binding, fetch and handler spans: Automatically traces interactions with most bindings like KV, R2, and Durable Objects, fetch and handler calls. Each operation is captured as a span and contains contextual metadata needed for debugging – out of the box!
• OpenTelemetry (OTLP) Export: Export your traces and logs directly to any OpenTelemetry-compatible platform (e.g. Grafana, Sentry, Honeycomb, Axiom)

We Need Your Feedback!

We are actively seeking input on:

• Instrumentation coverage: Are there any bindings or operations you wish were automatically traced but aren't yet?
• Span attributes: What additional metadata/attributes would provide the most value for debugging your specific workloads?
• Overall experience: Any issues, bugs, or confusion when enabling tracing or viewing data in the dashboard.
• Exporting OTEL: Any issues exporting your tracing and log data to your observability provider.

How to Get Started

To start viewing traces in the Cloudflare dashboard:

Add the following to your wrangler.jsonc:

"observability": {
  "traces": {
    "enabled": true
  }
}

Or if you already have the following configuration, you will automatically start emitting traces:

"observability": {
  "enabled": true
}

To start sending traces to your OTEL provider, follow the documentation [here](http://developers.cloudflare.com/workers/observability/exporting-opentelemetry-data/).

Pricing

Viewing and exporting traces is free throughout the beta, with pricing starting January 15, 2025. Read more about inclusions of the beta by referring to our documentation.

Coming soon:

• Full span and attribute instrumentation
• Trace context propagation
• Support for custom spans and attributes
• OTEL Metrics exports