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sync-diff-inspector: clarify data type support and improve collation guidance

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### What is changed, added or deleted? (Required) This PR updates the sync-diff-inspector documentation to fix misleading language about data type support and add [empirically-validated](https://github.com/alastori/tidb-sandbox/blob/main/labs/sync-diff-inspector/lab-01-data-types-validation/lab-01-data-types-validation.md) guidance to prevent false-positive validation...

alastori

v8.5.5: Add unified.cpu-threshold config

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### First-time contributors' checklist - [x] I've signed the [**Contributor License Agreement**](https://cla.pingcap.net/pingcap/docs), which is required for the repository owners to accept my contribution. ### What is changed, added or deleted?...

v01dstar

add config for graceful shutdown

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### First-time contributors' checklist - [x] I've signed the [**Contributor License Agreement**](https://cla.pingcap.net/pingcap/docs), which is required for the repository owners to accept my contribution. ### What is changed, added or deleted?...

hujiatao0

best-practices: add a new guide on mastering partitioned tables

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- Query optimization with partition pruning - Performance comparison: Non-Partitioned vs Local Index vs Global Index - Data cleanup efficiency: TTL vs DROP PARTITION - Partition drop performance: Local Index...

shaoxiqian

*: add slow log control variables (tidb_slow_log_rules, tidb_slow_log_max_per_sec) and hint write_slow_log

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### What is changed, added or deleted? (Required) https://github.com/pingcap/tidb/issues/64010 Add slow log control variables (tidb_slow_log_rules, tidb_slow_log_max_per_sec) and hint write_slow_log ### Which TiDB version(s) do your changes apply to? (Required) **Tips...

lilin90

tiproxy: add note about reloading certificates once an hour (#22138)

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This is an automated cherry-pick of #22138 ### First-time contributors' checklist - [x] I've signed the [**Contributor License Agreement**](https://cla.pingcap.net/pingcap/docs), which is required for the repository owners to accept my contribution....

ti-chi-bot

ticdc: update doc

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### First-time contributors' checklist - [x] I've signed the [**Contributor License Agreement**](https://cla.pingcap.net/pingcap/docs), which is required for the repository owners to accept my contribution. ### What is changed, added or deleted?...

qiancai

v8.5.5: add config for graceful shutdown

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### First-time contributors' checklist - [x] I've signed the [**Contributor License Agreement**](https://cla.pingcap.net/pingcap/docs), which is required for the repository owners to accept my contribution. ### What is changed, added or deleted?...

hujiatao0

Update migrate-prometheus-metrics-integrations.md

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### First-time contributors' checklist - [ ] I've signed the [**Contributor License Agreement**](https://cla.pingcap.net/pingcap/docs), which is required for the repository owners to accept my contribution. ### What is changed, added or...

huoyao1125

Update keywords and add check workflow

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### First-time contributors' checklist - [x] I've signed the [**Contributor License Agreement**](https://cla.pingcap.net/pingcap/docs), which is required for the repository owners to accept my contribution. ### What is changed, added or deleted?...

dveeden