Failed to connect to the database: SQLSTATE[HY000] [2002]

Hello, I have this mail and I don´t know what it is.
Cron <apache@semedic> /usr/bin/scl enable rh-php73 -- php -d memory_limit=512M -d apc.enable_cli=1 -f /usr/share/nextcloud/cron.php

Doctrine\DBAL\Exception: Failed to connect to the database: An exception occurred in the driver: SQLSTATE[HY000] [2002] No such file or directory in /usr/share/nextcloud/lib/private/DB/Connection.php:87
Stack trace:
#0 /usr/share/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1486): OC\DB\Connection->connect()
#1 /usr/share/nextcloud/3rdparty/doctrine/dbal/src/Connection.php(1118): Doctrine\DBAL\Connection->getWrappedConnection()
#2 /usr/share/nextcloud/lib/private/DB/Connection.php(262): Doctrine\DBAL\Connection->executeStatement('DELETE FROM `oc...', Array, Array)
#3 /usr/share/nextcloud/3rdparty/doctrine/dbal/src/Query/QueryBuilder.php(213): OC\DB\Connection->executeStatement('DELETE FROM `oc...', Array, Array)
#4 /usr/share/nextcloud/lib/private/DB/QueryBuilder/QueryBuilder.php(287): Doctrine\DBAL\Query\QueryBuilder->execute()
#5 /usr/share/nextcloud/lib/private/BackgroundJob/JobList.php(110): OC\DB\QueryBuilder\QueryBuilder->execute()
#6 /usr/share/nextcloud/apps/settings/lib/BackgroundJobs/VerifyUserData.php(99): OC\BackgroundJob\JobList->remove(Object(OCA\Settings\BackgroundJobs\VerifyUserData), '{"verificationC...')
#7 /usr/share/nextcloud/cron.php(127): OCA\Settings\BackgroundJobs\VerifyUserData->execute(Object(OC\BackgroundJob\JobList), Object(OC\Log))
#8 {main}

If nextcloud is working as expected but occasionally you get that message it coult be because of this: