Some old distributions that are EOL will be moving to
https://apt-archive.postgresql.org:
jessie-pgdg
wheezy-pgdg
eoan-pgdg
disco-pgdg
trusty-pgdg
precise-pgdg
To allow systems still using these distributions to upgrade smoothly,
the repository files will stay on apt.postgresql.org until the end of
March 2021; the files are already available on apt-archive. No updates
will be provided for these anymore.
Christoph