add v8.5.5 release notes (#21195)#21281

Merged

qiancai merged 83 commits intopingcap:release-8.5from

ti-chi-bot:cherry-pick-21195-to-release-8.5

Jan 15, 2026

Commits on Jan 15, 2026

Add temp.md

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Delete temp.md

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Create release-8.5.5.md

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add feature description for #56522 and #58685

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add #17221

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Add three features

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add more features according to English PR

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add improvements and bug fixes

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add two new features

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adjust the feature order and add two features

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add the issue information for a feature

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Update releases/release-8.5.5.md

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Apply suggestions from code review

Oreoxmt
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Add br config "--checkpoint-storage"

lilin90
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update optimizer hint NO_INDEX_LOOKUP_PUSHDOWN

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Update releases/release-8.5.5.md

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remove duplicate blank lines

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Apply suggestions from code review

hfxsd
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Apply suggestions from code review

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add the feature description for storage engine identifiers

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Update releases/release-8.5.5.md

hfxsd
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Update releases/release-8.5.5.md

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move ticdc #12253 from bug fixes to improvements

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add PD improvements and bug fixes

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Compatibility changes: add tidb_index_lookup_pushdown_policy

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add execution improvements and bug fixes

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revise #63366 and #62120 descriptions

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update planner release note

hawkingrei
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remove useless file

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add the Chinese version for #9359 and #19006

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Refine wording and update links

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minor wording updates

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Update releases/release-8.5.5.md

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copy release note for some modules from the English PR

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add the tw tag for improvements and bug fixes

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add a bug fix for TiDB

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Add three BR config items and two behavior changes

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add compatibility changes for 5 parameters

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Apply suggestions from code review

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add links to system variables

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remove unnecessary spaces

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update PD, TiKV, BR

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Update releases/release-8.5.5.md

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Apply suggestions from code review

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Apply suggestions from code review

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Update releases/release-8.5.5.md

hfxsd
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Apply suggestions from code review

hfxsd
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refine TiDB improvements and PD bug fixes

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Apply suggestions from code review

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Apply suggestions from code review

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Apply suggestions from code review

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add store limit docs

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Apply suggestions from code review

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Discard changes to pd-control.md

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add readpool.cpu-threshold

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Update wording

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Apply suggestions from code review

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Update releases/release-8.5.5.md

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Apply suggestions from code review

lilin90
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Apply suggestions from code review

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add more compatibility changes

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Refine wording and format

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Apply suggestions from Frank945946

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add tidb_analyze_column_options

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Apply suggestions from code review

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Apply suggestions from code review

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change the default value to false for 8.5.5

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Apply suggestions from code review

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Update releases/release-8.5.5.md

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Update releases/release-8.5.5.md

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remove inline tag comments

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add TOC related changes and remove the link for downloading v8.5.4 offline package

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fix build errors

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Update releases/release-8.5.5.md

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remove a duplicated #58985 for the same issue

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fix a format issue

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Update releases/release-8.5.5.md

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fix format issues

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fix format issues

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Update releases/release-8.5.5.md

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update the release date

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Update releases/release-8.5.5.md
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Merge branch 'release-8.5' into pr/21281
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