How much traffic will NAGIOS monitoring tool add?

[netappmagic]

We have OCUM and PM monitoring tools with 15mins polling. Now on top of theses we also added Nagios in 10 mins. So, can it add too much read traffic onto CDOT filer? Or what benefits will we have by using this 3rd party tool?
Thanks!

[netappmagic]

Update:

I have started to see the following ERROS's after NAGIOS got enabled. Can anybody please tell me if this ERROR should be ignored? or what impact is gonig to be on the storage. To me ERROR is ERROR, it should have negative impact, but, just could not tell what impact is.

ERROR         snmp.server.busy: SNMP daemon is busy serving a high rate of incoming SNMP queries.