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Question about jessie


just a quick question about Jessie.

In recent days, the directories jessie-backports and jessie-updates have been removed from the main repositories.
jessie-backports is now available on the site "archive" and jessie-updates has totally disappeared.
The jessie distribution is supposed to be in LTS until 2020.
What is the reason for these directory movements? Is this normal?
In addition, the directory jessie-backports is indicated as expired (InRelease).

Thank you in advance for the information you can provide me about it.