Addition of release notes

Signed-off-by: Harshit Gangal <[email protected]>

changelog/18.0/18.0.2/changelog.md

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+# Changelog of Vitess v18.0.2
+
+### Bug fixes 
+#### Cluster management
+ * [release-18.0] Fix Panic in PRS due to a missing nil check (#14656) [#14676](https://github.com/vitessio/vitess/pull/14676)
+ * Revert "[release-18.0] Replace use of `WAIT_UNTIL_SQL_THREAD_AFTER_GTIDS` with `WAIT_FOR_EXECUTED_GTID_SET` (#14612)" [#14742](https://github.com/vitessio/vitess/pull/14742) 
+#### Evalengine
+ * [release-18.0] evalengine: Fix the min / max calculation for decimals (#14614) [#14616](https://github.com/vitessio/vitess/pull/14616) 
+#### Query Serving
+ * [release-18.0] fix concurrency on stream execute engine primitives (#14586) [#14592](https://github.com/vitessio/vitess/pull/14592)
+ * [18.0] bug fix: stop all kinds of expressions from cnf-exploding [#14593](https://github.com/vitessio/vitess/pull/14593)
+ * [release-18.0] bugfix: do not rewrite an expression twice (#14641) [#14643](https://github.com/vitessio/vitess/pull/14643)
+ * [release-18.0] tabletserver: do not consolidate streams on primary tablet when consolidator mode is `notOnPrimary` (#14332) [#14679](https://github.com/vitessio/vitess/pull/14679)
+ * [release-18.0] TabletServer: Handle nil targets properly everywhere (#14734) [#14741](https://github.com/vitessio/vitess/pull/14741) 
+#### VReplication
+ * [release-18.0] VReplication TableStreamer: Only stream tables in tablestreamer (ignore views) (#14646) [#14649](https://github.com/vitessio/vitess/pull/14649)
+ * [release-18.0] VDiff: Fix vtctldclient limit bug (#14778) [#14780](https://github.com/vitessio/vitess/pull/14780)
+### CI/Build 
+#### Build/CI
+ * [release-18.0] Update MySQL apt package and GPG signature (#14785) [#14792](https://github.com/vitessio/vitess/pull/14792) 
+#### General
+ * [release-18.0] Upgrade the Golang version to `go1.21.5` [#14690](https://github.com/vitessio/vitess/pull/14690)
+### Dependabot 
+#### VTAdmin
+ * [release-18.0] Bump @adobe/css-tools from 4.3.1 to 4.3.2 in /web/vtadmin (#14654) [#14668](https://github.com/vitessio/vitess/pull/14668)
+### Enhancement 
+#### Backup and Restore
+ * [release-18.0] increase vtctlclient backupShard command success rate (#14604) [#14639](https://github.com/vitessio/vitess/pull/14639) 
+#### Build/CI
+ * [release-18.0] Add step to static check to ensure consistency of GHA workflows (#14724) [#14727](https://github.com/vitessio/vitess/pull/14727) 
+#### Query Serving
+ * [release-18.0] planbuilder: push down ordering through filter (#14583) [#14584](https://github.com/vitessio/vitess/pull/14584)
+### Internal Cleanup 
+#### TabletManager
+ * [release-18.0] Replace use of `WAIT_UNTIL_SQL_THREAD_AFTER_GTIDS` with `WAIT_FOR_EXECUTED_GTID_SET` (#14612) [#14617](https://github.com/vitessio/vitess/pull/14617) 
+#### vtctldclient
+ * [release-18.0] Fix typo for `--cells` flag help description in `ApplyRoutingRules` (#14721) [#14723](https://github.com/vitessio/vitess/pull/14723)
+### Performance 
+#### Query Serving
+ * vindexes: fix pooled collator buffer memory leak [#14621](https://github.com/vitessio/vitess/pull/14621)
+### Regression 
+#### Query Serving
+ * [release-18.0] plabuilder: use OR for not in comparisons (#14607) [#14615](https://github.com/vitessio/vitess/pull/14615)
+ * [release-18.0] fix: insert on duplicate key update missing BindVars (#14728) [#14755](https://github.com/vitessio/vitess/pull/14755)
+### Release 
+#### General
+ * Back to dev mode after v18.0.1 [#14580](https://github.com/vitessio/vitess/pull/14580)
+ * [release-18.0] Code Freeze for `v18.0.2` [#14804](https://github.com/vitessio/vitess/pull/14804)
+### Testing 
+#### Backup and Restore
+ * [release-18.0] Add a retry to remove the vttablet directory during upgrade/downgrade backup tests (#14753) [#14758](https://github.com/vitessio/vitess/pull/14758)
+

changelog/18.0/18.0.2/release_notes.md

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+# Release of Vitess v18.0.2
+The entire changelog for this release can be found [here](https://github.com/vitessio/vitess/blob/main/changelog/18.0/18.0.2/changelog.md).
+
+The release includes 24 merged Pull Requests.
+
+Thanks to all our contributors: @app/github-actions, @app/vitess-bot, @brendar, @deepthi, @harshit-gangal, @systay
+