Check if Icinga2 perfdata are garbage collected

Originally created by @intrigeri on #11368 (Redmine)

https://icingaweb2.tails.boum.org/monitoring/service/show?host=ecours.tails.boum.org&service=system_disks shows that 80% of inodes are used on ecours’ system partition. That’s because of /var/spool/icinga2/perfdata, that uses no less than 174K inodes today. Are those very many files cleaned up at some point?

Edited May 15, 2020 by intrigeri

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