net-mgmt/icinga2 + net-mgmt/monitoring-plugins: check_snmp not working

[O. Hartmann]

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Using net-mgmt/icinga2 and net-mgmt/monitoring-plugins for observation of some
swithces and routers via check_snmp fails lately with the error on all systems
with a

CRITICAL - Plugin timed out while executing system call

Even those examples taken from the handbook do not work on FreeBSD CURRENT and
FreeBSD 10.1-p6 (systems and ports tree uptodate to the most recent sources).

I tried the command "check_snmp" manually as well as the snmpget (implicitely
installed from port net-mgmt/net-snmp) and they work well.

I suspect that the plugin is missing some variables (community, version, oid or
even host address), which are not passed properly by ICINGA2 to the plugin or
the handbook of icinga2 claims they're set but in reality they aren't.

I need some hints how to debug the call of a specific plugin and what that
plugin is provided with (variables) from ICINGA2. I only found some debugging
hints and features for ICINGA2 itself, but they do not help much since the logs
do not reveal the calling  of the plugin.

Can someone help with some hints?

Thanks in adavance,

Oliver
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