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update MD by dispatch event pingcap/docs-cn release-8.5
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markdown-pages/zh/tidb/release-8.5/releases/release-8.5.5.md

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@@ -89,7 +89,7 @@ TiDB 版本:8.5.5
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为了防止 PD Leader 因重试风暴或类似的反馈循环而过载,TiDB 引入了熔断模式。当错误率达到预设阈值时,该模式会限制进入的流量,从而使系统能够恢复稳定。你可以通过系统变量 `tidb_cb_pd_metadata_error_rate_threshold_ratio` 来控制熔断器的触发。
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更多信息,请参考[用户文档](https://docs.pingcap.com/zh/tidb/v8.5/system-variables#tidb_cb_pd_metadata_error_rate_threshold_ratio-new-in-v855)
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更多信息,请参考[用户文档](https://docs.pingcap.com/zh/tidb/v8.5/system-variables#tidb_cb_pd_metadata_error_rate_threshold_ratio-从-v855-版本开始引入)
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### SQL 功能
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