Hey,
my system gave me the following message:
Code
Resource limit matched Service fs_media_f90c135b-1b99-4dbc-9260-28a13561d27c
Date: Fri, 13 Jan 2017 20:35:27
Action: alert
Host: omv-fsc.fritz.box
Description: space usage 99.9% matches resource limit [space usage>80.0%]
Your faithful employee,
Monit
I modifying my omv-mkconf while I added the line
OMV_MONIT_SERVICE_FILESYSTEM_SPACEUSAGE="95"
or
OMV_MONIT_SERVICE_FILESYSTEM_SPACEUSAGE=95
and it was not successful.
My system answered with the following message:
Code
root@omv-fsc:~# omv-mkconf monit
/usr/sbin/omv-mkconf: 53: /etc/default/openmediavault: OMV_MONIT_SERVICE_FILESYSTEM_SPACEUSAGE=95: not found
root@omv-fsc:~#
What must I do to resolve this monit message? 
Thank you very much.
make some space free