code>x-b3-traceid</code></li><li><code>x-b3-spanid</code></li><li><code>x-b3-parentspanid</code></li><li><code>x-b3-sampled</code></li><li><code>x-b3-flags</code></li></ul><p>For commercial observability tools, refer to their documentation.</p><p>If you look at the <a href=https://github.com/istio/istio/blob/release-1.24/samples/bookinfo/src/productpage/productpage.py#L125>sample Python <code>productpage</code> service</a>, for example, you see that the application extracts the required headers for all trac