/lib/udev/rules.d/70-spice-vdagentd.rules is in spice-vdagent 0.17.0-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | ACTION=="add", SUBSYSTEM=="virtio-ports", ENV{DEVLINKS}=="/dev/virtio-ports/com.redhat.spice.0", ENV{SYSTEMD_WANTS}="spice-vdagentd.target"
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