apt update command and now see something new.
Get:1 http://deb.debian.org/debian buster InRelease [122 kB] Get:2 http://security.debian.org/debian-security buster/updates InRelease [65.4 kB] Get:3 http://deb.debian.org/debian buster-updates InRelease [51.9 kB] Get:4 http://security.debian.org/debian-security buster/updates/main Sources [199 kB] Get:5 http://security.debian.org/debian-security buster/updates/main amd64 Packages [302 kB] Get:6 http://security.debian.org/debian-security buster/updates/main Translation-en [158 kB] Fetched 898 kB in 2s (547 kB/s) Reading package lists... Done Building dependency tree Reading state information... Done 2 packages can be upgraded. Run 'apt list --upgradable' to see them. N: Repository 'http://deb.debian.org/debian buster InRelease' changed its 'Suite' value from 'stable' to 'oldstable' N: Repository 'http://security.debian.org/debian-security buster/updates InRelease' changed its 'Suite' value from 'stable' to 'oldstable' N: Repository 'http://deb.debian.org/debian buster-updates InRelease' changed its 'Suite' value from 'stable-updates' to 'oldstable-updates'
buster-updates InRelease' changed its 'Suite' value from 'stable-updates' to 'oldstable-updates' it means? Did someone hacked my system or it is done by Debian on its own?