sion: source.labels[&quot;version&quot;] | &quot;&quot;
</code></pre><p>See also: <a href=/v1.6/zh/docs/tasks/observability/distributed-tracing/>Distributed Tracing</a>
for information on tracing within Istio.</p><h2 id=Template>Template</h2><section><p>TraceSpan represents an individual span within a distributed trace.</p><p>When writing the configuration, the value for the fields associated with this template can either be a
literal or an <a href=/v1.6/zh/docs/reference//config/policy-and-telemetry/expres