Upcoming breaking changes (#7164)

* Update mattermost-changelog.md

* Update important-upgrade-notes.rst

* Update source/deploy/mattermost-changelog.md

Co-authored-by: Katie Wiersgalla <[email protected]>

* Update mattermost-changelog.md

---------

Co-authored-by: Katie Wiersgalla <[email protected]>
Co-authored-by: Carrie Warner (Mattermost) <[email protected]>

source/deploy/mattermost-changelog.md

@@ -115,6 +115,14 @@ New setting options were added to ``config.json``. Below is a list of the additi
 ### Contributors
  - [agarciamontoro](https://github.com/agarciamontoro), [agnivade](https://github.com/agnivade), [amyblais](https://github.com/amyblais), [andrleite](https://github.com/andrleite), [arush-vashishtha](https://github.com/arush-vashishtha), [asaadmahmood](https://github.com/asaadmahmood), [ayusht2810](https://github.com/ayusht2810), [azigler](https://github.com/azigler), [BenCookie95](https://github.com/BenCookie95), [bndn](https://translate.mattermost.com/user/bndn), [calebroseland](https://github.com/calebroseland), [coltoneshaw](https://github.com/coltoneshaw), [cpoile](https://github.com/cpoile), [crspeller](https://github.com/crspeller), [ctlaltdieliet](https://translate.mattermost.com/user/ctlaltdieliet), [cwarnermm](https://github.com/cwarnermm), [devinbinnie](https://github.com/devinbinnie), [DHaussermann](https://github.com/DHaussermann), [Eleferen](https://translate.mattermost.com/user/Eleferen), [emdecr](https://github.com/emdecr), [enahum](https://github.com/enahum), [enzowritescode](https://github.com/enzowritescode), [fasal26](https://github.com/fasal26), [fmartingr](https://github.com/fmartingr), [gabrieljackson](https://github.com/gabrieljackson), [grundleborg](https://github.com/grundleborg), [hanzei](https://github.com/hanzei), [harshilsharma63](https://github.com/harshilsharma63), [hmhealey](https://github.com/hmhealey), [ifoukarakis](https://github.com/ifoukarakis), [isacikgoz](https://github.com/isacikgoz), [jespino](https://github.com/jespino), [joakim.rivera](https://translate.mattermost.com/user/joakim.rivera), [johnsonbrothers](https://github.com/johnsonbrothers), [jprusch](https://github.com/jprusch), [JulienTant](https://github.com/JulienTant), [kaakaa](https://github.com/kaakaa), [Kshitij-Katiyar](https://github.com/Kshitij-Katiyar), [larkox](https://github.com/larkox), [lieut-data](https://github.com/lieut-data), [M-ZubairAhmed](https://github.com/M-ZubairAhmed), [majo](https://translate.mattermost.com/user/majo), [marianunez](https://github.com/marianunez), [marlenekoh](https://github.com/marlenekoh), [master7](https://translate.mattermost.com/user/master7), [matt-w99](https://github.com/matt-w99), [matthew-w](https://translate.mattermost.com/user/matthew-w), [matthewbirtch](https://github.com/matthewbirtch), [MeHow25](https://github.com/MeHow25), [mgdelacroix](https://github.com/mgdelacroix), [mickmister](https://github.com/mickmister), [mojahani](https://translate.mattermost.com/user/mojahani), [morgancz](https://github.com/morgancz), [mvitale1989](https://github.com/mvitale1989), [nickmisasi](https://github.com/nickmisasi), [nixusUM](https://github.com/nixusUM), [orimaimon](https://github.com/orimaimon), [phoinixgrr](https://github.com/phoinixgrr), [piotr-lasota](https://github.com/piotr-lasota), [pjenicot](https://translate.mattermost.com/user/pjenicot), [pmokeev](https://github.com/pmokeev), [rOt779kVceSgL](https://translate.mattermost.com/user/rOt779kVceSgL), [saturninoabril](https://github.com/saturninoabril), [sbishel](https://github.com/sbishel), [spirosoik](https://github.com/spirosoik), [sri-byte](https://github.com/sri-byte), [stafot](https://github.com/stafot), [streamer45](https://github.com/streamer45), [stylianosrigas](https://github.com/stylianosrigas), [svelle](https://github.com/svelle), [tarrow](https://github.com/tarrow), [ThrRip](https://github.com/ThrRip), [tnir](https://github.com/tnir), [toninis](https://github.com/toninis), [umrkhn](https://github.com/umrkhn), [varghesejose2020](https://github.com/varghesejose2020), [vish9812](https://github.com/vish9812), [wiggin77](https://github.com/wiggin77), [yasserfaraazkhan](https://github.com/yasserfaraazkhan), [yomiadetutu1](https://github.com/yomiadetutu1), [zsrv](https://github.com/zsrv)
 
+### Upcoming Breaking Changes in Mattermost v10.0 Release
+
+Mattermost v10.0 is planned for September, 2024. Below is a list of planned breaking changes for this release:
+
+1. MySQL - We will no longer support new installations using MySQL starting in v10. All new customers and/or deployments will only be supported with the minimum supported version of the PostgreSQL database. End of support for MySQL is targeted for Mattermost v11.
+2. Apps Framework - Apps framework will be deprecated in a future upcoming release. Please utilize the plugin framework for developing integrations with the core Mattermost platform.
+3. Playbooks for Enterprise - An Enterprise license will be required to use v2.0+ Playbooks functionality starting in v10. Team Edition and Professional deployments can continue to use Playbooks v1.x. Security and feature updates will only be added to Playbooks v2.0+.
+
 ## Release v9.8 - [Feature Release](https://docs.mattermost.com/upgrade/release-definitions.html#feature-release)
 
 - **9.8.1, released 2024-06-03**

source/upgrade/important-upgrade-notes.rst

@@ -12,6 +12,7 @@ Important Upgrade Notes
    - Disable global drafts. Admins can set the feature flag ``MM_FEATUREFLAGS_GLOBALDRAFTS`` to ``false`` to disable server-wide. It can't be disabled on a per-user basis. The code is located `here <https://github.com/mattermost/mattermost-server/blob/master/server/public/model/feature_flags.go#L74>`__.
    - Mattermost plugins built with Go versions 1.22.0 and 1.22.1 do not work. Plugin developers should use go 1.22.2 or newer instead.
    - Keybase has stopped serving our Ubuntu repository signing key. If you were using it, update your installation scripts to retrieve the key as mentioned in our docs: https://docs.mattermost.com/install/install-ubuntu.html.
+   - Mattermost v10.0 is planned for September, 2024. See a list of planned breaking changes for this release `in the changelog <https://docs.mattermost.com/deploy/mattermost-changelog.html#upcoming-breaking-changes-in-mattermost-v10.0-release>`__.
 
 +----------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+
 | If you’re upgrading from a version earlier than... | Then...                                                                                                                                                          |