It might have sense to include in 20.03 upgraded versions of
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libvirt(to matchqemuversion - libvirt is too old for qemu in unstable · Issue #81102 · NixOS/nixpkgs · GitHub) -
collectd(to match updatedlibvirtlibvirt: 5.4.0 -> 6.1.0 by wedens · Pull Request #81161 · NixOS/nixpkgs · GitHub), anywaycollectdin20.03is very old (from Oct 2018) for such a software with tons of sensor plugins for various software