Thanks @bryce for the detailed updates.

For us personally its the second time we run into a docker daemon
restart on production (including all container restarts).

The only reason why this time it got much more attention is that a bug
prevented a clean restart of the daemon, leaving containers offline.

This fact tells us that most of the people never noticed that their
containers were also during the last update restartet. (Which is fine
because mostly a short restart, for example of a webserver nobody would
notice)

This is also fine of most of our servers because they running
lightweight containers.

The only reason why we noticed it (this and last time) is that we
running heavy database containers (for example elasticsearch with couple
of TBs) which have a restart time of minutes instead of seconds.

Especially its critical (and loosing consistency) when containers of the
same kind get restarted at the same time.

All of this chain is triggered by the unattended updates. Thats why we
excluded the automatic updates for the docker package.

But this doesnt help if depending package updates still restarting the
docker daemon/containers.

Since the unattended package is still marked as 'wont-fix', and the
dependencies problem is explained above..

The only way to safely prevent docker daemon restarts is to fully
disable the whole unattended updates? Can someone confirm this?

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https://bugs.launchpad.net/bugs/1906364

Title:
  unattended-upgrade still restarts blacklisted daemons

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