MariaDB backups on buse, ecours and puppet-git.lizard trigger useless/noisy email notifications since the upgrade to Stretch

== warnings from /etc/backup.d/10.mysql ==

Info: Initializing SQL dump method
Info: Successfully finished dump of mysql database icinga2
Info: Successfully finished dump of mysql database icingaweb2
Warning: mysqldump: Couldn't execute 'SELECT /*!40001 SQL_NO_CACHE icinga2/ Lizard/
Tails/ zones.d/ icinga2 Lizard README Tails zones.d FROM `EVENTS`': Cannot proceed
because system tables used by Event Scheduler were found damaged at server start
(1577)
Warning: Failed to dump mysql databases information_schema
Info: Successfully finished dump of mysql database mysql
Info: Successfully finished dump of mysql database performance_schema

Parent Task: #12160 (closed)

Related issues

• Blocks #13284

Original created by @intrigeri on 12463 (Redmine)