Steps to reproduce:
rpm -Uvh https://repo.zabbix.com/zabbix/4.0/rhel/7/x86_64/zabbix-release-4.0-2.el7.noarch.rpm

Result:
zabbix-non-supported | 951 B 00:00
zabbix-non-supported/primary | 1.6 kB 00:00
zabbix-non-supported 4/4
No package zabbix available.
Resolving Dependencies
--> Running transaction check
---> Package zabbix-agent.x86_64 0:4.0.19-1.el7 will be installed
--> Processing Dependency: libc.so.6(GLIBC_2.17)(64bit) for package: zabbix-agent-4.0.19-1.el7.x86_64
--> Processing Dependency: systemd for package: zabbix-agent-4.0.19-1.el7.x86_64
--> Processing Dependency: systemd for package: zabbix-agent-4.0.19-1.el7.x86_64
--> Processing Dependency: libpcre.so.1()(64bit) for package: zabbix-agent-4.0.19-1.el7.x86_64
--> Finished Dependency Resolution
Error: Package: zabbix-agent-4.0.19-1.el7.x86_64 (zabbix)
Requires: systemd
Error: Package: zabbix-agent-4.0.19-1.el7.x86_64 (zabbix)
Requires: libpcre.so.1()(64bit)
Error: Package: zabbix-agent-4.0.19-1.el7.x86_64 (zabbix)
Requires: libc.so.6(GLIBC_2.17)(64bit)
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest