I couldn't find a support forum for nagiosgraph. I just posted a question there as well in connection with this problem.
I'll see if someone there can assist me.
Hello, I've installed Nagios Core 4.2.2 and Nagiosgraph 1.5.2 on CentOS 7.0 64bit. Both Nagios Core and Nagiosgraph was installed from source. The check-host-alive graph isn't updating for any hosts. The RRD files gets created for every host and gets updated continually but nothing shows on the grap...