Nagios charm does not add default host checks to nagios

Adding relation i get i the logs:

2016-07-22 13:33:21 INFO monitors-relation-changed Ignoring check_disk_root_sub due to unknown family nrpe
2016-07-22 13:33:21 INFO monitors-relation-changed Ignoring check_zombie_procs_sub due to unknown family nrpe
2016-07-22 13:33:21 INFO monitors-relation-changed Ignoring check_mem_sub due to unknown family nrpe
2016-07-22 13:33:21 INFO monitors-relation-changed Ignoring check_swap_sub due to unknown family nrpe
2016-07-22 13:33:21 INFO monitors-relation-changed Ignoring check_load_sub due to unknown family nrpe
2016-07-22 13:33:21 INFO monitors-relation-changed Ignoring check_users_sub due to unknown family nrpe
2016-07-22 13:33:21 INFO monitors-relation-changed Ignoring check_total_procs_sub due to unknown family nrpe
2016-07-22 13:33:21 INFO monitors-relation-changed Ignoring check_disk_root_sub due to unknown family nrpe
2016-07-22 13:33:21 INFO monitors-relation-changed Ignoring check_zombie_procs_sub due to unknown family nrpe

Nrpe plugin is installed and all looks ok. This is all installed via automated juju deployment.

When new relation is added, script charm/hooks/monitors-relation-changed is called. In the end, there is a for loop where it does add services to nagios - lines 118 to 126. And from there this line comes.

Upon further investigation, this loop calls in customize_service, which for NRPE calls customize_nrpe in charm/hooks/common.py. There is check that "extra" argument must have array with "command" element - and if this is not true, false is returned.

And, this is the problem, since for default commands, "extra" just contains command - and not array. Changing common.py in line 175 from "return False" to "cmd_args.extend(('-c', extra))" fixes this problem for me. I'm not sure if this will break something else, so maybe proper fix is needed.

Regards,

H.