trace spans to them automatically.
See <a href=../zipkin/>Zipkin</a>, <a href=../jaeger/>Jaeger</a> and <a href=/v1.9/docs/tasks/observability/distributed-tracing/lightstep/>Lightstep</a> task docs about how Istio works with those tracing systems.</p><h2 id=trace-context-propagation>Trace context propagation</h2><p>Although Istio proxies are able to automatically send spans, they need some hints to tie together the entire trace.
Applications need to propagate the appropriate HTTP headers so that when the pr