==== Error ====
* mwversion: 1.42.0-wmf.22
* reqId: 1e0f1214-e0bf-4718-9a6c-5178590f35b8
* [[ https://logstash.wikimedia.org/app/dashboards#/view/AXFV7JE83bOlOASGccsT?_g=(time:(from:'2024-03-19T18:41:24.879Z',to:'2024-03-20T18:42:00.878Z'))&_a=(query:(query_string:(query:'reqId:%221e0f1214-e0bf-4718-9a6c-5178590f35b8%22'))) | Find reqId in Logstash ]]
```name=normalized_message,lines=10
[{reqId}] {exception_url} MediaWiki\Linter\MissingCategoryException: Cannot find id for 'night-mode-unaware-background-color'
```
```name=exception.trace,lines=10
from /srv/mediawiki/php-1.42.0-wmf.22/extensions/Linter/includes/CategoryManager.php(223)
#0 /srv/mediawiki/php-1.42.0-wmf.22/extensions/Linter/includes/Database.php(182): MediaWiki\Linter\CategoryManager->getCategoryId(string, NULL)
#1 [internal function]: MediaWiki\Linter\Database->buildErrorRow(MediaWiki\Linter\LintError)
#2 /srv/mediawiki/php-1.42.0-wmf.22/extensions/Linter/includes/Database.php(289): array_map(array, array)
#3 /srv/mediawiki/php-1.42.0-wmf.22/extensions/Linter/includes/RecordLintJob.php(60): MediaWiki\Linter\Database->setForPage(array)
#4 /srv/mediawiki/php-1.42.0-wmf.22/extensions/EventBus/includes/JobExecutor.php(80): MediaWiki\Linter\RecordLintJob->run()
#5 /srv/mediawiki/rpc/RunSingleJob.php(60): MediaWiki\Extension\EventBus\JobExecutor->execute(array)
#6 {main}
```
==== Impact ====
Thousands of hits for this error when promoting the xxx train to group1 today.
I'm rolling back the train.