Monitor /tmp directories and / filesystems on all machines #29
Description
When the /tmp directory fills up, things stop working. We need to monitor the size of the filesystem that contains the /tmp directory and alert if it gets too full (90% is a good start).
This caused a stoppage of test report processing on cpantesters4.dh.bytemark.co.uk: The CPAN Testers API Mojolicious app used 800+ GB of temporary files in /tmp. We need to prevent this from happening again.