Workers - Workers tracing — write custom spans with new startActiveSpan() and span.end() runtime APIs

The Workers runtime now provides built-in tracing.startActiveSpan() and span.end() APIs, allowing you to write custom spans for operations that last beyond a single callback — for example, instrumenting a stream pipeline where the span should stay open until the stream is fully consumed. This augments the existing API for writing custom spans , tracing.enterSpan() , which automatically ends a span when its callback is returned. With startActiveSpan() , the span remains open after the callback returns, and you call span.end() when the work is complete: src/index.js js import { tracing } from “c