Goal: 

• As a writer, I want to create a draft of a new overcloud adoption and upgrade prepare procedure for multi-cell environments. I started a draft here:  Performing the overcloud adoption and preparation for multi-cell environments 
• The following feedback must also be incorporated from a related[ task|https://issues.redhat.com/browse/OSPRH-20321] must also be incorporated:
  • In https://docs.redhat.com/en/documentation/red_hat_openstack_platform/17.1/html-single/framework_for_upgrades_16.2_to_17.1/index#overcloud-adoption-for-multi-cell-environments_overcloud-adoption Section 8.2.3 I would change text to:

By running noop ansible forcing the necessary data to be generated into stack's overcloud-deploy directory for cell export.

source ~/stackrc
openstack overcloud upgrade run --yes --limit allovercloud,undercloud --stack overcloud --playbook overcloud/upgrade_steps_playbook.yaml --skip-tags upgrade_steps

Reexport overcloud stack to get updated file to be used in overcloud upgrade prepare:

openstack overcloud cell export --control-plane-stack overcloud --force-overwrite --working-dir overcloud-deploy/overcloud --output-file overcloud-deploy/overcloud/overcloud-cell-export.yaml

Acceptance Criteria:

• Draft of procedure includes all necessary multi-cell steps, including the workarounds above.
• Draft is sent to relevant SMEs for review.