/etc/apt/apt.conf.d/50whatmaps_apt is in whatmaps 0.0.9-1+deb8u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | DPkg::Pre-Install-Pkgs { "/usr/bin/whatmaps --apt --restart --print-cmds=/var/lib/whatmaps/restart.sh || true" };
DPkg::Post-Invoke { "if [ -x /var/lib/whatmaps/restart.sh ]; then /var/lib/whatmaps/restart.sh; rm -f /var/lib/whatmaps/restart.sh; fi" };
DPkg::Tools::Options::/usr/bin/whatmaps::Version "2";
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