*: add slow log control variables (`tidb_slow_log_rules`, `tidb_slow_log_max_per_sec`) and hint `WRITE_SLOW_LOG` (#21009)#21406

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Commits on Mar 2, 2026

*: add two variables tidb_slow_log_rules and tidb_slow_log_max_per_sec

zimulala
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*: add WRITE_SLOW_LOG hint

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*: add test info and tiny update

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*: address a comment

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*: add version

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Update format

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Refine wording and format

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*: address comments

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*: tiny update

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Update identify-slow-queries.md

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Update system-variables.md

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Update wording for consistency

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Put two system variables in alphabetical order

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Update wording for consistency and clarity

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Use a tip

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Update identify-slow-queries.md

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Update system-variables.md

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Update system-variables.md

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Update system-variables.md

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Update identify-slow-queries.md

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Update system-variables.md

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Update identify-slow-queries.md

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*: add rule items

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Update identify-slow-queries.md

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Update identify-slow-queries.md

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Update identify-slow-queries.md

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Update Tip format

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