/etc/network/if-down.d/upstart is in ifupdown 0.7~beta2ubuntu8.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
set -e
initctl emit -n net-device-down \
"IFACE=$IFACE" \
"LOGICAL=$LOGICAL" \
"ADDRFAM=$ADDRFAM" \
"METHOD=$METHOD"
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