I am unable to find any release packages for Ubuntu 21.10 (Impish Indri),

I added the repo via the netxms-release package, and when updating my packages it returns the following;

Ign:5 http://packages.netxms.org/ubuntu impish InRelease
Err:6 http://packages.netxms.org/ubuntu impish Release
  404  Not Found [IP: 5.9.112.213 80]
Reading package lists... Done
E: The repository 'http://packages.netxms.org/ubuntu impish Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

Did I mess something up, or is there no release packages?

I did look into the URL, http://packages.netxms.org/ubuntu, and I don't see any for Impish Indri, just Bionic, Focal and Xenial.