Hello,

I will be *upgrading Gerrit* from the 3.8 series to the 3.9 series. I have scheduled the upgrade for *Monday June 3rd at 8am UTC*. It is immediately after the UTC morning backport & config window.

The upgrade requires the Gerrit service to be stopped for the duration of the upgrade. Given we do not need to reindex all the changes, the downtime should be just a few minutes.

Gerrit 3.9 brings:

 * Support for diff3 rendering for changes having conflict markers
   (T359821 <https://phabricator.wikimedia.org/T359821>) which
   corresponds to cgit merge.conflictStyle=diff3.
 * User Suggested Edits
   
<http://gerrit-documentation.storage.googleapis.com/Documentation/3.9.5/user-suggest-edits.html>,
   an easy way for reviewers to suggest code changes which can be
   easily applied by the change owner. One can imagine CI would be able
   to offers suggestions as well (such as phpcb from PHP CodeSniffer or
   eslint?).
 * Gerrit would now use "Revert^2" syntax when crafting a revert
   instead of chaining them as "Revert "Revert "Revert...".
 * And more UI changes
   <https://www.gerritcodereview.com/3.9.html#gerrit-ui-changes>

The release notes: https://www.gerritcodereview.com/3.9.html
<https://www.gerritcodereview.com/3.9.html>The upgrade task: https://phabricator.wikimedia.org/T354887 Deployment calendar entry <https://wikitech.wikimedia.org/wiki/Deployments#deploycal-item-20240603T0800>

Antoine "hashar" Musso
Wikimedia Release Engineering
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