An updated version of Open Monitoring Distribution (OMD) is available at the Bananian site here. They’ve build it for the ARMv7 (BananaPi, Raspberry Pi 2 & 3, OrangePi).
I’ve written a complete install manual for version 1.00 which should work for version 1.30 too. Just make sure you use Raspbian Jessie.
The related Check_mk_agent files can be found at their download location too, http://dl.bananian.org/software/omd/.
To install check_mk_agent on a raspberry pi you type the following commands from a home directory:
sudo dpkg -i check-mk-agent_1.2.6p12-1~bpo8+1_armhf.deb