One of the things I have been wanting to monitor on top of our publicly available services such as HTTP, SSH, and FTP is the cpu load and other metrics of our servers.
The problem I ran into while trying to configure the nrpe plugin before I compiled it was "configure: error: Cannot find ssl headers". I had been looking into this problem for a day or so before I found the simple solution.
yum install openssl-devel
After I ran the above command and installed it's dependencies I was able to configure and then complie the nrpe plug in per the guild I was following.
Now I just need to get the nrpe plugin installed on all of my servers!