Add 16-9 zero downtime notes
Ref: #428989 (closed)
What does this MR do and why?
This MR adds note for %16.9 as it can possibly break self-managed installations that do zero-downtime deployments.
Why are we doing this?
As the routing table was created in the same release with post deployment migrations, the application will not be able to see the the table until the post deployment migrations are executed.
Edited by Max Orefice