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title: 如何控制追踪数量？
weight: 40
Istio 通过 Envoy，目前支持基于百分比的采样策略来生成追踪信息。
有关如何设置此采样率的更多信息，请参阅[本节](/zh/docs/tasks/observability/distributed-tracing/overview/#trace-sampling)。