Workers - Workers tracing now supports custom spans
From the publisher
You can now create custom trace spans in your Workers code using tracing.enterSpan(). Custom spans appear alongside the automatic platform instrumentation (fetch calls, KV reads, D1 queries, and other platform operations) in your traces and OpenTelemetry exports, with correct parent-child nesting. The API is available via import { tracing } from "cloudflare:workers" or through the handler context as ctx.tracing: import { tracing } from "cloudflare:workers"; export default { async fetch(request, env, ctx) { return tracing.enterSpan("handleRequest", async (span) => { span.setAttribute("url.path", new URL(request.url).pathname); const data = await env.MY_KV.get("key"); return new Response(data); }); }, }; Spans nest automatically based on the JavaScript async context, and are auto-ended when the callback returns or its returned promise settles.
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