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In 256 support for cgroup v1 ('legacy' and 'hybrid' hierarchies) is now considered obsolete and systemd by default will refuse to boot under it.
To forcibly reenable cgroup v1 support, you can set boot.kernelParams = [ "systemd.unified_cgroup_hierachy=0" "SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1" ].
To forcibly reenable cgroup v1 support, you can set boot.kernelParams = [ "systemd.unified_cgroup_hierarchy=0" "SYSTEMD_CGROUP_ENABLE_LEGACY_FORCE=1" ].
NixOS does not officially support this configuration and might cause your system to be unbootable in future versions. You are on your own.