Per https://www.drupal.org/node/2281691#comment-10338513, we should have an initial page which is the first thing an administrator sees at /upgrade. We'll take the update.php first page as a model:

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mikeryan created an issue. See original summary.

  • mikeryan committed aaf65dc on 8.x-1.x 
    Issue #2570523 by mikeryan: Add an initial overview page to begin the...
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mikeryan
he/him
Primary language English
Location Pittsfield, MA, USA
commented
Status: Active » Fixed

Done, with an initial draft of the text. Refining the text for UX will be a good Barcelona sprint task, opening up a followup issue.

Status: Fixed » Closed (fixed)

Automatically closed - issue fixed for 2 weeks with no activity.