The stretch 9.1 point release brings a number of bugfixes (including minor security fixes): https://lists.debian.org/debian-announce/2017/msg0005.html
Use this ticket to track the respective updates across the cluster.
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None of the packages removed for 9.1 were present in our environment.
These are fully rolled out:
adwaita-icon-theme
apt
c-ares
phpunit
pulseaudio