`preflight` Yaml key is missing in the doc

[flovntp]

Where on docs.platform.sh should be changed?

https://docs.upsun.com/create-apps/app-reference/single-runtime-image.html#primary-application-properties

What exactly should be updated?

from the Yaml schema validator, it seems that we've got a possible applications.app.preflight config, but there is no mention in the doc (P.sh or Upsun).
What to do with it?

Additional context

No response

[flovntp]

It exists on gitlab side, waiting for engineering to explain that for adding a page in the doc

[gilzow]

@flovntp is this different from, or related to pre_start ?
https://docs.platform.sh/create-apps/app-reference/single-runtime-image.html#web-commands