libuv-devel is not available in epel8 which is now a dependency for netdata
*** This bug has been marked as a duplicate of bug 1759510 ***
Well, you can find the libuv-devel rpm package with the correct version following this link provided by redhat.com officially: http://downloads.redhat.com/redhat/rhel/rhel-8-beta/appstream/x86_64/Packages/libuv-1.23.1-1.el8.x86_64.rpm
sorry, the link should be http://downloads.redhat.com/redhat/rhel/rhel-8-beta/appstream/x86_64/Packages/libuv-devel-1.23.1-1.el8.x86_64.rpm