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Add perl dependency requirement for tikv heap profiling (#16221)
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dashboard/dashboard-profiling.md

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@@ -26,6 +26,8 @@ aliases: ['/docs-cn/dev/dashboard/dashboard-profiling/']
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- Heap:TiDB、PD、TiKV 实例上各个内部函数的内存占用开销情况
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> 从 v7.5 版本开始,支持获取 TiKV Heap Profile,并且需要 TiDB Dashboad 的运行环境中有 Perl 依赖,否则会报错。
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- Mutex:TiDB、PD 实例上各个处于等待状态的 Mutex 情况
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- Goroutine:TiDB、PD 实例上各个 Goroutine 的运行状态及调用栈情况

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