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/etc/apt/apt.conf.d/99needrestart is in needrestart 2.11-3+deb9u1.

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# needrestart - Restart daemons after library updates.
#
# Call needrestart after package upgrades/installations and check
# for pending service restarts. Should only be triggered if there
# was no error during installation.
#

DPkg::Post-Invoke {"test -x /usr/lib/needrestart/apt-pinvoke && /usr/lib/needrestart/apt-pinvoke || true"; };