For the Debian package repository:
# cat /etc/apt/sources.list.d/grafana.list
deb [arch=amd64 signed-by=/etc/apt/trusted.gpg.d/grafana.gpg] https://apt.grafana.com stable main
apt update
works:
# apt update
Hit:1 https://apt.grafana.com stable InRelease
...
But:
# apt install grafana
Err:1 https://apt.grafana.com stable/main amd64 grafana amd64 10.4.1
404 Not Found [IP: 151.101.30.217 443]
E: Failed to fetch https://apt.grafana.com/pool/main/g/grafana/grafana_10.4.1_amd64.deb 404 Not Found [IP: 151.101.30.217 443]
Browsing to any of the following URL results in “Sorry, the requested url was not found”:
Although there’s something valid at https://apt.grafana.com