I'm glad to announce an update on mirror for Zabbix repository for Ubuntu, Debian and Raspbian.
New 4.4 release is here!
For Ubuntu, trusty, xenial and bionic distributions are managed.
For Debian, stretch and buster distributions are managed.

Available architectures are i386 and amd64 for Debian and Ubuntu distributions.

For Raspbian, stretch and buster distributions are managed.

You can add this mirror in /etc/apt/sources.list.d/zabbix.list.
Example for 4.4 and Debian buster:

deb https://zabbix-mirror.fredprod.com/zabbix/4.4/debian buster main

Keyserver is: keyserver.ubuntu.com
Keyid: 1DFF230644068194

You can add gpg key:

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1DFF230644068194