me: mesh-default
  namespace: istio-system
spec:
  tracing:
    - providers:
        - name: &#34;zipkin&#34;
      randomSamplingPercentage: 100.00
      custom_tags:
        my_tag_header:
          header:
            name: &lt;CLIENT-HEADER&gt;
            defaultValue: &lt;VALUE&gt;      # optional
</code></pre></li></ol><h2 id=customizing-tracing-tag-length>自定义链路追踪标签长度</h2><p>默认情况下，<code>HttpUrl</code> 的 span 标签的请求最大长度为256。要修改此最大长