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Mirror release file expired

On apt-get update, I see:

Reading package lists... Done
E: Release file for
http://mirror.cc.columbia.edu/debian/dists/buster/InRelease is expired
(invalid since 17h 5min 48s). Updates for this repository will not be

What's the best way to communicate this to the folks who manage that
particular mirror -- the Columbia one?


Boyan Penkov