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Incident report
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    Resolution: Fixed
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Minor
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    2.4.2
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    Red Hat Enterprise Linux Server 7.0 (Maipo) 3.10.0-123.el7.x86_64
 
The file used by Zabbix to get the OS name, /etc/issue.net according to the documentation, has changed in RHEL7.
It seems that this information has moved to /etc/os-release (http://www.freedesktop.org/software/systemd/man/os-release.html) in distributions that use systemd.
I have attached two patches that fix this issue. It's probably not the best implementation, but you can use it if you're too busy to fix it anytime soon.