net-mgmt/netdata: apps.plugin process grouping

I'd like to monitor the number of open files, in connection with 
<https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273669>.

I can't see what's pictured at 
<https://github.com/netdata/netdata/issues/1272#issuecomment-261995709>.

Am I missing something?

Re: 
<https://learn.netdata.cloud/docs/data-collection/apm/application-monitoring>,

root@mowa219-gjp4-8570p-freebsd:~ # grep apps.plugin 
/usr/local/etc/netdata/apps_groups.conf
# apps.plugin process grouping
# The apps.plugin displays charts with information about the processes 
running.
# If you enter even just one *name* (substring), apps.plugin will process
# (although applications started after apps.plugin is started, will be 
appended
apps.plugin: apps.plugin
root@mowa219-gjp4-8570p-freebsd:~ #