Clarification on PGDG Package Policies Across Platforms

Dear PostgreSQL Team,

I hope you are doing well.

I am currently using PostgreSQL 17 on Ubuntu 22.04 (Jammy). I noticed that
the system_stats extension is available as an RPM package in the PGDG
repository for RHEL 9, but I could not find a corresponding Debian/Ubuntu
(.deb) package in the PGDG APT repository.

I would like clarification not only about this specific extension, but also
about the general packaging policy followed by PostgreSQL.org/PGDG across
different operating systems.

In particular:

-

If a package or extension is available in one PGDG repository (for
example, RHEL), is it generally expected to be available for other
supported platforms like Ubuntu as well?
-

Are there technical, policy, maintenance, or demand-related reasons why
some packages are built only for specific distributions?
-

Is there any documented guideline that explains how packaging decisions
are made across platforms?

I would appreciate your clarification on both the specific case of
system_stats and the broader packaging policy.

Thank you for your time and support.

Best regards,
Sreekanta Reddy