.deb Package repo cannot be resolved

$ sudo apt update
Err:1 http://apt.pm2.io/ubuntu stable InRelease
  Could not resolve 'apt.pm2.io'
Hit:2 https://dl.yarnpkg.com/debian stable InRelease
Hit:3 http://mirrors.digitalocean.com/ubuntu focal InRelease
Hit:4 http://mirrors.digitalocean.com/ubuntu focal-updates InRelease
Hit:5 https://repos.insights.digitalocean.com/apt/do-agent main InRelease
Hit:6 https://repos-droplet.digitalocean.com/apt/droplet-agent main InRelease
Hit:7 https://deb.nodesource.com/node_14.x focal InRelease
Hit:8 http://mirrors.digitalocean.com/ubuntu focal-backports InRelease
Hit:9 http://security.ubuntu.com/ubuntu focal-security InRelease
Reading package lists... Done
Building dependency tree
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://apt.pm2.io/ubuntu/dists/stable/InRelease  Could not resolve 'apt.pm2.io'
W: Some index files failed to download. They have been ignored, or old ones used instead.

Environment:

NAME="Ubuntu"
VERSION="20.04.3 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.3 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

pm2-hive / pm2-hive.github.io

.deb Package repo cannot be resolved #230