/etc/ppp/ip-down.d/0stunnel4 is in stunnel4 3:5.44-1ubuntu3.
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
# if this script gets called, we assume that the machine has lost
# IPv4 connectivity -> restart stunnel (do not stop it, it is possible
# to have a eth connection)
test -f /etc/default/stunnel4 && . /etc/default/stunnel4
test "$PPP_RESTART" != "0" || exit 0
invoke-rc.d stunnel4 restart
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