Comment 4 for bug 1641931

@vkhlyunev, the link you've provided is for the upstream Fuel version where update to the latest Mitaka is _not mandatory_ (unless I miss smth).

As for MOS, the Quickstart guide [0] contains the update step (#4) as a mandatory one.

BUT, since the update procedure for _existing_envs_ [1] contains a warning (step 5) about customizations' loss, I am not sure whether we can make this procedure _mandatory_ (unless we rephrase the warning).

@vsedelnik, @dmeltsaykin, could you please comment on this?

[0] https://docs.mirantis.com/openstack/fuel/fuel-9.1/quickstart-guide/qs-install-scripts-procedure.html

[1] https://docs.mirantis.com/openstack/fuel/fuel-9.1/release-notes/update-product/update-env-9-9-1.html