Adding upgrade messaging for PK migrations

Merged Craig Gomes requested to merge craig-gomes-master-patch-13964 into master

What does this MR do?

In high traffic or large self-managed instances, some of the PK migrations could encounter a deadlock or lock timeout. This entry highlights the migrations that could trigger these errors or take a long time.

Screenshots or Screencasts (strongly suggested)

How to setup and validate locally (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

Does this MR contain changes to processing or storing of credentials or tokens, authorization and authentication methods or other items described in the security review guidelines? If not, then delete this Security section.

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team