Incoming news regarding OpenSSH in 
etc.:apt-listchanges: News
openssh (1:10.1p1-1) UNRELEASED; urgency=medium
OpenSSH 10.1p1 includes a number of changes that may affect existing configurations:
- ssh(1): add a warning when the connection negotiates a non-post quantum key agreement algorithm.
This warning has been added due to the risk of "store now, decrypt later" attacks. More details at https://openssh.com/pq.html
This warning may be controlled via a new WarnWeakCrypto ssh_config option, defaulting to on. This option is likely to control additional weak crypto warnings in the future.