Nagios with Munin services gives unknown - nagios

Question

On an Debian Wheezy updated server, I'm using the backports of the following packages :
Nagios : nagios3 (3.4.1-5~bpo7+1)
Munin : munin (2.0.25-1~bpo70+1)
And nsca (2.9.1-2) to trasmit data from Munin to Nagios in order to process alerts.
Nagios is working fine with the following configured Munin services :
# generic service template definition
define service{
name generic-munin-service ; The 'name' of this service template
use generic-service
check_command return-unknown!"No Data from passive check"
active_checks_enabled 0 ; Active service checks are disabled
passive_checks_enabled 1
parallelize_check 1
notifications_enabled 1
event_handler_enabled 1
is_volatile 1
notification_interval 120
notification_period 24x7
notification_options w,u,c,r
check_freshness 1
freshness_threshold 360
flap_detection_options n
max_check_attempts 2
register 0 ; DONT REGISTER THIS DEFINITION - ITS NOT A REAL SERVICE, JUST A TEMPLATE!
;first_notification_delay 6 ; Delay first notification for false positives (will execute 2 checks : munin sends 1 check every 5 minutes)
}
define service {
hostgroup_name munin
service_description Disk latency per device :: Average latency for /dev/sda
use generic-munin-service
notification_interval 0 ; set > 0 if you want to be renotified
}
define service {
service_description Disk latency per device :: Average latency for /dev/sdb
use generic-munin-service
notification_interval 0 ; set > 0 if you want to be renotified
}
define service {
hostgroup_name munin
service_description Disk usage in percent
use generic-munin-service
notification_interval 0 ; set > 0 if you want to be renotified
}
define service {
hostgroup_name munin
service_description Inode usage in percent
use generic-munin-service
notification_interval 0 ; set > 0 if you want to be renotified
}
define service {
hostgroup_name munin
service_description File table usage
use generic-munin-service
notification_interval 0 ; set > 0 if you want to be renotified
}
But when I add further services which are available on all monitored hosts too, they will be labelled as UNKNOWN in Nagios:
define service {
hostgroup_name munin
service_description Memory usage
use generic-munin-service
notification_interval 0 ; set > 0 if you want to be renotified
}
define service {
hostgroup_name munin
service_description CPU usage
use generic-munin-service
notification_interval 0 ; set > 0 if you want to be renotified
}
I've already found out that depending on the munin plugin graph title format, Nagios may not understand the incoming data, that's why I've updated the packages on the server to the backports version of Wheezy, since Munin 2.0.7 should clean all titles.
I also tried to debug with a higher debug level, and the log shows :
[1434122043] SERVICE ALERT: HostIJZI4;Memory usage;UNKNOWN;HARD;2;INCONNU
But I may need your help for going further.

Answer 1

I suggest you to update your packages, Nagios Core is currently in 4.1.1 and you are using an older version.
They fixed a lot of things, maybe your issue is now patched : https://www.nagios.org/projects/nagios-core/history/4x/