meStamp</a></code></td><td><p>The end time of the span.</p><p>Required.</p></td><td>No</td></tr><tr id=Template-span_tags><td><code>spanTags</code></td><td><code>map&lt;string,&nbsp;<a href=/v1.6/zh/docs/reference/config/policy-and-telemetry/istio.policy.v1beta1.html#Value>Value</a>></code></td><td><p>Span tags are a set of &lt; key, value > pairs that provide metadata for the
entire span. The values can be specified in the form of expressions.</p><p>Optional.</p></td><td>No</td></tr><tr id=Template-httpSta