---
description: Workers Observability now adds warning attributes to spans to help identify non-fatal telemetry issues.
title: Workers Observability now surfaces warning attributes on spans for non-fatal errors
image: https://developers.cloudflare.com/changelog/post/2026-07-07-warning-attributes/og.png?v=37ebc5566a9264cb
---

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July 7, 2026

## Workers Observability now surfaces warning attributes on spans for non-fatal errors

[Workers](https://developers.cloudflare.com/workers/)

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Workers Observability now attaches warning attributes to spans for non-fatal telemetry issues. These attributes help you identify instrumentation issues.

When a warning is present, both attributes are set together:

- `cloudflare.warning.type` — An identifier indicating the type of warning condition.
- `cloudflare.warning.message` — A free-form, human-readable explanation of the warning condition.

For example, recording an entire webhook payload as a span attribute can exceed the span data limit:

```js
export default {
	async fetch(request, env, ctx) {
		const payload = await request.text();

		return ctx.tracing.enterSpan("receive-webhook", (span) => {
			span.setAttribute("webhook.payload", payload);
			return new Response("Accepted", { status: 202 });
		});
	},
};
```

```ts
export default {
  async fetch(request: Request, env: Env, ctx: ExecutionContext) {
    const payload = await request.text();

    return ctx.tracing.enterSpan("receive-webhook", (span) => {
      span.setAttribute("webhook.payload", payload);
      return new Response("Accepted", { status: 202 });
    });
  },
};
```

The Worker still returns `202 Accepted`, but tracing drops the oversized attribute. The span includes `cloudflare.warning.type` set to `span_data_limit_exceeded` and a `cloudflare.warning.message` identifying the rejected attribute and its size.

For more information, refer to [Warning attributes](https://developers.cloudflare.com/workers/observability/traces/spans-and-attributes/#warning-attributes).

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```