CHANGELOG: update changes for issue 18089

[fuweid]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.84%. Comparing base (4dab785) to head (3f2d4dc).
Report is 2 commits behind head on main.

❗ Current head 3f2d4dc differs from pull request most recent head 8db31b6

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Additional details and impacted files

see 12 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18482      +/-   ##
==========================================
+ Coverage   68.81%   68.84%   +0.03%     
==========================================
  Files         420      420              
  Lines       35490    35490              
==========================================
+ Hits        24421    24432      +11     
+ Misses       9640     9635       -5     
+ Partials     1429     1423       -6     

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[jmhbnz]

Thanks @fuweid, etcd server entry lgtm. Question below on adding test changes, I defer to Marek & Benjamin on this.

[ahrtr]

Suggested change

	- [keep tombstone if revision == compactAtRev](https://github.com/etcd-io/etcd/pull/18475)
	- [Keep the tombstone during compaction if it happens to be the compaction revision](https://github.com/etcd-io/etcd/pull/18475).

[ahrtr]

ditto

[ahrtr]

Link to #18089

[jmhbnz]

LGTM

[ahrtr]

LGTM

Thank you!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, fuweid, jmhbnz

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