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为 PD 监控说明添加针对不同调度器事件的介绍 #17786

@JmPotato

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@JmPotato

Change Request

This repository is ONLY used to solve problems related to DOCS-CN.
For other issues (TiDB, TiKV, etc), please move to other repositories.

Please answer the following questions before submitting your issue. Thanks!

  1. Describe what you find is inappropriate or missing in the existing docs.

PD 重要监控指标详解 - Scheduler 中只介绍了各个面板的基本功能,但实际上针对每个监控项内部的事件也可以出具具体的说明,以便读者进一步理解监控的实际作用。

  1. Describe your suggestion or addition.

例如,我们可以为 Region Merge Checker 添加内部事件的说明:

img_v3_02c6_0fa27a80-19bb-4026-b03c-51d45c47f9fg

图中的 recently-start 意味着当前的 merge 调度由于 PD 刚刚启动的原因,需要至少等待一个 schedule.split-merge-interval 周期才会开始触发 merge 调度。如果想要加速,可以通过调整该配置参数的值来做到提前触发。

  1. Provide some reference materials (documents, websites, etc) if you could.

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